Sunburn

Taken orally, standardized Polypodium leucotomos extract (Fernblock/Anapsos) raises the minimal erythema dose and blunts UV-induced erythema, sunburn-cell formation and phototoxic reactions in controlled human studies, with recent randomized placebo-controlled work reporting modest MED gains over 8 weeks ^{8,9,10Reference 8González et al. · 1997RCTTopical or oral administration with an extract of Polypodium leucotomos prevents acute sunburn and psoralen-induced phototoxic reactions — randomisedView study →Reference 9Kohli et al. · 2017Clinical trialThe impact of oral Polypodium leucotomos extract on ultraviolet B response: a human clinical studyView study →Reference 10Keršmanc et al. · 2025RCTEffects of eight-week supplementation containing red orange and Polypodium leucotomos extracts on UV response — randomised double-blind placebo-controlledView study →}. This is systemic prevention, not after-sun treatment, and the effect is real but small — an adjunct to, never a substitute for, topical sunscreen; all human data are on proprietary standardized extracts, not raw fern or tea.

Two RCTs found 12 weeks of high-flavanol cocoa raised the minimal erythema dose (more UV needed to redden skin), but a third well-controlled parallel RCT at a comparable flavanol dose found no effect, so the evidence is split ^{2,3,4Reference 2Heinrich U et al. · 2006RCTLong-term ingestion of high-flavanol cocoa provides photoprotection against UV-induced erythema and improves skin condition in women — randomised controlled trialView study →Reference 3Williams S et al. · 2009RCTEating chocolate can significantly protect the skin from UV light — randomised controlled trialView study →Reference 4Mogollon JA et al. · 2014RCTChocolate flavanols and skin photoprotection: a parallel, double-blind, randomised clinical trialView study →}. Oral prevention tied to flavanol content (ordinary low-flavanol chocolate does not apply); modest at best and no replacement for sunscreen.

Standardized maritime-pine bark extract (Pycnogenol) — an oral proanthocyanidin extract — has the genus’s most developed human skin data, including protection against UV-induced damage and improved skin barrier and elasticity ^{6,7Reference 6Robertson NU et al. · 2020Systematic reviewPine bark (Pinus spp.) extract for treating chronic disorders — systematic reviewView study →Reference 7Grether-Beck S et al. · 2016ReviewFrench Maritime Pine Bark Extract (Pycnogenol®) Effects on Human Skin: Clinical and Molecular Evidence — reviewView study →}. Oral prevention; the UV-specific human evidence is review-level and applies only to the bark extract, not to needle tea or resin, and does not replace sunscreen.

The essential oil of Tagetes lucida reduced intracellular reactive oxygen and showed modest photoprotection with an in-vitro SPF of about 13–14 ^{5Reference 5Caballero-Gallardo et al. · 2022In vitroPhotoprotective agents from aromatic plants: antioxidant activity and cytotoxic potential of Tagetes lucida Cav. essential oil — in vitro studyView study →}. Topical prevention signal only — a single in-vitro measurement on the essential oil, not tested on human skin.

Fomes fomentarius melanin-like pigments carry high radical-scavenging and a moderate UVB-absorbing (physically sun-protective) capacity in aqueous-alkali extracts close to the traditional preparation ^{11,12Reference 11Kalitukha et al. · 2021In vitroChemical composition and ultraviolet absorption activity of an aqueous alkali extract from Fomes fomentarius fruiting bodies — in vitroView study →Reference 12Darkal et al. · 2021In vitroUnleashing the biological potential of Fomes fomentarius via dry and wet milling — in vitroView study →}. A topical prevention rationale (UVB absorption) but entirely in vitro; no human sunburn data.

Aloe gel is one of the oldest and most widespread topical remedies for burns and skin irritation; mechanistically, topical application is reported to inhibit thromboxane B2 and prostaglandin F-2α, preserving dermal circulation and improving first- and second-degree burn outcomes ^{1Reference 1Bone · 2003A clinical guide to blending liquid herbs: Herbal formulations for the individual patient}. A classic after-sun treatment (soothing an established burn); the support is for thermal burns and traditional use rather than a sunburn-specific RCT, and controlled sunburn evidence in the wider literature is mixed.

Lavender is traditionally applied topically for rashes, skin irritations, sunburn and insect bites. After-sun treatment/soothing only — a well-established traditional use with no clinical trial; not a substitute for sun protection.

10% hamamelis distillate lotion suppressed UVB-induced erythema by ~20–27% versus vehicle in 30 volunteers ^{13Reference 13Hughes-Formella BJ et al. · 1998RCTAnti-inflammatory effect of hamamelis lotion in a UVB erythema test — randomised controlled trialView study →}; a 40-volunteer follow-up found the effect real but small ^{14Reference 14Hughes-Formella BJ et al. · 2002RCTAnti-inflammatory efficacy of topical preparations with 10% hamamelis distillate in a UV erythema test — randomised controlled trialView study →}; an earlier controlled study found reduction of UV- and tape-stripping-induced erythema but hydrocortisone 1% superior ^{15Reference 15Korting HC et al. · 1993RCTAnti-inflammatory activity of hamamelis distillate applied topically to the skinView study →}. Human metabolites of a Hamamelis extract modulated fibroblast ECM components after UV-A exposure, a plausible route to the after-sun/anti-photoaging use ^{16Reference 16Natella F et al. · 2021In vitroHuman metabolites of Hamaforton™ (Hamamelis virginiana L. extract) modulate fibroblast extracellular-matrix components in response to UV-A irradiation — in vitroView study →}.