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Source Naturals L-Leucine Powder 3.53oz | Muscle Fatigue Support

L-Leucine is an essential amino acid, specifically classified as a "branched-chain amino acid" (BCAA). BCAAs, especially leucine, stimulate muscle protein synthesis and may be the major fuel involved in muscle building processes. This makes them especially important for body builders and other athletes in sports that demand explosive strength.

Source Naturals L-Leucine Powder Product Highlights

  • L-Leucine May Improve Cognition 
  • Helps Reduce Muscle Fatigue 
  • Supports Protein Synthesis
  • Great for Bodybuilders & Athletes of All Types

What is L-Leucine Used For?

L-Leucine is an Essential Amino Acid which supports protein synthesis. It also helps to regulate several cellular processes such as protein synthesis, tissue regeneration, and metabolism. 

When is the Best Time to Take L-Leucine?

L-Leucine is best taken while fasted or with a low protein meal. 


Mix 1/2 teaspoon with water, shake, smoothie or beverage of your choice, ideally between meals. 

Source Naturals L-Leucine Powder 100 Grams Supplement Facts

Serving Size: 1/2 Teaspoon

Servings Per Container: About 76

L-Leucine 1g

Other Ingredients: None


This product does not contain dairy, egg, gluten, sugar, or preservatives. Do not take if you are pregnant or breastfeeding. Keep out of reach of children.