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Dr. Robert Pastore
Last updated on
Fact Checked by Dr. Robert Pastore

What is this ingredient known for?

L-Theanine is well-known as a relaxing, but non-sedating amino acid supplement.

Why are we using it in Power Off?

Function #1: L-Theanine promotes a calming response.

L-Theanine may help inhibit cortisol neuron excitation, which promotes a calming response in the body and promotes staying asleep. Studies show that people report reductions in perceived stress when given Theanine in standard doses.

Yoto A, Motoki M, Murao S, Yokogoshi H. Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology. 2012;31(1):28. doi:10.1186/1880-6805-31-28.

Kimura K, Ozeki M, Juneja L, Ohira H. l-Theanine reduces psychological and physiological stress responses. Biological Psychology. 2007;74(1):39-45. doi:10.1016/j.biopsycho.2006.06.006.

Function #2: L-Theanine has been shown to improve sleep quality.

Clinical studies have indicated that subjects taking L-Theanine obtained significantly higher sleep percentage (sleep efficiency) and reduced nocturnal motor activity scores compared to those on a placebo.

Rao T, Ozeki M, Juneja L. In Search of a Safe Natural Sleep Aid. Journal of the American College of Nutrition. 2015;34(5):436-447. doi:10.1080/07315724.2014.926153.

Lyon, MR, Kapoor MP, Juneja LR. The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial. Alternative Medicine Review. 2011;16.4:348.

Can be found in:

The leaves of Camellia Sinensis (green, black and white tea)