TLDR Caffeine in cosmetics may reduce cellulite, protect skin, and stimulate hair growth, but more research is needed on its use and effects.
The 2012 document reviews caffeine's role in cosmetics, highlighting its ability to penetrate the skin and its benefits in reducing cellulite, enhancing microcirculation, acting as an antioxidant, and stimulating hair growth. Caffeine prevents fat accumulation and promotes fat degradation by inhibiting phosphodiesterase, which increases cAMP in cells. It protects against UV radiation, potentially preventing UV-induced skin cancers by scavenging radicals and inducing apoptosis in damaged cells. Studies cited include one with a 7% caffeine solution reducing cellulite and another testing a 3% caffeine gel for eye puffiness, though without significant results. Caffeine also inhibits 5-a-reductase, which may help manage androgenetic alopecia, and can remain in hair follicles for up to 48 hours post-shampoo application. The document suggests caffeine's cosmetic potential is significant but calls for further research on dosing, delivery systems, and potential side effects.
82 citations,
May 2009 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Caffeine penetrates human skin in lab tests similarly to real-life conditions, but actual skin use is still essential for accurate results.
46 citations,
January 2008 in “Journal of cosmetic dermatology” Caffeine and siloxanetriol alginate caffeine in emulsion form can reduce fatty cell size and number, potentially treating cellulite effectively.
182 citations,
December 2007 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Hair follicles significantly increase the speed and amount of caffeine absorbed through the skin.
61 citations,
January 2018 in “Cosmetics” Coffee silverskin may be a beneficial and safe ingredient for cosmetics, offering hydration, firmness, and potential hair growth benefits.
10 citations,
June 2019 in “International Journal of Cosmetic Science” Some plant-based chemicals may help with hair growth, but more research is needed to confirm their effectiveness.
76 citations,
August 2018 in “International Journal of Cosmetic Science” Dermal Papilla cells are a promising tool for evaluating hair growth treatments.
February 2024 in “Skin health and disease” Many popular skincare products claim to prevent aging but lack strong evidence to prove their effectiveness and safety.
58 citations,
March 2013 in “Human Reproduction Update” Products should be called 'sperm-safe' only after thorough, well-designed tests.
