I thought people were dosing themselves with a base amino acid. Duh. Theanine is an amino acid found in green tea, but not a base amino acid, ie doesn't form proteins. Can cross the blood-brain barrier and can certainly modulate brain function.
Not to be confused with:
* Thiamine:
Vitamin B1, a molecule your body does not produce so you a get it from a food source. Needed for biochemical pathways that convert carbohydrates into energy. Not an amino acid.
* Thymine:
One of the four nucleotide bases in DNA, pairs with Adenine.
Synthesized in the body from the pyrimidine synthesis pathways
