The L-theanine available at liftmode is pretty darn good. It works as described and works with synergy with caffeine and helps take away some of the jitters. And I have no concern or fears about the quality because it has the classic liftmode purity standards, usually over 99% with most of their products.
Liftmode even sends you a 3rd party analysis of the batch of product you received to ensure quality and potency in every product. Great quality products across the board. I look forward to ordering from them again and they have great customer service.