Hair is made up of proteins. L-Cysteine is an amino acid that is known to promote hair growth. It improves hair quality and texture, and it is known to double the length of hair. L-Cysteine also prevents hair from falling out, and it has a detoxifying effect in the body.
Here's Some information I learned about Stemfit
The PESE and Vegetable proteins also provide a very potent dose of Arginine. Arginine is a precursor of nitric oxide and these effect the modulation of the hair cycle.