Source Naturals Serene Science® L-Theanine supports your natural pathways to relaxation without causing drowsiness. Preliminary studies show it may help to ease aspects of normal everyday stress, including occasional anxiety and tension. Human clinical studies show that taking L-theanine affects the pattern of alpha waves in the brain associated with states of relaxation and focused attention — making it an excellent choice for calm focus during the day.*

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 and how does it promote relaxation?

L-Theanine is an amino acid found naturally in green tea leaves. In the brain, it promotes the production of alpha waves — a brain wave pattern associated with calm, focused alertness. It may also support healthy levels of GABA, dopamine, and serotonin. Unlike sedatives, L-theanine promotes relaxation without causing drowsiness, making it ideal for use during the day.*

Can L-Theanine be taken with caffeine?

Yes — L-Theanine and caffeine are a well-researched combination. Clinical studies show they have a synergistic effect, with L-theanine helping to smooth out the jitteriness and anxiety that caffeine can cause, while maintaining the energy and focus benefits. Many people take L-theanine alongside their morning coffee for this reason.*

Does L-Theanine cause drowsiness?

No. Unlike common sleep aids or sedatives, L-theanine does not cause drowsiness. It promotes a state of calm alertness rather than sedation, which is why it can be taken at any time of day. Some people also find it helpful at bedtime to ease the transition to sleep, particularly if stress is interfering with relaxation.*

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.