There is no evidence that L-theanine can replace ADHD treatment
Casini, AF (2003)
A 1-year multicenter placebo-controlled study of acetyl-L-carnitine in patients with Alzheimers disease
Finally, 50 studies were included in the final report [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61]
In some instances, you might experience a brief tingling sensation after application often a sign that the active ingredients in the formula are working
Citation70 NAC is a synthetic derivative of L-cysteine, where an acetyl group attached to the nitrogen atom of the amino acid