Polypodium leucotomos: The inside-out ingredient your skin routine will love

In the hot and humid rainforests of Central and South America, when the sunlight breaks through, it's relentless.  And yet, here lives a fern that has thrived. 

It has been evolving for millions of years, living under skies that deliver some of the harshest and most intense UV radiation on Earth. To survive, this remarkable plant naturally developed a rich array of powerful polyphenolic compounds and antioxidants that help to protect its feather-like leaves and stems from environmental stress.

That fern is Polypodium leucotomos. And its journey from the rainforest to the pages of peer-reviewed dermatology journals is, in many ways, a beautiful example of what happens when ancient wisdom and modern science finally catch up with each other.

Here, our nutritionist explores what Polypodium leucotomos is and why we've chosen it as an ingredient in True Skin Alchemy, our ingestible ritual to help protect skin from modern stresses.

Polypodium leucotomos: Ancient roots

Long before researchers isolated its compounds and understood its chemistry, Polypodium was part of the herbal traditions of indigenous communities across Central and South America and the Caribbean coast. Indigenous communities historically ingested the fern, often brewed as a tea, to help with various inflammatory, immune-related disorders and skin conditions such as psoriasis, vitiligo and the type of chronic inflammation that sits beneath the surface.

While the mechanisms were not yet understood, over the course of the centuries, the plant became part of a rich tradition of botanical knowledge that would later attract scientific interest.

The science of Polypodium leucotomos explained 

The protective nature of Polypodium leucotomos is rooted in its polyphenol content, particularly compounds called caffeic acid and ferulic acid, which function as potent antioxidants. When ingested, these compounds are absorbed and reach the skin via the bloodstream, where they support the skin's capacity to manage oxidative stress, a process by which free radicals found in the environment cause damage to our cells and tissues.

The protection Polypodium leucotomos offers is different from anything topical. Sunscreen plays its role by working at the surface, intercepting UV before it penetrates. Polypodium leucotomos works from within, supporting the skin's own defences against the damage that UV exposure sets in motion: the free radical damage, the inflammation that follows and the slow loss of structural components such as collagen and elastin. 

But don’t just take our word for it. The research on Polypodium leucotomos is compelling, with studies demonstrating reductions in UV-induced skin damage and a meaningful effect on the skin's capacity to handle environmental exposure (1).

Beyond the antioxidant action, research has shown that Polypodium leucotomos may also support the regulation of enzymes involved in collagen degradation - meaning its role extends into helping preserve the skin's structural integrity under environmental stressors. 

This inside-out approach is what makes Polypodium leucotomos particularly interesting. Skin is not isolated from the rest of the body; every skin cell is supplied by nutrients, antioxidants and signalling molecules delivered through circulation. As a result, the factors that influence skin health extend far beyond what we apply topically and include the nutrients and compounds we consume, too.

Why we use Polypodium leucotomos in True Skin Alchemy

That brings us to why  Polypodium leucotomos was selected as one of seven synergised ingredients in True Skin Alchemy.

At Ancient + Brave, we’re drawn to ingredients that sit at the intersection of traditional wisdom and modern scientific understanding. Polypodium leucotomos sits at that intersection as a plant with deep roots in traditional botanical medicine, whose mechanism is now studied in research, and crucially whose mechanism of action aligns with how we understand skin health to work: as a part of the system, from within and over time.

True Skin Alchemy is designed with the understanding of skin as a system, and within the formula, Polypodium sits at the heart of the ‘Protect’ layer. It works alongside vitamin C and grape seed extract to provide the antioxidant and photoprotective support that helps defend the skin's hydration, barrier and structural integrity. 

As a B-Corporation supplement brand, we source it with the same care we bring to every ingredient: traceable and third-party tested for purity. 

“Polypodium leucotomos carries this ancient intelligence into a daily ritual, helping the skin respond to environmental stress from within.” Jo Woodhurst Director of Nutrition and Education at Ancient + Brave.

Who can benefit from Polypodium Leucotomos? Skin types and life stages 

Polypodium leucotomos is particularly well suited to anyone whose skin is under consistent environmental pressure - those who travel frequently, spend time outdoors, or live in urban environments where pollution, blue light from screens, and UV combine into a daily cumulative load.

Polypodium Leucotomos may also benefit women of menopausal age whose own antioxidant capacity has started to soften. From the mid-thirties onwards, the body produces less of its own protective compounds. The skin becomes more susceptible to the cumulative effects of oxidative damage that show up years later as reduced resilience. 

Pregnancy and breastfeeding are times when we take extra care with everything we put into our bodies, and because there isn't yet enough reliable research on Polypodium leucotomos during these stages, we'd recommend leaving it out for now and checking in with your practitioner.

How to make Polypodium Leucotomos part of your ritual 

Like most things worth doing, Polypodium Leucotomo works best with consistency.  Its effects begin at a cellular level, supporting the skin long before visible changes emerge. The research points to meaningful effects building over four to eight weeks of daily use, with benefits continuing to accumulate over time. Take it daily, as part of a morning ritual. Pair it with the rest of your skin support, your hydration, your time outdoors, even your collagen ritual. Think of it as ingestible skin care - working beneath the surface alongside the daily rituals that help your skin thrive. 

Closing thoughts: Sun, skin and the bigger picture

The science around UV exposure and skin health is in an interesting place right now. The picture is more complex than it once seemed; we, after all, evolved with the sun too, and so there is genuine research exploring the physiological value of moderate, considered and careful sun exposure beyond UV rays: vitamin D synthesis, circadian rhythm support, the kind of light spectrum our immune and nervous systems have relied on for as long as humans have existed.

At the same time, chronic unprotected overexposure carries risks that are well evidenced. Both things are true. What is becoming clearer is that supporting skin from within as well as externally, its own antioxidant resilience, its structural capacity, and its ability to handle cumulative environmental load, is part of a more complete, intelligent approach to skin health. 

That's the role Polypodium leucotomos plays within True Skin Alchemy -  and it's just one part of the story. Discover the power of our intelligent inside-out skin support supplement here or head over to our next journal, The origins, science and results behind True Skin Alchemy to find out more about ingredients working alongside Polypodium leucotomos and the thought process behind the formula.

Frequently asked questions

What is Polypodium leucotomos used for? 

Polypodium leucotomos is primarily for internal antioxidant and photoprotective support,  helping the skin manage oxidative stress from UV and environmental exposure. It has also been used traditionally and in clinical research for skin health and is only meaningfully available through supplementation.

What does Polypodium leucotomos do for skin? 

It helps the skin manage oxidative stress from UV and environmental exposure, supports antioxidant defence, and may help protect the skin's structural integrity over time.

Is it the same as sunscreen? 

No. Sunscreen works at the skin's surface. Polypodium leucotomos works systemically, supporting the skin's own cellular defences. They do different things and complement each other well.  And to be clear: Polypodium leucotomos is not a reason to be reckless in the sun. It is a complementary layer of support that works best alongside sensible sun habits and appropriate topical protection.

Can you take Polypodium leucotomos every day? 

Yes. Like many nutritional interventions, the benefits are most likely to emerge with consistent daily use. 

How long does it take to work?

 Most research on Polypodium leucotomos points to meaningful effects developing over four to eight weeks of consistent use. That timeline is supported by our own clinical trial on True Skin Alchemy,  the finished formula that Polypodium leucotomos sits within, which showed objective improvements in hydration, elasticity, firmness, fine lines, and barrier function at the eight-week interim point. 

Is it Polypodium leucotomos  safe? 

The safety profile in the research literature is strong. A 60-day clinical trial found 240mg twice daily to be safe and well tolerated (2). Always consult a practitioner if pregnant, breastfeeding, or managing a health condition. 

Currently, there isn't enough reliable information to know whether Polypodium leucotomos is safe during pregnancy or breastfeeding, so it's best to avoid it and check with your healthcare practitioner.

• (https://onlinelibrary.wiley.com/doi/10.1111/ijd.12611) 

• (https://pmc.ncbi.nlm.nih.gov/articles/PMC4345929/)