SHEET /m/potassium-iodide · PubChem CID 4875 · CAS 7681-11-0 · REV 2026.07
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Potassium iodide from source
IK · 166.0028 g/mol
Thyro-Block · Pima · Kali iodide · Thyroshield
chemical compound
CategoryNutrient
Fig. 1 · 2D structure RDKit
[K+].[I-]
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 Potassium iodide is 285 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
19.9 g
a median lethal dose scaled to 154 lb (19,950 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
285 mg/kg · moderately toxic · LD50 rat iv from source
The dose lens above scales this to a body weight.
DangerIrritantHealth hazardEnvironmentalH302, H315, H317, H319, H320, H334, H360, H361, H362, H370, H372, H373, H411from source