Theanine makes me a little too slow and I can't take it anymore during the day. It is nice before bed as it makes me super calm even at low 100mg doses. Phenibut is the devil, imo. Feels wonderful when you are on it, but it literally makes me a different person for 2-3 days after taking it. Very agitated, spacy, and groggy. I tossed it in the trash.