Benefits
- Acts as a powerful antioxidant, helping to protect cells from damage caused by free radicals and oxidative stress.
- Supports thyroid health by aiding in the conversion of inactive thyroid hormone (T4) to its active form (T3), which is important for regulating metabolism, energy production, and overall hormonal balance.
- Contributes to reproductive health, particularly in males, as selenium is important for sperm production and motility.
- Plays a role in immune function, helping to enhance the activity of immune cells.
Precautions
- While selenium is essential for health, excessive intake can lead to selenium toxicity, known as selenosis, which can cause symptoms such as hair loss, brittle nails, gastrointestinal disturbances, and neurological problems.
- The tolerable upper intake level for selenium is 400 micrograms per day for adults. Consuming selenium supplements beyond this level should be avoided unless under the supervision of a healthcare professional.
- Selenium toxicity can occur from both dietary sources and supplements, so it's important to be mindful of total selenium intake from all sources.
Fun fact
Selenium is incorporated into certain proteins in the body, called selenoproteins, which play critical roles in various physiological processes, including antioxidant defense, thyroid hormone metabolism, and DNA synthesis. One of the most well-known selenoproteins is glutathione peroxidase, which helps to protect cells from oxidative damage.