Selenium

Selenium supplements support immune function, act as a powerful antioxidant to protect cells from oxidative damage, and are crucial for proper thyroid hormone metabolism. They may also reduce inflammation and lower the risk of certain chronic diseases when taken at appropriate doses.

The recommended daily allowance (RDA) for selenium is 55 mcg for adults, with an upper limit of 400 mcg to avoid toxicity. Higher doses may be used short-term under medical supervision, but excessive intake can lead to adverse effects like hair loss or gastrointestinal issues.

Yes, selenium is essential for thyroid function as it helps convert thyroid hormones (T4 to T3) and protects the thyroid gland from oxidative damage. Some studies suggest it may benefit people with Hashimoto's thyroiditis, but consult your doctor before supplementing.

Excessive selenium intake (above 400 mcg/day) can cause selenosis, with symptoms like hair loss, brittle nails, nausea, fatigue, and nerve damage. Long-term overdose may lead to more serious complications, so stick to recommended doses unless directed otherwise by a healthcare provider.

Selenium may interact with certain medications including blood thinners (like warfarin), some chemotherapy drugs, and medications that lower cholesterol. It's important to discuss selenium supplementation with your doctor if you're on any prescription medications.

Brazil nuts are the richest source (just 1-2 nuts can meet daily needs), followed by seafood (tuna, halibut, sardines), organ meats, poultry, eggs, and sunflower seeds. Soil selenium content affects plant-based sources, so levels vary by region.