Trace Minerals Research Ionic Selenium 300 mcg

Our assessment

The evidence shows that Trace Minerals Research Ionic Selenium 300 mcg provides a high dose of selenium. The Tolerable Upper Intake Level (UL) for selenium is 400 mcg per day for adults [NIH ODS]. Data not available on the specific efficacy of this brand or form.

How it works

Selenium is a trace mineral that supports antioxidant function and thyroid hormone metabolism [NIH ODS]. Data not available on how the ionic liquid form in this specific product compares to other forms.

Safety profile

Data not available on adverse event reports submitted to FDA for this specific product. Chronic intake above 400 mcg per day can lead to selenosis, with symptoms including garlic breath, hair loss, and nail brittleness [NIH ODS].

Our recommendation

Given that 300 mcg is close to the UL of 400 mcg, you should not combine this supplement with other selenium-containing products. Consult a healthcare provider before use, as the margin for safety is narrow [NIH ODS]. Data not available on drug interactions.

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide