Fernblock®: the ingredient that makes Heliocare 360° different

Most sunscreens compete on SPF number and texture. Heliocare competes on something harder to copy: Fernblock®, a patented antioxidant found in every single product in the Heliocare 360° range. It is the reason dermatologists reach for this brand specifically, and it is worth understanding properly if you are trying to work out whether a premium sunscreen is actually worth the price difference over a high-street one.

What is Fernblock®?

Fernblock® is a standardised extract of Polypodium leucotomos, a fern native to Central and South America. Originally an aquatic plant, it evolved over millions of years to survive on land, developing potent natural defences against solar radiation and environmental stress. Cantabria Labs, the pharmaceutical-dermatology company behind Heliocare, isolated and standardised those defences into Fernblock®.

 The extract itself is not new. Indigenous communities in Central America have used Polypodium leucotomos for skin conditions for centuries, and its anti-inflammatory and photoprotective properties were first studied scientifically in the 1960s. What is more recent is the level of clinical rigour behind it: Fernblock® technology was developed through research by Cantabria Labs in collaboration with Dr Thomas Fitzpatrick's team at Harvard Medical School, and it is now backed by more than 80 clinical studies and scientific publications, making it one of the most extensively researched botanical actives in dermatology.

How Fernblock® actually works

Unstable molecules called reactive oxygen species (ROS) are generated when skin is exposed to UV radiation, visible light, and infrared A. Left unchecked, these free radicals damage the structures that keep skin firm and even — collagen, elastin, and the DNA inside skin cells — which ultimately drives sunburn, pigmentation and premature ageing.

 Fernblock® works on several fronts at once. It is a powerful antioxidant, neutralising free radicals before they can do any damage. Research published in peer-reviewed dermatology journals has shown that it inhibits the release of ROS triggered by UV exposure, helps protect skin's own antioxidant enzyme systems, and supports the repair of UV-induced DNA damage — repair that studies suggest continues to matter for hours after sun exposure has ended. It has also been shown to help protect the skin's immune defences, which UV radiation otherwise suppresses, and to reduce the abnormal breakdown of collagen and elastin associated with photoageing.

 Put simply: whereas a standard sunscreen filter blocks UV rays from penetrating the skin, Fernblock® works alongside that filter to manage the damage that gets through regardless, and to help skin recover from it.

What the clinical evidence actually shows

This is where Fernblock® distinguishes itself from most "hero ingredients" in skincare marketing. Multiple peer-reviewed studies have found that Fernblock® measurably increases the skin's resistance to UV radiation, effectively enhancing the protective effect of the SPF and UVA filters with which it is combined. Clinical research has also explored its role in specific pigmentary conditions — for example, a placebo-controlled study on melasma found significantly greater improvement in disease severity among patients using oral Polypodium leucotomos extract alongside their existing treatment, compared with placebo.

It has also been studied as a complementary option in dermatology-led management of photodermatoses (sun-triggered skin reactions) and photoaggravated inflammatory conditions, and as an adjuvant to treatment for actinic keratosis. It is worth being precise here: Fernblock® is a well-evidenced antioxidant and photoprotective ingredient, not a medical treatment in its own right. Any specific skin condition should always be managed by a dermatologist rather than by sunscreen choice alone.

Why this makes Fernblock® a genuine differentiator

Many sunscreens list vitamin C or vitamin E on the back of the tube as an antioxidant selling point, and both are genuinely useful. What sets Fernblock® apart is the sheer depth of clinical research behind it, its dual mode of action — it works both topically, applied directly to the skin, and orally, taken as a supplement — and the fact that it has been studied specifically against the full spectrum of daylight damage, not just UVB.

That oral-and-topical duality is unusual. Most skincare actives work only from the outside in. Fernblock® is one of the few ingredients with a credible evidence base for working from both directions at once, which is why Heliocare positions its capsules as a genuine complement to topical SPF rather than a gimmick supplement — although, as with any sunscreen, the capsules are designed to work alongside daily topical protection, never instead of it.

Fernblock® across the Heliocare 360° range

Every formula in the range contains Fernblock®, whether that is the Oil-Free Gel built for oily and combination skin, the Pigment Solution Fluid formulated for sun-induced pigmentation, or the calming A-R Emulsion for redness-prone skin. And our personal favourite Age Active Fluid for skin experiencing fine lines, wrinkles and photo-ageing. The concentration and supporting actives vary depending on the concern each product is designed to address, but the Fernblock® foundation remains consistent across all of them.

If you are still deciding which formula suits your skin, our guide to which Heliocare 360° SPF is right for your skin type breaks down the full range in detail.