• Pure L-Theanine Powder
  • Mild taste
  • May help with relaxation and anxiety

Muscle Feast L-Theanine:

  • May reduce anxiety
  • May help with mental focus
  • Might help sleep issues
  • May improve mental focus


What is L-Theanine?
L-theanine, an amino acid found in green tea.  It may reduce anxiety by blocking excitatory stimuli at glutamate receptors in the brain while stimulating production of the inhibitory, relaxing neurotransmitter GABA. L-theanine may relieve stress without causing drowsiness or impairing motor behavior. In fact, studies show it improves alertness and attention. Researchers are now examining L-theanine’s applications beyond its potential anti-anxiety effects. Studies suggest a role for L-theanine in supporting cognitive function and preventing cognitive loss by protecting brain cells.

Recommended dose:
The recommend dose is 1/8 of a teaspoon (250mg) no more than once every 12 hours.

Any Side Effects?
There have not been any reported side effects with L-theanine.  However, this does not mean you can take as much as you want and not suffer any adverse effects.  Do not exceed one serving every 12 hours. If you have liver or kidney disease, you should not take amino acids without asking your doctor. It is crucial that you always speak to a knowledgeable healthcare provider before taking any dietary supplements. This advice is also recommended for anyone suffering from a health condition.

Pregnant and nursing women should only take an amino acid after consulting your physician.

Available in 1 flavor options:



Mix into water a small amount of water or place directly into your mouth and wash down with water.



Why Muscle Feast?

We guarantee our supplements to be the freshest and purest available. Muscle Feast supplements are manufactured under the strictest HACCP, FDA, and Kosher standards, producing the highest quality and purest supplements available. Our raw ingredients undergo state of the art analysis to ensure zero impurities and strict adherence to product labeling. When it comes to price and quality you can't beat Muscle Feast. We guarantee it!

Important facts you should know about our supplements:

  • Laboratory tested for purity
  • Strict adherence to GMP, HACCP and Kosher standards
  • Licensed and regularly inspected by The Ohio Department of Agriculture
  • Freshly manufactured - not expired or closeout
  • Spoon mixes with no gritty taste or residue
  • Backed by the Muscle Feast 30-day money back guarantee

How can our quality be so high and our prices so low?

We are able to sell the highest quality products at these prices because:

We have over 30 years experience in raw material procurement and we are very selective in what material we use.

We work with several of the best medical doctors in the country and only carry products they support.

We have our own quality test equipment to ensure we only use the highest quality products available.   

Theanine has a rating of 4.9 stars based on 51 reviews.