I've been taking 1.2-1.5 g of l-theanine a day for two months, and I haven't experienced any significant issues with tolerance or rebound anxiety.
Those are comparitively very high dosages. Why do you take that much?
The FDA's established limit for l-theanine is 1.2 g a day. No reason is given why someone shouldn't exceed that though. I'd assume that it would increase the potential for receptor downregulation and rebound anxiety.
I've noticed no rebound anxiety or side effects from taking l-theanine in these doses daily. On the average day, I take 1g in 5 divided 200mg doses. I arrived at this dose after experimenting with different amounts.
I recently experimented with up to 2g a day until I ran out, and I experienced no crash or withdrawal when I stopped for a few days. I definitely felt less relaxed, but it seemed to be because the l-theanine had been helping so much.
I have serious issues with constantly feeling anxious and high strung, despite doing a lot of strenuous physical activity every day. I used to be able to keep it under control by taking benzos four times a day, but I'd prefer to do something that's gentler on my brain.
Edited by moleface, 13 July 2011 - 02:45 AM.