June 2017 in “Asian journal of pharmaceutical and clinical research” Green tea extract gel safely increases eyelash length.
2 citations,
March 2015 in “Toxicology and Environmental Health Sciences” Rice bran extract caused moderate skin irritation but no eye irritation, while a diluted essence was not irritating to skin and only slightly to guinea pigs.
4 citations,
October 2017 in “International Journal of Applied Pharmaceutics” Licorice extract hair tonics are effective and safe for hair growth, except for mild eye irritation at the lowest concentration.
The 10% hibiscus leaf extract hair tonic promotes better hair growth than 2% minoxidil but can irritate eyes.
30 citations,
May 1999 in “Food and chemical toxicology” Procyanidin B-2 is safe to use on skin as a hair growth product.