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Polypodium leucotomos (Fernblock)
An oral fern extract (Fernblock) with antioxidant/photoprotective effects — randomized trials show it adds to sunscreen for photoprotection and accelerates melasma improvement. An ADJUNCT to sunscreen, not a replacement.
What the evidence says
Most Polypodium Leucotomos studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 2014–2023 with a typical study size of 131 participants.
Based on 4 studies · 2 RCTs · 171 total participants
Confidence
LowBy outcome
Polypodium Leucotomos has an evidence score of 4.5/10 — emerging evidence based on 4 indexed studies. An oral fern extract (Fernblock) with antioxidant/photoprotective effects — randomized trials show it adds to sunscreen for photoprotection and accelerates melasma improvement. An ADJUNCT to sunscreen, not a replacement. Representative study: PMID 36892441.
The commonly studied dose of Polypodium Leucotomos is 240-480mg oral Polypodium leucotomos extract daily (often split, dosed before sun exposure). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
See full supplement plans that include Polypodium Leucotomos.
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Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Polypodium leucotomos is a tropical fern whose leaf extract (Fernblock) has antioxidant and anti-inflammatory effects that reduce UV-induced skin damage from the inside. Randomized trials show oral PLE improves photoprotection on top of topical sunscreen and accelerates melasma improvement when combined with hydroquinone and SPF50. It's also used adjunctively for photodermatoses (e.g. polymorphic light eruption) and vitiligo. Evidence is mostly small trials, and — critically — it is an ADJUNCT to sun protection, not a substitute for sunscreen or sun avoidance. Generally well tolerated.
Scavenges UV-induced reactive oxygen species, reducing DNA/skin damage.
Reduces UV-induced inflammatory mediators and pigment changes.
How Polypodium Leucotomos works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
240-480mg oral Polypodium leucotomos extract daily (often split, dosed before sun exposure)
Take with food
| Form | Type |
|---|---|
| 💊Polypodium leucotomos extract (Fernblock) | Recommended |
| 💊Capsule | Alternative |
Adjunct to sunscreen.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Morning / before sun exposure.
Dose-response data unavailable. The current published research for Polypodium Leucotomos does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Reduces UV-induced skin damage on top of sunscreen.
Accelerates melasma response with topical therapy.
Limited data — use only if advised.
Keep using sunscreen — PLE is an adjunct, not a replacement.
No significant documented drug interactions.
Tip: Take with food
Tip: Reduce dose
The best time to take Polypodium Leucotomos is in the morning. Taking it with food is preferred. Often taken in the morning and/or before sun exposure; consistency matters for pigment goals.
Polypodium Leucotomos is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are mild GI upset, itching/headache. Use caution if any of these apply to you: Allergy to ferns; Pregnancy/breastfeeding (limited data).
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