Source Naturals Serene Science® L-Theanine is an amino acid found naturally in green tea leaves, without causing drowsiness.*

Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.

Suggested Use: As a dietary supplement, take as directed.

Frequently Asked Questions

What is L-Theanine?

L-Theanine is an amino acid found naturally in green tea leaves.*

Can L-Theanine be taken with caffeine?

Yes — L-Theanine and caffeine are a well-researched combination, and many people take L-theanine alongside their morning coffee.*

Does L-Theanine cause drowsiness?

No. Unlike common sleep aids or sedatives, L-theanine does not cause drowsiness, which is why it can be taken at any time of day.*

Is Serene Science L-Theanine 200mg suitable for daily use?

Yes. L-theanine is generally well-tolerated and suitable for daily use by adults. Source Naturals Serene Science L-Theanine provides 200 mg per tablet in a clean formula free from common allergens. If you are pregnant, breastfeeding, or taking antidepressant medications such as MAOIs or SSRIs, consult your healthcare professional before use.