SHEET /m/riboflavin · PubChem CID 493570 · CAS 83-88-5 · REV 2026.07
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Riboflavin from source
C17H20N4O6 · 376.4 g/mol
vitamin B2 · Riboflavine · Lactoflavin · Vitamin G
chemical compound
CategoryNutrient
TypeVitamin
Fig. 1 · 2D structure RDKit
CC1=CC2=C(C=C1C)N(C3=NC(=O)NC(=O)C3=N2)C[C@@H]([C@@H]([C@@H](CO)O)O)O
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported rat oral LD50 for Riboflavin is 10,000 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
700.0 g
a median lethal dose scaled to 154 lb (700,000 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
10,000 mg/kg · very low toxicity · LD50 rat oral from source
The dose lens above scales this to a body weight.
2 more reported values
- 560 mg/kgLD50 · other · rat
- 5,000 mg/kgLD50 · other · rat
Keep roaming
Where Riboflavin leads
Relatedcomputed