Selenium is a nutrient that is naturally present in many foods, added to others and is also available as a dietary supplement in pill, powder and liquid form, explains Perri Halperin, a nutritional ...

Brazil nuts contain high levels of selenium that can cause toxicity and lead to symptoms such as digestive upset and fatigue ...

Holly has a degree in Medical Biochemistry from the University of Leicester. Her scientific interests include genomics, personalized medicine, and bioethics.View full profile Holly has a degree in ...

Medically reviewed by Femi Aremu, PharmD Selenium supports thyroid function and may prevent conditions like hypothyroidism.Selenium may boost the immune system by increasing T-cells and natural killer ...