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Mineral

Iodine (as Fermented Iodine Glycinate)

Also known as: Iodine glycinate, Chelated iodine, Iodide

A
Evidence

Iodine is an essential mineral critical for thyroid hormone synthesis and metabolic regulation. Glycinate chelation may enhance absorption compared to traditional iodide forms.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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Primary uses

  • Thyroid hormone synthesis
  • Metabolic regulation
  • Cognitive development
  • Reproductive health

How it works

  • Incorporation into thyroid hormones (T3, T4)
  • Cofactor for thyroid peroxidase
  • Regulation of cellular metabolism

Dosage

Typical range
75-150 mcg daily
Timing
Consistent daily timing recommended
With food
Can be taken with or without food
Duration
Ongoing supplementation recommended in iodine-depleted regions or for those at risk
Special populations
RDA: 150 mcg (adults), 220 mcg (pregnant), 290 mcg (lactating), 90 mcg (children 4-8). Higher doses may be needed in pregnancy.

Forms

  • Iodine glycinate (chelated form)· 70/100

Safety

Common side effects

  • Generally well-tolerated at recommended doses

Contraindications

  • Hyperthyroidism or thyroiditis (unless medically supervised)
  • Iodine allergy

Products containing Iodine (as Fermented Iodine Glycinate)

Top-scoring supplements in our catalog that list Iodine (as Fermented Iodine Glycinate) 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)
90
Thorne
Advanced Nutrients
88
Thorne
Basic Nutrients 2/Day
88
Thorne
Basic Prenatal
88
See all products →

Evidence notes

Iodine deficiency is a well-established public health concern with strong evidence for supplementation. RCT evidence supports iodine's role in thyroid function and cognitive development.

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

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.