SHEET /m/leucine · PubChem CID 6106 · CAS 61-90-5 · REV 2026.07
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Leucine from source
C6H13NO2 · 131.17 g/mol
L-leucine · (S)-Leucine · (S)-2-Amino-4-methylpentanoic acid · (2S)-2-amino-4-methylpentanoic acid
chemical compound
CategoryBody
Fig. 1 · 2D structure RDKit
CC(C)C[C@@H](C(=O)O)N
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported rat other LD50 for Leucine is 5,379 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
376.5 g
a median lethal dose scaled to 154 lb (376,530 mg)
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
5,379 mg/kg · very low toxicity · LD50 rat other from source
The dose lens above scales this to a body weight.
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