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Isoleucine
Isoleucine
Low concern
Isoleucine is an essential amino acid required for protein synthesis and energy metabolism. FDA permits as nutrient amino acid; safe at typical supplementation levels.
Found in
461 products
What it is
An essential branched-chain amino acid (BCAA) used as a nutrient.
Nutrient/dietary supplement, protein quality fortification.
Why it's flagged
- contraindicated in maple syrup urine disease
What regulators actually say
"L-isoleucine may be safely used as a nutrient supplement in food."
"Isoleucine is one of the essential amino acids and a branched-chain amino acid (BCAA)."
Regulatory status
United States — FDA
GRAS as nutrient (21 CFR 172.320)
European Union — EFSA
Authorized as nutrient in foods for special medical purposes and food supplements
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