An Informative Overview of Selenium
Understanding Selenium
Selenium is a trace mineral that plays a crucial role as a component of the antioxidant enzyme glutathione peroxidase. Working alongside vitamin E, it helps protect cell membranes from damage caused by free radicals. Low levels of selenium have been associated with an increased risk of cancer, cardiovascular disease, inflammatory conditions, premature aging, and cataract formation.
The Antioxidant Benefits of Selenium
Maintaining optimal selenium levels is important for safeguarding against various health conditions due to its antioxidant properties. Studies have shown advantages in using selenium-rich yeast, such as SelenoExcell, to support antioxidant activity. In a controlled trial, participants taking SelenoExcell demonstrated reduced oxidative damage markers, while their blood selenium levels increased significantly.
Selenium’s Role in Cataract Prevention
Proper selenium levels are also vital for protecting against cataract formation. Research has shown that individuals with cataracts have lower selenium content in their lenses and higher levels of free radicals in the eye fluid. By maintaining adequate selenium levels, the risk of cataracts may be reduced.
Selenium and Heart Disease
Selenium has been associated with a potential protective effect against heart disease and strokes. Although the association is not as strong as with cancer, selenium supplementation has shown positive effects in preventing heart attacks. In a study involving heart attack patients, those supplemented with selenium-rich yeast experienced significantly fewer fatal and non-fatal heart attacks compared to the placebo group.
Enhancing Immune Function with Selenium
Selenium plays a role in all aspects of immune system function, including the development and activity of white blood cells. Deficiency in selenium can lead to impaired immune function, while supplementation has been shown to enhance immune responses. Even individuals with normal selenium levels can benefit from selenium supplementation, as it has been demonstrated to improve the ability of white blood cells to combat tumor cells and increase the activity of natural killer cells.
Selenium’s Importance During Pregnancy
Selenium is essential for proper fetal growth and development. Pregnant women may require increased selenium intake, as selenium concentrations in the blood tend to be lower during pregnancy, particularly in later stages. Low birthweight babies often exhibit low selenium levels, emphasizing the significance of maintaining adequate selenium intake during pregnancy.
Selenium and Thyroid Function
The thyroid relies on selenium for optimal function. Insufficient selenium levels in the thyroid have been associated with thyroid dysfunction. Unlike other tissues, the selenium content in the thyroid is not directly related to blood selenium levels. Ensuring an adequate dietary intake of selenium is crucial for supporting thyroid health.
Forms of Selenium in Supplements
Common forms of selenium in dietary supplements include sodium selenite, selenomethionine, and yeast-derived selenium. Studies have shown that organic forms of selenium, such as selenomethionine and selenium-rich yeast like SelenoExcell, are better absorbed and more biologically active compared to inorganic salts like sodium selenite. Therefore, selenium-rich yeast is considered the preferred form of selenium supplement.
Recommended Dosage and Side Effects
Typically, a daily dosage of 50 to 200 mcg of selenium is recommended. However, excessive intake above 900 mcg per day for an extended period may lead to selenium toxicity. Symptoms of chronic toxicity can include depression, nervousness, emotional instability, nausea, vomiting, garlic-like breath and sweat odor, and, in severe cases, hair and fingernail loss.
It is important to consult with a healthcare professional before starting any new supplement regimen and to follow recommended dosages to ensure optimal health and safety.