Central American fern extract with STRONG evidence as an oral sunscreen supplement. Fernblock® (480mg before sun exposure) reduced sunburn by 63% and UV-induced DNA damage by 84%. The mechanism: PLE's antioxidants and anti-inflammatory compounds are distributed to skin after oral absorption, providing systemic photoprotection. Used by dermatologists as adjunct for sun-sensitive skin conditions (polymorphous light eruption, vitiligo). Does NOT replace topical sunscreen but adds an 'internal SPF layer.' Dose: 240-480mg 30 min before sun exposure. --- *Reviewed by the Dose AI Research Team and Clinical Advisory Board* *Last updated: 2026-04-06*
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.