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Selenium

Selenium at a Glance

  • Primary Role: A powerful antioxidant that supports thyroid function and cell protection.
  • Classification: Mineral
  • Measurement Unit: mg
  • Best Taken:Anytime · With Or Without Food

Selenium Deep Dive

Selenium (Essential Trace Mineral)

Classification: Essential trace dietary mineral

Primary Roles: Glutathione peroxidase function, thyroid hormone activation, and antioxidant immune support.

Quick Summary

Selenium is a core trace mineral for antioxidant enzyme systems and thyroid hormone activation. Because food selenium depends heavily on soil geography, intake consistency can vary across regions even with similar diets.

Core Benefits

  • Thyroid Activation: Supports deiodinase enzymes that convert T4 to metabolically active T3.
  • Glandular Defense: Helps protect thyroid tissue from oxidative stress and immune-driven injury.
  • Immune Optimization: Supports intracellular antioxidant pathways involved in regulating viral stress and replication pressure.

Nutrient Web

  • Vitamin E: Functions in an antioxidant partnership where selenium-dependent enzymes and vitamin E protect complementary cellular targets.
  • Iodine: Selenium supports safe thyroid hormone metabolism during iodine handling by limiting oxidative burden.
  • Thyroid Hormone (T4): Requires adequate substrate hormone production for efficient T4 to T3 conversion.

Recognizing Deficiency

  • Persistent fatigue and metabolic slowdown
  • Brain fog and generalized muscle weakness
  • Hair shedding with worsening thyroid symptom patterns

How to Get It

Source Type Best Options Notes
Plant superfoods Brazil nuts Extremely dense source; portions should stay modest to avoid excessive intake.
Dietary staples Yellowfin tuna, canned pilchards, sardines Consistent marine sources with strong bioavailability.
Dietary support Beef liver, pasture-raised eggs Useful whole-food support for steady selenium intake.

Testing and Target Ranges

Baseline testing helps avoid both deficiency and overshooting into excess when supplementation is considered.

  • Required Test: Fasting Serum or Plasma Selenium (Plasma Selenoprotein P where available)
  • Target Range: 90-120 mcg/L for practical thyroid and antioxidant support targets.

Males

Age Group RDA
9–13 years 40 mg
14–18 years 55 mg
19–30 years 55 mg
31–50 years 55 mg
50+ years 55 mg

Females

Age Group RDA
9–13 years 40 mg
14–18 years 55 mg
19–30 years 55 mg
31–50 years 55 mg
50+ years 55 mg
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