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Selenium

Also known as Selenomethionine, Sodium selenite

What it is: Essential trace mineral and antioxidant cofactor
What it does: Incorporated into selenoproteins such as glutathione peroxidases and thioredoxin reductases
Status: Widely used supplement
Evidence: Moderate. Extensive human data.
Uses: Thyroid and immune support; antioxidant protocols

Caution. Narrow safe range; chronic high intake can cause selenosis (hair/nail changes, GI and neuro symptoms).

Summary

Selenium is a trace mineral that becomes part of selenoproteins involved in antioxidant defense, redox signaling, and thyroid hormone metabolism. It is often used to support thyroid and immune function, particularly when dietary intake is low. The safe range is relatively narrow, and long-term high intake can lead to selenosis with hair, nail, and neurologic changes.

Checked Jul 19, 2026.

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This entry summarises published information in plain language. It is not medical advice, a dosing recommendation or a substitute for a qualified healthcare professional. Many peptides are not approved for human use, and legal status varies by country. Check anything you rely on against primary sources.