Mineral

Iodine (Potassium Iodide)

Also known as: KI, Potassium iodide

Evidence

Essential for thyroid hormone synthesis. Deficiency common in many regions. Careful dosing needed.

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Daily target & upper limit

150 mcg / day · UL 1100 mcg

Iodine (Potassium Iodide) has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:

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Primary uses

Thyroid function
Hormone production
Metabolic support

How it works

Incorporated into T3 and T4
Essential for thyroid peroxidase

Dosage

Typical range: 150-300 mcg daily
Timing: Any
With food: Optional
Duration: Long-term safe at appropriate doses
Special populations: Pregnancy needs 220-290 mcg

Forms

Potassium iodide
Kelp
Lugol's

Safety

Common side effects

Metallic taste

Contraindications

Autonomous thyroid nodules

Products containing Iodine (Potassium Iodide)

Top-scoring supplements in our catalog that list Iodine (Potassium Iodide) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Thorne

Thyroid Health Complex (formerly Thyrocsin)

Thorne

Basic Nutrients 2/Day

Evidence notes

Essential nutrient

Grade A: Multiple well-designed human trials support the main claims.

Related in Mineral

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.