Selenium is a trace mineral found in foods such as Brazil nuts, seafood, and organ meats. It plays an important role in immune health, acting as an antioxidant to help reduce cellular damage caused by free radicals. Studies have shown that low levels of selenium can lead to increased risk of illness and infection.

Fortunately, there are several dietary supplements available that can help boost your selenium levels to ensure optimal immune function. In this article, we'll take a look at five of the best selenium supplements on the market designed to help support your body's natural defenses against illness and infection.

We'll discuss each supplement in detail, including how much selenium it provides per serving and what other nutrients it contains that may help improve your health. We'll also examine the potential side effects associated with each supplement so you can make an informed decision about which one is right for you.

We hope you find your next favorite thing from the list below! Each product was independently selected by our editors. LucksList may collect a share of sales or other compensation from the links on this page if you decide to buy something (that's how we stay in business). We hope you find your next favorite thing!

Introducing Bronson Selenium 200 mcg, your natural go-to for immune system, thyroid & metabolism support! Backed by Albion Minerals-- the premier manufacturer of chelated minerals-- and laboratory tested non-GMO and gluten/soy free ingredients, this essential micronutrient is sure to provide superior quality to your body's needs. Selenium may play a key role in supporting a healthy immune system, helping the body properly regulate its metabolism and hormone levels, and acting as an antioxidant.

Check Price on Amazon

Introducing Nutricost Selenium 200mcg – your ultimate source of high-quality, easily-absorbed selenium! Selenium is an essential trace mineral that’s important for a healthy body and mind. Now, with our capsules, you can get all the benefits in a tiny pill! Just one capsule will give you 200mcg of selenium — tailored to help support energy levels, boost your metabolism, improve cognitive function, and protect against oxidative stress. Nutricost Selenium 200mcg also stands out from the rest with its all-natural vegan & vegetarian capsules that are non-GMO, soy free, gluten free and proudly manufactured in a GMP Compliant & FDA Registered Facility.

Check Price on Amazon

Futurebiotics Selenium 200 MCG provides your body with a superior quality trace mineral essential for immune and antioxidant health. This lab-tested formula is non-GMO, gluten-free, soy-free, and manufactured at our FDA/GMP registered facility in New York. And each tablet gives you an efficient way to add this key nutrient into your daily routine. Selenium has many roles within the body – it helps protect healthy cell function and provides valuable antioxidant protection by assisting normal cellular function.

Check Price on Amazon

Introducing NOW Foods Selenium! Our Selenium supplement offers you an easy, convenient way to get 200 mcg of this beneficial mineral per serving. Crafted in sealed capsules from pure, USA-sourced ingredients, NOW Foods Selenium is just what your body needs to gain the many benefits of this essential trace element. Selenium is a powerful antioxidant that helps protect cells throughout your body against oxidative damage, and also supports healthy DNA production and replication.

Check Price on Amazon

Introducing the Life Extension Super Selenium Complex: your secret weapon for achieving longevity! This unique selenium-rich supplement offers a powerful blend of three forms of selenium. Studies have found that selenium is present in those who are among some of the world's longest-living people - now you can get that same support with this incredible formula. More than just promoting long life, Super Selenium Complex helps your body combat oxidative stress which is a contributing factor to aging.

Check Price on Amazon

And those are our 5 best Selenium supplements for immune system, metabolism & thyroid support! Whether you're looking to improve your overall health or just make sure your body is getting the necessary nutrients it needs, these selenium-rich supplements are a great choice. Remember, as always, to consult with a physician before taking any new supplement.