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E641Flavor enhancerLow concern
L-Leucine
In plain words
The short version
An essential branched-chain amino acid — used as a tabletting lubricant and a sweetness modifier.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified — endogenous nutrient. Dietary additions metabolized identically to protein-derived leucine. Pharmacological supplement doses are sometimes restricted in clinical maple-syrup-urine-disease patients (a rare inborn error of metabolism).
The detail
Educational information only. Not medical or dietary advice.