MINERALS & TRACE ELEMENTS - RŌNIN V4.1
Why 150mcg of Iodine?
Sole precursor to thyroid hormones T3 and T4. UK surveys (NDNS) consistently show iodine inadequacy - particularly in women avoiding dairy and in vegans. 150mcg = 100% NRV.
- CATEGORY
- Micronutrients
- DOSE
- 150mcg
- FORM
- Potassium iodide - pharmaceutical grade
- EVIDENCE LEVEL
- Strong - EFSA approved, well-established
How Iodine works
Iodine is the sole substrate for thyroid hormone synthesis. The thyroid gland concentrates iodine against a steep gradient via the sodium-iodide symporter (NIS), incorporating it into tyrosine residues on thyroglobulin to form T3 and T4. These hormones regulate basal metabolic rate, thermogenesis, protein synthesis, and - critically - brain development in utero and early childhood.
The UK National Diet and Nutrition Survey (NDNS) consistently identifies iodine as a nutrient of concern, with median intakes in women falling below the Lower Reference Nutrient Intake. Declining consumption of dairy products (the primary dietary source) has worsened this trend. Insufficient iodine intake is associated with reduced thyroid hormone output - reduced metabolic rate, fatigue, and cognitive fog - without meeting the clinical threshold for diagnosis.
Key benefits
- Sole substrate for thyroid hormone T3 and T4 synthesis
- Governs basal metabolic rate and thermogenesis
- UK women frequently inadequate - dairy avoidance worsens the trend
- Supports brain development and neurological function
- 150mcg = 100% NRV
The researchGB-NHC
Peer-reviewed human trials supporting this ingredient at this dose.
- Iodine deficiency.PubMed →
- Iodine deficiency in pregnant women in the UK: the costs of inaction.PubMed →
- Nutrition challenges and opportunities when shifting to plant-based diets.PubMed →
IN THE FORMULA
Iodine
150mcg
Potassium iodide
WHEN TO TAKE IT
Any time of day. Iodine is water-soluble and does not require timing with food. UK women of reproductive age have particularly high rates of inadequate intake.