Antioxidants have become a familiar part of the skincare conversation. They help defend the skin against oxidative stress—the imbalance created when reactive molecules, commonly known as free radicals, exceed the skin’s natural ability to neutralise them.

These reactive molecules can be generated by everyday exposure to UV radiation, pollution and other environmental stressors. Left unchecked, oxidative stress can affect proteins, collagen and cellular lipids, contributing to visible changes such as dullness, uneven tone, loss of firmness and premature skin ageing.

But not all antioxidants behave in the same way.

Some are water-soluble. Others are lipophilic, meaning they are compatible with oils and fats. This distinction influences where an antioxidant can operate, how it interacts with the skin and what it may help protect.

First, what does lipophilic mean?

“Lipophilic” literally means fat-loving.

A lipophilic—or oil-soluble—antioxidant is attracted to lipid-rich environments. These include the natural oils on the skin’s surface, the intercellular lipids that help hold the skin barrier together and the lipid membranes surrounding our cells.

Water-soluble antioxidants, by comparison, are most active in aqueous or water-based environments.

This distinction matters because skin is not made from one uniform substance. It contains both water- and lipid-based structures, and oxidative stress can occur across both.

How do water-soluble antioxidants work?

Water-soluble antioxidants operate primarily in aqueous environments, where they can help neutralise reactive molecules before those molecules cause further damage.

The best-known example is L-ascorbic acid, the biologically active form of Vitamin C. It is a hydrophilic—or water-loving—molecule with well-established antioxidant properties.

Vitamin C also plays important roles in collagen synthesis and the regulation of melanin production, making it a widely used ingredient for supporting firmness, luminosity and more even-looking skin.

However, water solubility can create formulation challenges. The outermost layer of the skin is naturally lipid-rich, which can limit the penetration of a charged, water-soluble molecule such as L-ascorbic acid. It is also inherently unstable and can oxidise when exposed to light, air or unsuitable pH conditions. Research published in The Journal of Clinical and Aesthetic Dermatology explores these benefits and formulation considerations in detail.

This does not make water-soluble antioxidants ineffective. It simply means their stability, concentration, delivery system and surrounding formula matter.

How are lipophilic antioxidants different?

Lipophilic antioxidants are compatible with oils and can position themselves within lipid-rich areas of the skin.

This allows them to help defend the lipids that form part of the skin barrier and cell membranes against lipid peroxidation—a chain reaction in which free radicals damage lipids and compromise their structure.

Vitamin E is one of the most familiar oil-soluble antioxidants. Its location within cellular membranes allows it to help interrupt oxidative reactions in the lipid phase. Scientific research describes Vitamin E’s role in protecting cell membranes from oxidative stress, although—as with any antioxidant—its performance depends on the formula and context in which it is used. Read the research.

Lipophilic antioxidants can be particularly valuable in skincare designed to support:

• The skin barrier

• Lipid integrity

• Dry or depleted skin

• Resilience against environmental stress

• The visible signs of oxidative ageing

Meet Bioactive Totarol™

Bioactive Totarol™ is TWYG’s hero lipophilic antioxidant, derived from the heartwood of New Zealand’s ancient Tōtara tree.

The Tōtara evolved natural defence mechanisms that allowed it to endure for centuries in a demanding environment. One of these protective compounds is Totarol—a rare aromatic diterpenoid studied for its potent antioxidant, anti-inflammatory and selective antimicrobial properties.

As a lipophilic molecule, Bioactive Totarol™ has an affinity for the lipid-rich structures within the skin. Research examining its interaction with phospholipid membranes suggests Totarol positions itself near the membrane interface, where it can interact with both the lipid environment and surrounding aqueous phase. View the published study.

This positioning is significant. Oxidative stress does not only occur in the watery spaces around cells. It can also attack the lipids forming cellular membranes and the skin barrier itself.

Bioactive Totarol™ helps provide antioxidant defence where conventional water-soluble antioxidants may be less naturally at home.

In antioxidant testing, Bioactive Totarol™ demonstrated seven times the antioxidant potency of Vitamin E—bringing powerful lipid-phase protection to every TWYG formula.

Is one type of antioxidant better?

Not necessarily.

Lipophilic and water-soluble antioxidants work in different environments, and the skin benefits from protection across both. The stronger question is not which category is best, but whether a formula provides stable, well-delivered antioxidant support in the places it is needed.

In fact, antioxidants can work as an interconnected network.

Vitamin C and Vitamin E provide a well-studied example. Vitamin E helps interrupt oxidative reactions within lipid membranes, while water-soluble Vitamin C can help regenerate oxidised Vitamin E so it can continue performing its protective role. Research has demonstrated this complementary relationship.

This is why thoughtfully combining antioxidants can be more valuable than relying on one molecule in isolation.

Why TWYG uses oil-soluble Vitamin C

Alongside Bioactive Totarol™, TWYG formulas use Tetrahexyldecyl Ascorbate—also known as VC-IP—an oil-soluble derivative of Vitamin C.

Traditional L-ascorbic acid is water-soluble and can be sensitive to air, light and pH. Tetrahexyldecyl Ascorbate is formulated for compatibility with the skin’s lipid environment and offers greater stability within oil-based and emulsion formulas.

This allows TWYG to combine multiple lipophilic antioxidants within a complementary delivery environment:

• Bioactive Totarol™ helps defend lipid structures from oxidative stress while supporting calm, balanced-looking skin.

• Tetrahexyldecyl Ascorbate provides a stable, oil-compatible form of Vitamin C to support antioxidant defence and more even-looking skin.

• Vitamin E helps protect lipids from oxidation and contributes to the formula’s wider antioxidant network.

• Bakuchiol provides additional antioxidant support while helping refine the appearance of texture and visible signs of ageing.

Rather than adding antioxidants simply to create a longer ingredient list, TWYG considers their solubility, stability and relationship with the skin.

Antioxidant skincare is about location—not just potency

A laboratory measurement of antioxidant strength tells only part of the story.

For an antioxidant to perform effectively in skincare, it must remain stable within the formula, reach a relevant area of the skin and interact with the environment it is intended to protect.

Water-soluble antioxidants help provide defence within aqueous environments. Lipophilic antioxidants help protect lipid-rich structures. Used intelligently, they can create a broader and more complementary system of support.

This is the principle behind TWYG’s approach: not simply adding more actives, but selecting bioactives that work in meaningful ways within the skin.

Because when it comes to antioxidants, where they work can be just as important as how powerful they are.