My account


Important for thyroid function, selenium has links to reducing depression.
Sophie Medlin
Head of Nutritional Research
March 10, 2020
2 min read

Major Functions

Antioxidant - Metabolism - Thyroid function

In every dose

55mcg (equal to 1 Brazil nut or a can of sardines)

Fighting Talk

Reducing oxidative stress can protect against cognitive decline, which can lead to Alzheimer’s and mood disorders such as depression.

What’s in it for my brain?

Selenium’s powerful antioxidant properties can help to  prevent cell damage and oxidative stress caused by free radicals.

Fringe benefits

Essential for thyroid function

Antioxidant properties throughout the body

Plays well with

Iodine and Selenium work well together as they are both needed for thyroid function.

It also works well with other antioxidant vitamins (like vitamin E). Best dietary source is Brazil nuts, which aren’t commonly consumed.

Clever stuff

A study on young adults found that low or excessively high blood levels of selenium resulted in higher risk of depressive symptoms than in people with healthy levels.


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

  • Conner, T. S., Richardson, A. C., & Miller, J. C. (2015). Optimal serum selenium concentrations are associated with lower depressive symptoms and negative mood among young adults. The Journal of nutrition, 145(1), 59-65.
  • de Wilde, M. C., Vellas, B., Girault, E., Yavuz, A. C., & Sijben, J. W. (2017). Lower brain and blood nutrient status in Alzheimer's disease: Results from meta-analyses. Alzheimer's & Dementia: Translational Research & Clinical Interventions, 3(3), 416-431.
  • Cardoso, B. R., Apolinário, D., da Silva Bandeira, V., Busse, A. L., Magaldi, R. M., Jacob-Filho, W., & Cozzolino, S. M. F. (2016). Effects of Brazil nut consumption on selenium status and cognitive performance in older adults with mild cognitive impairment: a randomized controlled pilot trial. European journal of nutrition, 55(1), 107-116.
  • Berr, C., Arnaud, J., & Akbaraly, T. N. (2012). Selenium and cognitive impairment: A brief‐review based on results from the EVA study. Biofactors, 38(2), 139-144.
  • Santos, J. R., Gois, A. M., Mendonça, D. M., & Freire, M. A. (2014). Nutritional status, oxidative stress and dementia: the role of selenium in Alzheimer's disease. Frontiers in aging neuroscience, 6, 206.
  • Smorgon, C., Mari, E., Atti, A. R., Dalla Nora, E., Zamboni, P. F., Calzoni, F., ... & Fellin, R. (2004). Trace elements and cognitive impairment: an elderly cohort study. Archives of Gerontology and Geriatrics, 38, 393-402.
  • Slawinska, K., Bielecka, G., Iwaniak, K., Wosko, S., & Poleszak, E. (2017). Selenium and manganese in depression–preclinical and clinical studies. Current Issues in Pharmacy and Medical Sciences, 30(3), 151-155.

About Heights

  • Our Mission
  • Our Experts
  • Learn
  • Careers

The Sunday Supplement

Kickstart your week with the latest brain-performance tips from neuroscience & psychology, plus a tasty brain-food recipe.

By sharing your email address, you are agreeing to receive email marketing communications from Heights from time to time. We will not share your details with any 3rd parties. Please review our Privacy Policy for more information.

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.