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From looking after your thyroid to optimising fertility, iodine is a key nutrient in our diets.
Sophie Medlin
Head of Nutritional Research
January 13, 2020
3 min read

Major Functions

Thyroid hormones - Maintenance of metabolism - Cognitive function

In every dose

150mcg (equal to 2 cups of yogurt or 6 slices of fortified white bread)

What’s in it for my brain?

Brain scans in people with iodine deficiency have shown that structures within the brain such as the hippocampus and neurotransmitters (chemicals in the brain) are affected by iodine deficiency. It’s widely recognised that iodine contributes to normal cognitive function; the exact mechanism is unclear, but it’s thought to be related to gene expression.

Fringe benefits

Iodine helps to make thyroid hormones, which control our metabolic rate

Essential for optimal fertility

Plays well with

Selenium for thyroid function 

Folate for women trying to conceive 

B12 and other B vits for those on plant-based diets

Clever stuff

Iodine is especially important in foetal and childhood development, as it is essential for thyroid hormone synthesis, which is important in normal brain development. A trial of 310 mildly deficient school children found that iodine supplementation in people who are deficient improved information processing, fine motor skills and problem solving.


Here’s a handful of relevant scientific studies on iodine.

  • Zimmermann, M. B., Connolly, K., Bozo, M., Bridson, J., Rohner, F., & Grimci, L. (2006). Iodine supplementation improves cognition in iodine-deficient schoolchildren in Albania: a randomized, controlled, double-blind study. The American journal of clinical nutrition, 83(1), 108-114.

  • Redman, K., Ruffman, T., Fitzgerald, P., & Skeaff, S. (2016). Iodine deficiency and the brain: Effects and mechanisms. Critical reviews in food science and nutrition, 56(16), 2695-2713.

  • Bouga, M., Lean, M. E., & Combet, E. (2018). Iodine and pregnancy—a qualitative study focusing on dietary guidance and information. Nutrients, 10(4), 408.

  • Gordon, R. C., Rose, M. C., Skeaff, S. A., Gray, A. R., Morgan, K. M., & Ruffman, T. (2009). Iodine supplementation improves cognition in mildly iodine-deficient children. The American journal of clinical nutrition, 90(5), 1264-1271.

  • Hernández, M., Wilson, K. L., Combet, E., & Wardlaw, J. M. (2013). Brain findings associated with iodine deficiency identified by magnetic resonance methods: a systematic review. Open Journal of Radiology, 3(4), 180-195.

  • Fitzgerald, P. C. E. (2012). The effect of iodine supplementation on cognition of mildly iodine deficient young New Zealand adults (Doctoral dissertation, University of Otago).

  • Beydoun, M. A., Beydoun, H. A., Kitner-Triolo, M. H., Kaufman, J. S., Evans, M. K., & Zonderman, A. B. (2013). Thyroid hormones are associated with cognitive function: moderation by sex, race, and depressive symptoms. The Journal of Clinical Endocrinology & Metabolism, 98(8), 3470-3481.

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This product is not designed to replace a varied and balanced diet. Do not exceed stated dose. If you are pregnant, breastfeeding or taking any medication, please consult your doctor before use. Do not use it if the sachet has been opened. Store in a cool, dry place. Keep out of reach of children.

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