Study summary · research use only
Insights into Tanning Biology and Tanning Products
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This PRISMA-guided systematic review assessed 68 peer-reviewed studies on the mechanisms, clinical uses, formulations, and adverse effects of self-tanning agents including dihydroxyacetone (DHA), melanotan, forskolin, and carotenoids. The abstract reports that DHA induces pigmentation via the Maillard reaction and has been used in vitiligo, erythropoietic protoporphyria, and as a possible topical antifungal, but raises concerns about DHA-related cytotoxicity, genotoxicity, and systemic absorption. It states unregulated melanotan I and II use has been linked to serious adverse effects including rhabdomyolysis, renal infarction, and priapism, that forskolin stimulates melanin production independently of melanocortin receptors with reported activity in animal models (species not specified), and that orally ingested carotenoids accumulate in skin and subcutaneous fat, producing a yellow-orange hue. The authors note limited standardization and long-term safety data.
Abstract
This systematic review aims to critically assess the literature on the mechanisms of action, clinical uses, formulation strategies, and adverse effects of self-tanning agents, with a focus on dihydroxyacetone (DHA), melanotan, forskolin, and carotenoids. A systematic literature review was conducted following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Studies were screened for relevance to the mechanisms of action, clinical applications, chemical formulations, or adverse effects of self-tanning molecules. A total of 68 peer-reviewed studies were included. DHA induces pigmentation via the Maillard reaction and has demonstrated additional dermatologic applications, including use in vitiligo and erythropoietic protoporphyria and as a potential topical antifungal. Concerns persist about DHA-related cytotoxicity, genotoxicity, and systemic absorption. Unregulated melanotan I and II use has caused serious adverse effects, including rhabdomyolysis, renal infarction, and priapism. While forskolin stimulates melanin production independently of melanocortin receptors and has demonstrated efficacy in animal models, carotenoids, when ingested orally, accumulate in skin and subcutaneous fat, creating a yellow-orange hue. Both agents remain underresearched in human populations. Limitations include lack of standardized reporting across included studies, variability in study outcomes, and limited long-term safety data. Sunless tanning agents offer UV-free alternatives for cosmetic pigmentation but are not without risk. While DHA and melanotan remain the dominant agents in current use, forskolin and carotenoids offer alternative pathways for pigmentation and photoprotection. Further clinical studies are necessary to evaluate long-term safety, efficacy across skin types, and formulation optimization. Regulatory frameworks and dermatologic guidance must evolve to reflect the expanding landscape of sunless tanning modalities.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Don't just trust this summary: follow the citation to its source and read it yourself. Research use only.