Which amino acids help hair growth?

According to Hill, the best amino acids essential for hair growth have been identified as cysteine, which provides sulfur to hair cells, improving strength, elasticity, and hair texture; arginine, which supports blood circulation around the hair follicle; lysine, a restorative amino acid that supports collagen

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You can also ask does l-tyrosine deplete dopamine?

Central dopamine function is reduced by decreasing the availability of the catecholamine precursor, tyrosine, using a tyrosine-free amino acid mixture containing multiple large neutral as well as branched chain amino-acids, which compete with tyrosine for uptake into the brain. Regarding this, what is the best form of l-tyrosine? NAT appears to be the preferred form of supplementary tyrosine due to its bioavailability and easy absorption, thus providing more effective nootropic activity than plain tyrosine.

Is 1000mg of L-Tyrosine too much?

L-tyrosine has not been reported to cause any serious side effects. However, it is not known whether long-term use of L-tyrosine, particularly in large amounts (such as more than 1,000 mg per day) is safe. For that reason, long-term use of L-tyrosine should be monitored by a doctor. Should I take tyrosine or phenylalanine? Phenylalanine is used to form tyrosine. Thought to be useful in the treatment of depression and anxiety, tyrosine is important to metabolism. Tyrosine also aids in the reduction of body fat. Practitioners recommend phenylalanine for treatment of depression, bipolar disorder, hyperactivity, and Parkinson's Disease.

And another question, does tyrosine increase testosterone?

L-tyrosine also enhances testosterone levels and semen quality of bulls (16).