SHEET /m/stearic-acid · PubChem CID 5281 · CAS 57-11-4 · REV 2026.07
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Stearic acid from source
C18H36O2 · 284.5 g/mol
Octadecanoic acid · n-Octadecanoic acid · Stearophanic acid · Stearex Beads
chemical compound
CategoryNutrient
Chemical familyCarboxylic Acids
Fig. 1 · 2D structure RDKit
CCCCCCCCCCCCCCCCCC(=O)O
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported rat iv LD50 for Stearic acid is 21.5 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
1.5 g
a median lethal dose scaled to 154 lb (1,505 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
21.5 mg/kg · highly toxic · LD50 rat iv from source
The dose lens above scales this to a body weight.
3 more reported values
- 22 mg/kgLD50 · iv · rat
- 23 mg/kgLD50 · iv · mouse
- 5,000 mg/kgLD50 · dermal · rabbit
DangerToxicIrritantEnvironmentalH301, H315, H400from source
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