Ingredient guide
Selenium (selenomethionine): evidence, dose and safety
Selenium is a trace element found in Brazil nuts, fish, eggs and grains; the amount in food depends on the soil. We use selenomethionine, the main form in food.
At a glance
- Strongest evidence
- C Limited
- Dose in our plans
- 100 µg a day for adults
- Adult upper limit
- 255 µg a day from food and supplements together
- Safety checks
- 0 situations and 0 medicine or supplement interactions, checked against your answers in every plan
- Reviewed
- Atrum Labs clinical team (MD, PhD), November 2026
Authorised EU health claim
Selenium contributes to the maintenance of normal hair.
What the research looked at
Each line is one body of research, graded A (strong) to D (weak). How we grade evidence. What each study measured is explained in your personal plan.
| Grade | Who was studied | References |
|---|---|---|
| C | People with Hashimoto thyroiditis |
|
How much
- Our plans usually use 100 µg a day for adults. The exact dose depends on your lab results, age and medicines.
- Adult upper limit: 255 µg a day from food and supplements together. Source: EFSA NDA Panel 2023 selenium UL.
- Children's doses are set by age, and some ingredients are for adults only.
Written and reviewed by the Atrum Labs clinical team (physician-scientists, MD, PhD) from our clinical knowledge base, version 0.2.0-draft. This page is general information, not medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle.
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