Selenium is widely praised for thyroid, energy, and antioxidant benefits, though reviews are scattered across brands with mixed brand-specific experiences.
NOW Foods Selenium 200mcg delivers selenomethionine, an organic, amino acid-bound form of selenium that supports antioxidant enzyme activity, thyroid hormone metabolism, and immune function. At 200mcg per serving, this is a standard clinical dose for adults seeking to maintain adequate selenium status, particularly those with dietary gaps or living in selenium-depleted regions.
Why It's Worth Considering: Selenomethionine is among the better-absorbed forms of selenium compared to inorganic selenite, and NOW Foods maintains NSF certification for manufacturing quality.
For maintenance: 100-200mcg daily (selenomethionine form preferred). For thyroid support: 200mcg. The RDA is 55mcg but most functional medicine practitioners recommend 100-200mcg. Do NOT exceed 400mcg/day — selenium has a narrow therapeutic window and excess causes selenosis (hair loss, nail brittleness, GI issues).
Yes — selenium is critical for thyroid function. It's required for the enzyme that converts inactive T4 to active T3, AND it protects thyroid cells from oxidative damage. In Hashimoto's, 200mcg selenium daily reduces TPO antibodies by 20-40% in clinical trials. It's one of the most evidence-based supplements for thyroid health.
One Brazil nut contains 70-90mcg selenium — so 2 nuts/day provides a therapeutic dose. However, selenium content varies dramatically by soil (some nuts have 10mcg, others have 300mcg). If you rely on Brazil nuts, be cautious about overconsumption — 4-5 large nuts could exceed 400mcg. A supplement provides a consistent, known dose.
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No significant interactions identified. Always consult your healthcare provider.
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
