Formal Name: 2-amino-3-methylbutanoic acid
Supplement Forms: Pills, food, liquid

Recommended Daily Allowance

  • Infants: (0 to 12 Months) 128 mg/kg of body weight
  • Children: (1 to 13 years) N/A
  • Adolescents: (14 to 18 Years) N/A
  • Adults: (19 and Older) 16 mg/kg of body weight
  • Lactating Women: N/A
  • Pregnant Women: N/A

Notes: mg stands for milligrams and kg stands for kilograms.

Additional Information

Leucine is part of the branched-chain amino acids which also contains isoleucine and valine. In combination with these other two amino acids, the branched-chain amino acids make up nearly a third of the muscular system of the body. Leucine is usually broken down into more simple compounds by the body as part of its role in maintaining overall health.

Bodily Functions Leucine Assists

One of leucine's biggest roles is the regulation of overall protein production. It's availability within the body promotes a balanced production of proteins relative to the demands of the body. Leucine is also present in various other processes such as growth hormone production, immune system activities such as wound and infection healing, muscle tissue repair and regulation of blood sugar and overall energy levels. Leucine is another amino acid that can be found in various strength training performance gain supplements because of it's ability to help prevent excess muscle protein breakdown and helps increase muscle protein production.

Symptoms Of Deficiency:
  • Deficiency of leucine is highly rare.
  • Deficiency in leucine may be similar to the symptoms of hypoglycemia with general symptoms including dizziness, headaches, and fatigue.
Foods High In Leucine

Sources rich in leucine include whole grains, whey protein, milk and milk products, eggs, red meats, poultry, soya beans, peas, and leafy vegetables.

Ailments That Leucine Helps Against:
  • Contributes to lower blood sugar levels
  • May improve insulin-resistant state
  • May be beneficial in treatment of liver damage and disease
  • Aids in treatment of phenylketonuria - inability to metabolize phenylalanine
Side Effects And Toxicity

Patients with kidney or liver disease should talk to a doctor before beginning an increased intake of amino acids. High doses of may lead to pellagra but no toxicity has been identified.