SHEET /m/phenylalanine · PubChem CID 6140 · CAS 63-91-2 · REV 2026.07
Phenylalanine from source
C9H11NO2 · 165.19 g/mol
L-phenylalanine · (S)-2-Amino-3-phenylpropanoic acid · (2S)-2-amino-3-phenylpropanoic acid · 3-Phenyl-L-alanine
chemical compound
Fig. 1 · 2D structure RDKit
C1=CC=C(C=C1)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 Phenylalanine is 5,287 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
“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
5,287 mg/kg · very low toxicity · LD50 rat other from source
The dose lens above scales this to a body weight.
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