Just FYI, an "expert" states that does up to 1000mg are safe *but* one may experience some sedation at this level.
GREAT page on the brand that most people swear by:
See "How Much is Too Much?" under the write-up by Dr. Lyon. I've used various brands and prefer "Source Naturals" - great reviews on iHerb.com. Tabs or capsules available. Caps are like a couple dollars more per bottle of 60. Each cap is 200mg, which is actually a more 'standard' dose than 100mg... depending on where you look or what you read.
One thing to note is the 'Now' brand of l-theanine (Suntheanine) - a brand that *many* use is "cut" (it says it right on the bottle) with 100mg ionosol per each 200mg cap. This is supposed to enhance or synergize with l-theanine's effects, but I like to take straight-up l-theanine w/o anything else.
The Source Naturals brand (check iHerb.com for reviews) at a starting dose of 1000mg twice a day (I personally checked with a pharmacologist and was told this dose was safe; note a pharmacologist is much more than just a pharmacist). This dose enabled me to go from 8mg clonazepam (yes, 8mg - it was literally eating holes in my memory but was the only thing that stopped my GAD - mostly profuse sweating and an incessant sense of impending doom... before hitting 8mg I would often go for up to 100 hours without sleep) per day *down to 4mg* in only seven months!
I hope this helps.
I registered here just to post this info.
Best to all of you!
I take l-theanine in the formula, Seredyn, and think it works great. I'm doing stuff this year, i wouldn't normally do. I take as needed, up to 3 capsules, but they won't disclose how much l-theanine is in each capsule. It has niacinamide in the formula, which is supposed to be good also. I have taken l-theanine on its own, but only 100mg, as stated on container, and they say don't take more than this, but i have read elsewhere it is safe to take up to 600mg in 24hr period. So i would like to know the safe amount.