The Skin Longevity Glossary

The science of outdoor exposure, photoprotection, recovery, and long-term skin health.

SUI WASSER is pioneering a new branch of skincare focused on Skin Longevity for people who live their lives in the outdoors.

That means looking beyond traditional skincare—and beyond what happens before exposure—to better understand what happens to our skin during and after a lifetime spent in the sun, wind, cold, heat, dry air, altitude, salt, sweat, chlorine, and other environmental stresses.

The science is evolving quickly. Researchers are expanding our understanding of oxidative stress, biological photoprotection, the skin exposome, barrier disruption and recovery, inflammation, intrinsic defense systems, and even biological processes that can continue after UV exposure has ended.

As we follow this research, we believe it’s important to share what we’re learning.

The Skin Longevity Library is our growing collection of the scientific terms, concepts, ingredients, mechanisms, and research shaping how we think about outdoor skincare. We’ve created it to translate complex science into understandable language—and to explain why certain areas of research have captured our attention.

We don’t pretend to have all the answers. In many cases, we’re following the same questions researchers are still working to answer.

But one question sits at the center of everything we’re doing:

What can we do to better support our skin over a lifetime spent in the outdoors?

That’s the question behind SUI WASSER—and the reason we’re building this Library.

“We don’t pretend to have all the answers.” The Skin Longevity Library is our growing collection of the scientific terms, concepts, ingredients, mechanisms, and research shaping how we think about outdoor skincare. So as we learn, you can too.

Featured Skin Longevity Terms & Concepts

About Skin Longevity Terms & Concepts

As we explore the emerging science of Skin Longevity, you’ll encounter terminology that may be familiar—and some that probably isn’t.

We’ve created this growing reference to make that science easier to understand. Below you’ll find important terms and concepts related to environmental exposure, photoprotection, oxidative stress, skin biology, recovery, and long-term skin health—along with a straightforward definition and why each matters to the work we’re doing at SUI WASSER.

Use the A–Z guide below to explore the Library.

Last Updated: September 21, 2026

Skin Longevity Library — Science & Ingredients
Last updated: October 13, 2026. Ingredient entries describe ingredient properties and formulation interests, not clinical claims for finished products.

Term Definition Why It Matters

A

Antioxidants
Science
DefinitionCompounds that can interact with oxidants and help regulate oxidative reactions. Antioxidants participate in the body's systems for managing reactive molecules.
Why It MattersAntioxidant strategy already plays an important role in SUI WASSER formulation and is a major area of biological photoprotection research.Back to A–Z ↑
Arnica
Ingredient
DefinitionA botanical ingredient derived from Arnica species, commonly used in topical preparations. It contains compounds such as sesquiterpene lactones.
Why It MattersRelevant to SUI WASSER’s Trail Recovery+ formulation and ongoing interest in topical comfort after outdoor activity.Back to A–Z ↑
Avocado Oil
Ingredient
DefinitionAn emollient plant oil rich in oleic acid and other fatty acids, used to soften and condition skin.
Why It MattersA potential cost-conscious formulation oil under evaluation; suitability depends on stability, skin feel, and the finished formula.Back to A–Z ↑

B

Beeswax
Ingredient
DefinitionA natural wax used to thicken oil-based balms and form a protective, water-resistant film on the skin.
Why It MattersHelps determine balm structure, application feel, and resistance to environmental conditions.Back to A–Z ↑
Biological Photoprotection
Science
DefinitionAn approach to photoprotection that focuses on supporting or influencing the skin's biological defenses and responses to solar radiation, rather than relying solely on filtering or blocking incoming UV radiation.
Why It MattersCentral to SUI WASSER's research direction because it expands photoprotection beyond blocking exposure and toward understanding the skin's biological response to exposure.Back to A–Z ↑
Bisabolol
Ingredient
DefinitionA naturally occurring or manufactured cosmetic ingredient used for its skin-conditioning and soothing properties.
Why It MattersIncluded in SUI WASSER formulation work as a skin-comfort ingredient, especially for skin stressed by outdoor conditions.Back to A–Z ↑

C

Carotenoids Science + Ingredient
Naturally occurring pigments produced by plants and other organisms. Carotenoids—including beta-carotene, lutein, lycopene, and related compounds—can function as antioxidants and help interact with reactive oxygen species and other forms of oxidative stress.
Carotenoids are relevant to SUI WASSER’s Skin Longevity research because the skin is continually exposed to environmental sources of oxidative stress. Certain botanical oils naturally contribute carotenoids alongside fatty acids, phytosterols, tocopherols, and other compounds—adding another layer of chemical diversity to a formulation. Back to A–Z ↑
Calendula (Marigold) Extract
Ingredient
DefinitionA botanical extract made from Calendula officinalis flowers; its composition depends on the extraction method and carrier.
Why It MattersA candidate under investigation for future skin-conditioning formulations; extract type and carrier oil matter.Back to A–Z ↑
Chemiexcitation
Science
DefinitionA process in which a chemical reaction creates an electronically excited molecule without requiring that molecule to directly absorb light. It has been implicated in formation of dark CPDs after UV exposure.
Why It MattersChemiexcitation provides a mechanism that helps explain how certain molecular effects can continue after someone is no longer in the sun.Back to A–Z ↑
Coenzyme Q10 (CoQ10)
Ingredient
DefinitionA lipid-soluble molecule, also called ubiquinone, involved in mitochondrial electron transport and antioxidant processes.
Why It MattersAn antioxidant ingredient in SUI WASSER’s formulation strategy and a useful link between skin biology and post-exposure research.Back to A–Z ↑
Collagen
Science
DefinitionA family of structural proteins that provides strength and support to skin and other connective tissues.
Why It MattersCollagen changes are a major feature of photoaging and provide one connection between cumulative environmental exposure and long-term skin structure.Back to A–Z ↑
Cutaneous Homeostasis
Science
DefinitionThe skin's ability to maintain a stable, functional biological environment despite continual internal and external stresses. It involves coordinated regulation of barrier function, hydration, immune activity, inflammation, cellular turnover, and repair.
Why It MattersThis concept closely reflects the Skin Longevity objective: understanding how skin maintains function over decades of repeated environmental exposure.Back to A–Z ↑
Cyclobutane Pyrimidine Dimers (CPDs)
Science
DefinitionA specific type of UV-induced DNA lesion formed when neighboring pyrimidine bases in DNA become abnormally bonded. CPDs are commonly used as a marker of UV-induced DNA damage.
Why It MattersCPDs are an important research endpoint for understanding UV-induced damage and evaluating experimental photoprotection or post-exposure interventions.Back to A–Z ↑

D

Dark CPDs
Science
DefinitionCPDs that form after UV exposure has ended through biochemical reactions rather than continued exposure to ultraviolet radiation.
Why It MattersTheir existence demonstrates that some UV-initiated molecular processes can continue after exposure ends, making them especially relevant to SUI WASSER's interest in the post-exposure period.Back to A–Z ↑
DNA Photolesions
Science
DefinitionDamage to DNA caused by exposure to light, particularly ultraviolet radiation. Several different types of photolesions can form following UV exposure.
Why It MattersThese lesions are measurable biological consequences of UV exposure and help define research endpoints for studying exposure and recovery.Back to A–Z ↑
DNA Repair
Science
DefinitionThe collection of cellular mechanisms that recognize and correct damage to DNA. Different repair pathways address different forms of DNA damage.
Why It MattersUnderstanding normal DNA-repair biology is important to post-exposure research, while claims that a cosmetic product repairs DNA require specific supporting evidence.Back to A–Z ↑
Dragon’s Blood Extract
Ingredient
DefinitionA common name for red plant resins or extracts from several botanical sources; composition varies substantially by species and extraction process.
Why It MattersRelevant to SUI WASSER’s Dragon’s Blood Recovery Gel; accurate botanical identity and extract composition are essential.Back to A–Z ↑

E

Elastin
Science
DefinitionA structural protein that helps tissues stretch and return toward their original shape.
Why It MattersChanges in elastin and its organization are associated with chronically sun-exposed skin and are relevant to the structural side of Skin Longevity.Back to A–Z ↑
Enzymes Science
Biological molecules, primarily proteins, that accelerate and regulate chemical reactions within living cells and tissues. In skin, enzymes participate in processes including antioxidant defense, lipid metabolism, barrier maintenance, cellular renewal, and DNA repair.
Enzymes are important to Skin Longevity because many of the skin’s protective and recovery processes depend on properly functioning enzymatic systems. Environmental stress and aging can influence these systems, making enzymes an important part of understanding how skin maintains homeostasis, responds to damage, and supports its own repair. Back to A–Z ↑
Erythema
Science
DefinitionVisible redness of the skin caused by increased blood flow and inflammatory responses. UV-induced erythema is commonly recognized as sunburn.
Why It MattersErythema is a useful visible and measurable exposure endpoint, but its absence does not mean that no photodamage occurred.Back to A–Z ↑
Eucalyptus Essential Oil
Ingredient
DefinitionAn aromatic essential oil containing volatile compounds such as 1,8-cineole; composition varies by species and source.
Why It MattersUsed in Trail Recovery+ for its sensory character; essential oils also require attention to skin sensitivity.Back to A–Z ↑
Extracellular Matrix (ECM)
Science
DefinitionThe structural network surrounding cells that helps organize and support tissue. In skin it includes collagen, elastin, glycoproteins, and other components.
Why It MattersThe ECM is central to long-term skin structure and is affected by pathways associated with UV exposure, oxidative stress, and photoaging.Back to A–Z ↑

F

Fibroblasts
Science
DefinitionCells found primarily in the dermis that produce and maintain components of the extracellular matrix, including collagen and other structural proteins.
Why It MattersFibroblast health and signaling are important to long-term skin structure and are commonly studied in photoaging and recovery research.Back to A–Z ↑
Fatty Acids
Science + Ingredient
DefinitionOrganic molecules that are fundamental components of many skin lipids and botanical oils. Different fatty acids—including linoleic, oleic, alpha-linolenic, and punicic acids—have different chemical structures and functions.
Why It MattersFatty-acid diversity is central to SUI WASSER’s formulation philosophy. Different botanical oils provide different fatty-acid profiles, allowing formulations to combine complementary lipids rather than relying on a single oil or “hero” ingredient.Back to A–Z ↑
Ferulic Acid
Science + Ingredient
DefinitionA plant-derived phenolic compound with antioxidant properties. Ferulic acid occurs naturally in the cell walls of many plants and has been studied extensively in topical antioxidant formulations.
Why It MattersFerulic acid is particularly interesting to SUI WASSER because research has demonstrated that it can improve the stability and photoprotective performance of certain vitamin C and vitamin E antioxidant systems. Its compatibility with SUI WASSER’s predominantly oil-based formulations requires further investigation.Back to A–Z ↑
Free Fatty Acids
Science
DefinitionFatty acids that are not chemically bound within larger lipid molecules such as triglycerides. Free fatty acids are among the lipid components involved in the organization and function of the skin’s outer barrier.
Why It MattersFree fatty acids help explain why skin-barrier health is about more than simply adding oil to the skin. The composition, organization, and balance of skin lipids—including fatty acids, cholesterol, and ceramides—contribute to normal barrier function.Back to A–Z ↑
Free Radicals
Science
DefinitionAtoms or molecules containing an unpaired electron, making them highly reactive. Some free radicals can participate in oxidative chain reactions that affect cellular components.
Why It MattersUnderstanding free-radical chemistry helps explain why antioxidant systems are relevant to environmental skin stress while avoiding oversimplified 'all free radicals are bad' messaging.Back to A–Z ↑

I

Immunomodulation
Science
DefinitionThe regulation or modification of immune-system activity. Depending on biological context, this can involve increasing, decreasing, or otherwise altering an immune response.
Why It MattersSome biological photoprotective ingredients are studied for immunomodulatory effects, making this an important mechanism to understand when reviewing ingredient research.Back to A–Z ↑
Inflammatory Cascade
Science
DefinitionA sequence of interconnected cellular signals that initiates and amplifies inflammation following injury, irritation, infection, or environmental stress such as UV exposure.
Why It MattersInflammatory signaling can continue beyond the initiating exposure and is relevant to understanding stressed skin and the post-exposure period.Back to A–Z ↑
Intrinsic Defense Systems
Science
DefinitionThe skin's naturally occurring mechanisms for protecting itself and responding to stress, including antioxidant defenses, immune activity, pigmentation, barrier function, and DNA-repair processes.
Why It MattersSkin Longevity is partly about understanding these endogenous systems and investigating how skincare can responsibly support the conditions in which they function.Back to A–Z ↑

J

Jojoba Oil
Ingredient
DefinitionA liquid wax ester derived from jojoba seeds, valued in skincare for its emollient properties and oxidative stability.
Why It MattersA premium skin-conditioning ingredient in SUI WASSER formulations; cost and substitution efficiency are important in future reformulation.Back to A–Z ↑

K

Keratinocytes
Science
DefinitionThe predominant cells of the epidermis. They produce keratin and participate in barrier formation, immune signaling, inflammation, and responses to environmental stress.
Why It MattersKeratinocytes are directly exposed to many environmental stresses and frequently appear in studies evaluating UV response, oxidative stress, and topical ingredients.Back to A–Z ↑

L

Lipid Peroxidation
Science
DefinitionOxidative damage to lipids caused by reactive molecules. Because lipids are important components of cell membranes and the skin barrier, lipid peroxidation can affect cellular and barrier function.
Why It MattersThis connects oxidative stress directly with lipid biology, making it particularly relevant to SUI WASSER's interest in lipid-rich and antioxidant formulation strategies.Back to A–Z ↑
Linoleic Acid Science + Ingredient
An essential omega-6 polyunsaturated fatty acid found in many botanical oils. Linoleic acid is an important component of skin lipids and contributes to the formation and maintenance of the skin’s protective barrier.
Linoleic acid is particularly relevant to SUI WASSER’s Skin Longevity research because healthy barrier function depends in part on an appropriate balance of skin lipids. Botanical oils such as Oat Oil, Rosehip Oil, Pumpkin Seed Oil, and Sunflower Oil can contribute linoleic acid as part of a broader and more diverse fatty-acid profile. Back to A–Z ↑

M

Matrix Metalloproteinases (MMPs)
Science
DefinitionA family of enzymes involved in breaking down and remodeling components of the extracellular matrix. Increased activity of certain MMPs following UV exposure is associated with degradation of collagen and other structural proteins.
Why It MattersMMPs help connect repeated environmental exposure with changes in the skin's structural matrix and long-term photoaging.Back to A–Z ↑
Meadowfoam Seed Oil
Ingredient
DefinitionA plant-derived oil with long-chain fatty acids that contribute to its relatively high oxidative stability.
Why It MattersUsed to improve skin feel and support emollient performance; SUI WASSER is reviewing its cost relative to alternatives.Back to A–Z ↑
Melanin
Science
DefinitionA group of pigments produced by melanocytes that contribute to skin, hair, and eye color and absorb portions of ultraviolet and visible radiation.
Why It MattersMelanin is part of the skin's natural photoprotective system and is also involved in emerging research concerning post-exposure dark CPD formation.Back to A–Z ↑
Melanogenesis
Science
DefinitionThe biological process through which melanocytes produce melanin.
Why It MattersMelanogenesis is relevant to pigmentation responses following exposure and to research on biological photoprotection and visible-light effects.Back to A–Z ↑

N

NAD+
Science
DefinitionNicotinamide adenine dinucleotide is a coenzyme involved in cellular energy metabolism, redox reactions, signaling, and processes required for normal cellular maintenance and DNA repair.
Why It MattersNAD+ is one reason nicotinamide is interesting to SUI WASSER's research: cellular recovery and repair processes require energy and metabolic resources.Back to A–Z ↑
Nicotinamide / Niacinamide
Science
DefinitionA form of vitamin B3 involved in cellular metabolism and the production of NAD+. It has been studied in skin biology for effects related to barrier function, cellular energy, inflammation, and UV-associated responses.
Why It MattersIt is a promising candidate for future SUI WASSER research, particularly if we develop water-containing formulations capable of delivering water-soluble actives.Back to A–Z ↑

O

Oat Oil
Ingredient
DefinitionAn oat-derived lipid ingredient containing fatty acids and minor lipid components; composition varies by supplier.
Why It MattersRecently added to SUI WASSER’s ingredient inventory for evaluation in Trail Recovery+ and barrier-focused formulations.Back to A–Z ↑
Oxidative Stress
Science
DefinitionA biological state in which production of reactive molecules exceeds the body's ability to adequately control or neutralize them, potentially affecting lipids, proteins, DNA, and other cellular structures.
Why It MattersEnvironmental exposure can contribute to oxidative stress, making it a major area of interest in understanding cumulative outdoor skin stress and post-exposure biology.Back to A–Z ↑
Oleic Acid Science + Ingredient
A monounsaturated omega-9 fatty acid found naturally in many botanical oils. Oleic acid contributes to the emollient properties of oils and can influence how they spread, soften, and interact with the skin.
Oleic acid is relevant to SUI WASSER because botanical oils are selected not simply by name, but by their overall lipid composition. Understanding the balance between oleic acid, linoleic acid, and other fatty acids helps us evaluate how different oils may contribute to the feel, conditioning properties, and overall lipid diversity of a formulation. Back to A–Z ↑

P

Photoaging
Science
DefinitionLong-term changes in the skin caused or accelerated by repeated exposure to solar radiation, including changes in pigmentation, collagen, elastin, texture, and other skin structures.
Why It MattersPhotoaging is directly relevant to Skin Longevity because cumulative exposure is a defining feature of a life spent in the outdoors.Back to A–Z ↑
Photodamage
Science
DefinitionMolecular, cellular, and structural changes or damage associated with exposure to light, particularly ultraviolet radiation. Photodamage can occur without visible sunburn.
Why It MattersIt reinforces an important distinction for outdoor skincare: absence of a visible burn does not mean that exposure had no biological effect.Back to A–Z ↑
Photoimmunosuppression
Science
DefinitionThe alteration or suppression of immune activity in the skin caused by exposure to ultraviolet radiation.
Why It MattersIt demonstrates that UV exposure can affect biological systems beyond visible redness and photoaging, broadening the Skin Longevity research framework.Back to A–Z ↑
Photolyase
Science
DefinitionA light-activated DNA-repair enzyme found in many organisms but not naturally produced by humans. It can directly reverse certain UV-induced CPDs through photoreactivation.
Why It MattersPhotolyase is scientifically interesting because it represents a direct DNA-lesion repair strategy being investigated in topical photoprotection, although formulation, delivery, and claims require careful evaluation.Back to A–Z ↑
Phytosterols
Science + Ingredient
DefinitionNaturally occurring plant compounds structurally similar to cholesterol, an important component of the skin’s lipid barrier. Phytosterols are found in many botanical oils and are valued in skincare for their skin-conditioning, soothing, and barrier-supporting properties.
Why It MattersPhytosterols are particularly interesting to SUI WASSER’s Skin Longevity research because maintaining a healthy lipid environment becomes increasingly important as skin ages and faces repeated environmental exposure. Botanical oils such as Oat Oil and Pumpkin Seed Oil can contribute phytosterols as part of a broader, diverse lipid profile.Back to A–Z ↑
PINGs — Non-Filtering Photoprotective Ingredients
Science
DefinitionIngredients investigated for biological photoprotective effects without primarily working as UV filters. Proposed mechanisms include antioxidant, anti-inflammatory, immunomodulatory, pigmentation, and DNA-related pathways.
Why It MattersPING research may help identify ingredients for future SUI WASSER formulations that complement conventional sun protection without attempting to replace sunscreen.Back to A–Z ↑
Pomegranate Seed Oil
Ingredient
DefinitionAn oil pressed from pomegranate seeds, notable for its content of punicic acid, a conjugated fatty acid.
Why It MattersBeing evaluated for selective inclusion in SUI WASSER facial and recovery balms; ingredient-level research does not establish finished-product outcomes.Back to A–Z ↑
Post-Exposure Recovery
Science
DefinitionThe period and biological processes following environmental exposure during which the skin responds to stress, restores barrier function and homeostasis, and carries out normal cellular maintenance and repair.
Why It MattersThis is a central SUI WASSER research interest: understanding what continues after exposure and how skincare can responsibly support healthy skin during that period.Back to A–Z ↑
Punicic Acid Science + Ingredient
A conjugated polyunsaturated fatty acid found in particularly high concentrations in pomegranate seed oil. Often described as an omega-5 fatty acid, punicic acid is one of the compounds that gives pomegranate seed oil its distinctive fatty-acid profile.
Punicic acid is of interest to SUI WASSER because it illustrates why ingredient diversity matters. Pomegranate Seed Oil contributes a very different lipid profile than many commonly used botanical oils, allowing it to complement oils richer in linoleic, oleic, and other fatty acids within a thoughtfully designed formulation. Back to A–Z ↑
Proteins Science
Complex biological molecules built from amino acids that perform structural, signaling, transport, catalytic, and protective functions throughout the body. In skin, proteins include structural components such as collagen, elastin, and keratin, as well as enzymes and other molecules involved in cellular function and tissue maintenance.
Proteins are fundamental to Skin Longevity because they contribute to the skin’s structure, strength, elasticity, renewal, and biological response systems. Aging and environmental exposure can affect important skin proteins and the processes that maintain them, making protein health an important part of understanding how skin changes throughout life. Back to A–Z ↑

R

Reactive Oxygen Species (ROS)
Science
DefinitionHighly reactive oxygen-containing molecules produced naturally by cells and in response to environmental stresses such as UV radiation. Excessive ROS can contribute to oxidative stress.
Why It MattersROS provide a specific biological pathway for investigating antioxidant strategies and the effects of environmental exposure on skin.Back to A–Z ↑
Redox Homeostasis
Science
DefinitionThe biological balance between oxidative processes and the antioxidant systems that regulate reactive molecules. Maintaining this balance is important for normal cellular function.
Why It MattersThis is a more precise framework than simply trying to eliminate free radicals; Skin Longevity is interested in supporting healthy biological balance.Back to A–Z ↑
Rosehip Oil
Ingredient
DefinitionAn emollient oil from rosehip seeds that typically contains linoleic and alpha-linolenic fatty acids.
Why It MattersBeing considered for Après Sport, Recovery+, and Alpin-Glow, with attention to oxidative stability and formulation cost.Back to A–Z ↑
Rosemary Essential Oil
Ingredient
DefinitionAn aromatic essential oil containing volatile terpenes; its composition varies with botanical source and processing.
Why It MattersPart of Trail Recovery+ sensory formulation, with concentration and potential irritation important to evaluate.Back to A–Z ↑

S

Sea Buckthorn Berry Oil
Ingredient
DefinitionA deeply colored botanical oil from sea buckthorn berries containing fatty acids, carotenoids, and other constituents.
Why It MattersA component of Trail Recovery+ formulation work, contributing skin-conditioning lipids and characteristic color.Back to A–Z ↑
Skin Barrier
Science
DefinitionThe skin's outer protective system, particularly the stratum corneum, which helps limit water loss and protects underlying tissue from the external environment.
Why It MattersBarrier support is already central to SUI WASSER's post-exposure approach and connects directly with hydration, comfort, resilience, and recovery.Back to A–Z ↑
Skin Exposome
Science
DefinitionThe collection of environmental and lifestyle exposures that affect the skin throughout a person's lifetime, including sunlight, pollution, temperature, humidity, climate, and other external influences.
Why It MattersClosely matches SUI WASSER's focus on cumulative exposure to sun, wind, cold, heat, dry air, altitude, salt, sweat, chlorine, and other stresses encountered through outdoor life.Back to A–Z ↑
Soy Wax
Ingredient
DefinitionA hydrogenated soybean-derived wax used to structure balm and other wax-based products.
Why It MattersProvides another lever for adjusting firmness, melting behavior, and formulation economics.Back to A–Z ↑
Squalane
Ingredient
DefinitionA stable, saturated hydrocarbon emollient used to soften skin and reduce the feeling of dryness.
Why It MattersA central skin-conditioning ingredient in Recovery+ and a useful example of lipid-based barrier-support formulation.Back to A–Z ↑
Stratum Corneum
Science
DefinitionThe outermost layer of the epidermis, composed largely of corneocytes embedded in a lipid matrix. It forms a major part of the skin's barrier.
Why It MattersIt is the interface between the body and the outdoor environment and therefore central to barrier-focused post-exposure skincare.Back to A–Z ↑
Sunflower Oil
Ingredient
DefinitionAn emollient oil pressed from sunflower seeds; its fatty-acid profile varies by cultivar and grade.
Why It MattersUsed as a carrier oil, including for Arnica infusion, and relevant to balancing ingredient cost and performance.Back to A–Z ↑

T

Tetrahexyldecyl Ascorbate (THDA)
Ingredient
DefinitionAn oil-soluble vitamin C derivative used in cosmetic formulations; it differs chemically and in evidence base from pure L-ascorbic acid.
Why It MattersA premium ingredient reserved for SUI WASSER’s Recovery+ and Alpin-Glow formulation work.Back to A–Z ↑
Transepidermal Water Loss (TEWL)
Science
DefinitionThe passive movement of water through the skin and into the surrounding environment. Elevated TEWL can be an indicator of impaired barrier function.
Why It MattersTEWL provides a measurable endpoint for barrier condition and could be useful in future testing of post-exposure formulations.Back to A–Z ↑

U

UVA
Science
DefinitionUltraviolet A radiation, approximately 315–400 nm, which penetrates more deeply into skin than UVB and contributes substantially to oxidative stress, photoaging, and other biological effects.
Why It MattersUVA broadens the outdoor-skin conversation beyond sunburn and is particularly relevant to oxidative and long-term structural effects.Back to A–Z ↑
UVA1
Science
DefinitionThe longer-wavelength portion of UVA, approximately 340–400 nm, capable of penetrating relatively deeply into skin.
Why It MattersUVA1 is increasingly studied for biological effects that are not captured by a narrow focus on UVB or sunburn.Back to A–Z ↑
UVB
Science
DefinitionUltraviolet B radiation, approximately 280–315 nm, which is strongly absorbed in the epidermis and is a major cause of sunburn and direct UV-induced DNA damage.
Why It MattersUVB is one component of solar exposure and an essential part of understanding how different wavelengths affect skin.Back to A–Z ↑

V

Visible Light
Science
DefinitionThe portion of electromagnetic radiation visible to the human eye, roughly 400–700 nm. Visible light can also produce biological effects in skin, including effects on pigmentation in some skin types.
Why It MattersIt reinforces the idea that the skin's environmental light exposure extends beyond the wavelengths traditionally associated with sunburn.Back to A–Z ↑
Vitamin C (Ascorbic Acid & Derivatives) Science + Ingredient
Vitamin C is an essential antioxidant involved in numerous biological processes, including collagen synthesis and antioxidant defense. In skincare, “Vitamin C” can refer to L-ascorbic acid—the biologically active form of vitamin C—or to a variety of chemically modified derivatives designed to alter properties such as stability, solubility, skin delivery, and formulation compatibility. These forms are related, but they are not chemically or functionally interchangeable.
Vitamin C is particularly relevant to Skin Longevity because it participates in both antioxidant defense and collagen synthesis. As an antioxidant, ascorbic acid can interact with reactive oxygen species and can also participate in antioxidant networks with compounds such as vitamin E.

The specific form matters considerably in skincare. L-ascorbic acid is water-soluble and biologically active but can be difficult to formulate because it is sensitive to oxidation and formulation conditions. Vitamin C derivatives modify the molecule to improve characteristics such as stability or compatibility, but those changes can also affect how the ingredient behaves and how readily it becomes biologically available.

SUI WASSER currently works with Tetrahexyldecyl Ascorbate (THDA), an oil-soluble vitamin C derivative that is particularly compatible with anhydrous oil-and-wax formulations. For SUI WASSER, understanding the form, concentration, stability, delivery system, and interaction of vitamin C with other antioxidants is more meaningful than simply stating that a formulation “contains Vitamin C.” Back to A–Z ↑
Vitamin E (Tocopherols and Tocopheryl Esters)
Ingredient
DefinitionVitamin E is not a single molecule but a family of eight naturally occurring, fat-soluble compounds: alpha-, beta-, gamma-, and delta-tocopherol and alpha-, beta-, gamma-, and delta-tocotrienol. These forms differ in molecular structure, biological activity, antioxidant behavior, and distribution in nature. Skincare formulations may also use vitamin E derivatives such as tocopheryl acetate, which are chemically modified for greater stability but do not behave identically to free tocopherols.
Why It MattersVitamin E is particularly relevant to skin because it is lipid-soluble and therefore operates within lipid-rich environments, including cell membranes and the skin’s outer lipid structures. Tocopherols can help interrupt lipid oxidation by reacting with lipid-derived free radicals, making vitamin E part of the skin’s antioxidant defense network rather than simply another generic “vitamin.”

The specific form matters. Alpha-, gamma-, and other tocopherols and tocotrienols have different chemical and biological properties, while esterified forms such as tocopheryl acetate generally offer greater formulation stability but different immediate antioxidant behavior.

This means that seeing “Vitamin E” on an ingredient list does not, by itself, describe exactly what form is present or what role it is performing.

For SUI WASSER, vitamin E is especially interesting because Skin Longevity involves both antioxidant defense and preservation of the skin’s lipid environment.

Understanding the form, concentration, stability, and interaction of vitamin E with other antioxidants and botanical lipids is therefore more useful than treating vitamin E as a single interchangeable ingredient.Back to A–Z ↑