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Also known as: selenomethionine, sodium selenite, selenium supplement
An essential trace mineral important for thyroid function, immune health, and antioxidant defence. The UK RNI is 60mcg/day for women. Particularly relevant for women with thyroid conditions, as selenium is required for the conversion of T4 to active T3. Some evidence for reducing thyroid antibodies in Hashimoto's thyroiditis.
This page contains self-reported experiences from the Narrated community — not clinical data. Outcomes are subjective. Always consult your doctor or specialist before starting, stopping, or changing any approach.
Total Reports
13
Median Score (Wk 8)
4/10
Would Continue
46%
Avg Duration
12 wk
Most Common Goal
thyroid hormones
Most Reported Side Effect
Nausea (62%)
Based on self-reported community data. Scores use a 1–10 scale.
Regulatory status does not mean an approach is safe or unsafe. Laws vary by country — check your local regulations.
Women who reported on Selenium mentioned using it for the following goals. This does not mean it is intended for or achieves any of these outcomes.
Aggregated patterns from 13 self-reported experiences with Selenium.
46% of women said they would continue this protocol
5.0/10 average self-reported outcome score at week 8
Most commonly reported effects: Nausea, Metallic taste
Outcome Score Distribution (Week 8)
13 of 13 reports included a week 8 score
Would Continue Protocol
13 of 13 reports included this response
Reported Goals
Commonly Reported Effects
Percentage of reports mentioning each effect
Based on 13 self-reported experiences. This is community data, not clinical evidence. Individual outcomes vary. Discuss any intervention with your healthcare provider.
13 reports from women who tried Selenium
Selenium wasn't for me. After 10 weeks of trying, my hypothyroid symptoms alongside menopause were much the same. My GP suggested trying a different approach.
Selenium has been really helpful for my thyroid and hormonal symptoms combined. I noticed I noticed a subtle improvement fairly quickly. the symptoms were about 70% better over the following weeks. Best decision I made for my health.
After 8 weeks on Selenium, I'd say it made a modest difference to my fatigue and weight gain from thyroid issues. Hard to tell if it was this or other lifestyle changes. Worth trying but manage your expectations.
After 12 weeks on Selenium, I'd say it made a modest difference to my thyroid medication adjustments. Hard to tell if it was this or other lifestyle changes. Still deciding whether to continue.
I gave Selenium a fair trial for my hypothyroid symptoms alongside menopause. Some improvement in sleep got better but sleep didn't improve much persisted. It might work for others but was modest for me.
Research context compiled from published sources
Incorporated into selenoproteins including glutathione peroxidase (antioxidant defence), iodothyronine deiodinases (T4 to T3 conversion), and thioredoxin reductase (redox balance). In the thyroid, selenium supports hormone conversion and protects thyroid cells from oxidative damage. May modulate immune response in autoimmune thyroiditis.
Well Studied
Extensive human research over many years, including randomized controlled trials.
Unknown
Dose ranges from published research. Individual dosing should be determined with your healthcare provider based on your specific circumstances.
Factual research context from published sources — not a safety assessment or recommendation. Research classifications may change as new data emerges.
Other Supplement tracked on Narrated.
Data last updated: March 27, 2026