Promotion of Hair Growth by Applying Sulfur Amino Acids and Other Compounds to the Skin

    January 1974 in “ Nippon Nōgei Kagakukaishi/Nihon Nougei Kagakkaishi ”
    Norikazu Matsumoto, Tadao Hasegawa, Takao Suzuki
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    TLDR Applying L-methionine and L-serine to the skin promotes the most hair growth.
    The study found that applying L-methionine and L-serine to the skin was most effective in promoting hair growth, followed by acetyl L-methionine and L-serine. Glutathione application, however, inhibited hair growth. Direct application of L-cysteine was effective but less so than L-methionine and L-serine. Adding inosine to L-methionine and L-serine resulted in thicker and longer hair roots. There was a proportional relationship between hair weight and root length. Acetyl L-methionine solution did not produce a bad odor or decompose after being stored at 37°C for 15 weeks.
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