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About product and suppliers:
        Alibaba.com offers 1,621 l theanine products. About 24% of these are tea extract, 22% are herbal extract, and 1% are antioxidants. 

A wide variety of l theanine options are available to you, such as free samples. 

There are 1,614 l theanine suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United States, and Japan, which supply 97%, 1%, and 1% of l theanine respectively. 

L theanine products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 450 with ISO9001, 276 with Other, and 116 with ISO22000 certification.