Selenium is a trace mineral that belongs to the class of essential micronutrients, meaning our bodies require it in small amounts for proper functioning. Naturally found in soil, water, and certain foods like Brazil nuts, fish, and eggs, selenium plays a critical role in various bodily processes. It is most well-known for its antioxidant properties, which help protect cells from damage caused by free radicals. Studies have explored selenium's role in supporting immune function, promoting thyroid

How many studies on Selenium are available?

NutriVouch references 628 human studies on Selenium, all peer-reviewed and indexed on PubMed.

Is Selenium effective for Antioxidant Protection?

For Antioxidant Protection, Selenium has an effectiveness score of 7/10 — strong evidence supporting clinical use. Based on 13 relevant studies.

Is Selenium effective for Thyroid Support?

For Thyroid Support, Selenium has an effectiveness score of 7/10 — strong evidence supporting clinical use. Based on 15 relevant studies.

Is Selenium effective for Immune Support?

For Immune Support, Selenium has an effectiveness score of 6/10 — moderate evidence — works in some populations. Based on 17 relevant studies.

Is Selenium effective for Fertility Support?

For Fertility Support, Selenium has an effectiveness score of 5/10 — moderate evidence — works in some populations. Based on 12 relevant studies.

Is Selenium effective for Anti-Inflammation?

For Anti-Inflammation, Selenium has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 17 relevant studies.

Confidence level

Strong evidence

628 studies

Selenium

Absorption

✦Best absorbed when taken with food. Avoid taking with large doses of vitamin C, as it may reduce selenium absorption.

Daily Dose

⚖

Common dose: 100–200 mcg daily

RDA: 55 mcg

Upper limit: 400 mcg

Best form: Selenomethionine, Sodium selenite

Timing: With or without food

Excessive selenium can lead to toxicity; symptoms include garlic breath and hair loss. Consult a healthcare provider for high-dose use or if pregnant/nursing.

Effects

🍇 Antioxidant Protection

Food Sources

Brazil nuts544mcg per 28g
Yellowfin tuna92mcg per 100g
Sardines (canned in oil)45mcg per 100g
Ham (cooked)42mcg per 100g
Eggs20mcg per 100g