L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count

Not bad overall but I didn't get the full effect from it

Not effective and cannot return the product either

I find this particular formulation of L-Theanine to be a very good adjunct to help me fall asleep and stay asleep. This formula by the Doctor's Best brand has "Suntheanine," which is a patented form of the amino acid L-Theanine known to promote relaxation. I've taken this formula steadily for about a year at bedtime with only good results as part of an overall sleep hygiene routine that also includes listening to a Calm sleep story on the app in my phone, next to my bed. Also why I like this particular formulation is that it has just 150 mg of the Suntheanine/L-theanine in it, which is less than most other formulas on the market. IMO, less of something often translates to "more." I don't know how long it stays in the system, but probably not for very long, because I wake up normally, with no leftover drowsiness. Another reason why I like this supplement is because it's NON-hormonal. Some folks use melatonin to promote sleep, but I've always avoided that, since melatonin is a hormone, and from what I understand, it's not meant to be used long-term. For me, this has performed as a safe and effective over-the-counter sleep aid. As of December 2025, it was still reasonably priced.

Really does work for anxiety, as someone who suffers from anxiety and been on a lot of prescription medication thus L-Theanine is almost as good, take as directed and give it some time, helped me during a Benzo taper.

This supplement really helps with calm focus. I take it in the morning with coffee and it removes any nervous edge from caffeine. Clean product, no aftertaste, works exactly as expected.

I was reading online about supplements that boost your serotonin and decided to try this. It elevated my mood but got me antsy. I didn’t take it more than one day. I felt weird & not like myself. I think you should do more research before taking this supplement. That’s my honest opinion. Nothing wrong with the product, just wasn’t for me.

This works really great for anxiety, calms me right down when I need it. I don't use it often but it sure is good to have it when I need it. It also helps me after a particularly long hard day at work when I'm having a lot of pain because it just relaxes me. I'm very glad it's not a prescription item. Thank you for having it Amazon!