Zhang M, Jia C, Zhuang J, Hou YY, He XW, Li WY, et al
"Crystal structure of human gamma-butyrobetaine hydroxylase"
However, for those looking for a more direct approach, supplementation may be an option

Major Ingredients Water, Ethylhexyl Methoxycinnamate, Butylene Glycol, Ethylhexyl Salicylate, Octocrylene, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Butyl Methoxydibenzoylmethane, Dipropylene Glycol, Niacinamide (20,000ppm), Squalane, C14-22 Alcohols, 1,2-Hexanediol, Polyglyceryl-2 Stearate, Propanediol, Hydroxyacetophenone, Glyceryl Stearate, Stearyl Alcohol, C12-20 Alkyl Glucoside, Tromethamine, Centella Asiatica Extract (1,510ppm), Carbomer, Melaleuca Alternifolia (Tea Tree) Extract, Hippophae Rhamnoides Fruit Extract, Vitis Vinifera (Grape) Fruit Extract, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Uncaria Sinensis Extract, Glycerin, Adenosine, Disodium EDTA, Oryza Sativa (Rice) Bran Extract, Hydrogenated Phosphatidylcholine, Caprylic/Capric Triglyceride, Sodium Hyaluronate, Glucose, Hydrolyzed Collagen, Sucrose Stearate, Glutathione (10ppm), Cyclodextrin, Cetearyl Alcohol, Caprylyl Glycol, Beta-Glucan, Caprylhydroxamic Acid, Ethylhexylglycerin, Asiatic Acid, Asiaticoside, Madecassic Acid, Madecassoside, Tropolone, Hyaluronic Acid, Potassium Hyaluronate Ingredients subject to change at manufacturer's discretion

While further human studies are needed, GHK-Cu holds promise for scalp care and hair-thickening products
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