Theanine

Official resources

Fact sheets from the NIH Office of Dietary Supplements related to this ingredient group.

Ingredient group data in NutriNav is aligned with the NIH Dietary Supplement Label Database (DSLD).

1 form

Compare supplement forms of Theanine by absorption quality and what your body actually gets from each:

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Form	Absorption	Steps to absorb	Notes	Action
Theanine	—	—	—	View →

Building blocks of proteins. Essential amino acids must be obtained from diet, while non-essential can be synthesized by the body.

Absorption: Amino acids are generally well-absorbed. Some forms (like citrulline) are more effective than others (like arginine).

Interactions: Generally safe but high doses can cause digestive issues. Some amino acids can affect neurotransmitter levels.