Goldenseal for Skin Health

Research suggests that goldenseal and its primary active compound berberine raise notable safety concerns for skin health rather than offering clear benefits, with multiple laboratory studies finding that berberine and, to a lesser extent, palmatine can generate harmful reactive oxygen species and cause significant cell death and DNA damage in human skin cells when exposed to UVA light. Studies indicate that topical application of goldenseal or berberine-containing products followed by sun or UVA exposure may be particularly risky, with one cell study reporting an 80% drop in skin cell viability and a tripling of DNA damage under these conditions. The available evidence consists largely of in vitro laboratory studies and animal toxicology work rather than human clinical trials, and a two-year animal feeding study conducted by the National Toxicology Program found increased rates of liver tumors in rats and mice, raising broader safety questions about regular goldenseal use. A 2020 review acknowledged that some properties of goldenseal's alkaloids are potentially promising but concluded that well-designed human trials are still lacking, leaving the overall picture mixed and underscoring the need for caution, particularly with topical use in sun-exposed conditions.