Methionine is a sulfur-containing amino acid that is a part of all the proteins in the body. It supports hair growth, but other than that there isn't much information about its functions in personal care products.
Science
1
Oshimura, E., & Sakamoto, K. (2017). Amino Acids, Peptides, and Proteins. Cosmetic Science and Technology, 285–303.
2
Zhu, Y., Wu, Z., Liu, H., Liu, G., & Li, F. (2020). Methionine promotes the development of hair follicles via the Wnt/β-catenin signalling pathway in Rex rabbits. Journal of animal physiology and animal nutrition, 104(1), 379–384.
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