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Both studies used the ingredient at 0.1% which also matches how much it usually shows up in products (at fractions of a percent)
Polygonum Multiflorum Root Extract (He Shou Wu): Highly regarded in traditional medicine for its ability to stimulate the hair follicle's transition into the anagen (growth) phase and potentially reduce premature graying by supporting melanin production
Saline is 0.9% sodium chloride
Int J Mol Sci 22 (1)
It is used exclusively for laboratory research and is not intended for human or veterinary application
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