SHEET /m/fumaric-acid · PubChem CID 444972 · CAS 110-17-8 · REV 2026.07
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Fumaric acid from source
C4H4O4 · 116.07 g/mol
trans-Butenedioic acid · Allomaleic acid · Lichenic acid · Boletic acid
chemical compound
CategoryFood & flavor
Chemical familyCarboxylic Acids
Fig. 1 · 2D structure RDKit
C(=C/C(=O)O)\C(=O)O
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported mouse other LD50 for Fumaric acid is 100 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
7.0 g
a median lethal dose scaled to 154 lb (7,000 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
100 mg/kg · moderately toxic · LD50 mouse other from source
The dose lens above scales this to a body weight.
1 more reported value
- 20,000 mg/kgLD50 · dermal · rabbit
WarningIrritantH319, H402from source
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