(Going caffeine free with Thesis removes both the caffeine and L-theanine content from the blends, unfortunately.) Generally, participants in studies are given about 2.5mg/kg of L-theanine, meaning a person who weighs 150lb would take 170mg of L-theanine
Because the study was observational, it cannot establish causation, but it does suggest a meaningful association that has prompted further investigation
Huang, Y., He, Y., Makarcyzk, M
Clinics 78:100305 Ott EC, Cavinder CA, Wang S, Smith T, Lemley CO, Dinh TT (2022) Oxidative stress biomarkers and free amino acid concentrations in the blood plasma of moderately exercised horses indicate adaptive response to prolonged exercise training
You usually need a prescription for medicines containing these peptides, so talk to your doctor if you are interested in trying one of these