5 Incredible Selenium Benefits

September 12, 2020

You know how important vitamins are to your overall health and wellbeing. But did you know that minerals are just as important? In fact, one mineral—selenium—is crucial for many areas of your health. Selenium benefits everything from reproduction to thyroid health to immunity!

Given its far-reaching health benefits, it only stands to reason that selenium intake should be a priority in your daily diet. So, let’s review exactly what selenium is, how it works in your body, and a few of the incredible selenium benefits you can expect from incorporating more of this mineral in your diet.


All About Selenium

There are several minerals that your body needs to function but can’t produce on its own. As a result, you need to consume them each day from your diet.

These minerals are known as “trace minerals,” and though you only need small amounts each day, they have very big roles in your body’s ability to function and remain healthy. And selenium is one of these important trace minerals.

The majority of the selenium you consume is stored in your skeletal muscle, though small amounts can also be found in your hair, nails, and blood. [1]

Selenium plays a critical role in many areas of the body, such as supporting DNA synthesis, thyroid health, and reproduction. It even helps fight infections. [2]

To help take advantage of the many selenium benefits, the recommended daily allowance (RDA) for adults is 55 mcg. Meanwhile, pregnant women require 60 mcg while those who are breastfeeding need about 70 mcg each day.

Top 10 Food Sources of Selenium

Now that you know what selenium is and why it’s so important for your body’s essential functions, let’s take a look at the foods that contain the most selenium.

While you’ll notice that many of these foods are animal-based, I want to encourage you to prioritize the plant-based foods on this list, since they’re less likely to cause inflammatory responses upon consumption.

  1. Brazil nuts
  2. Sunflower seeds
  3. Cashews
  4. Lentils
  5. Brown rice
  6. Eggs
  7. Fish and shellfish (such as tuna, halibut, sardines, and shrimp)
  8. Ham
  9. Beef
  10. Poultry

Interestingly, of all foods listed above, brazil nuts contain the most selenium by far. In fact, a single ounce of brazil nuts (about six to eight nuts) contain 544 mcg per serving. That’s almost 10 times the amount the average adult needs each day!

It’s also worth noting that you can choose to take a quality selenium supplement if you’re concerned about a selenium deficiency.

Let’s now take a look at some of the top selenium benefits you can expect from consuming selenium-rich foods.

5 Selenium Benefits 

Here are five of the top selenium benefits to look for when increasing your selenium intake.

1. Aids reproduction

Believe it or not, one of the primary selenium benefits is its ability to support reproductive health.

In fact, several scientific reports have noted that a deficiency in selenium is linked to infertility, miscarriage, preeclampsia, preterm labor, gestational diabetes, and more. [3]

Furthermore, a 2015 study showed that selenium levels are higher in large healthy ovarian follicles. As a result, the researchers surmised that selenium could perform vital antioxidant functions for the ovaries during later follicular development. [4]

2. Supports thyroid hormone metabolism

Another one of the major selenium benefits is that it supports your thyroid function. In fact, of all the organs in your body, your thyroid gland contains the highest amount of selenium per gram of tissue. [5]

So, how does selenium support thyroid health? Well, studies have shown that when patients with autoimmune thyroiditis supplement with selenium for three months, they experienced reduced thyroid antibody levels and improved thyroid ultrasound features. [6]

The patients even reported better mood and general wellbeing, resulting in improved quality of life.

Additionally, a 2011 study revealed that selenium benefits the thyroid by lowering the risk of enlargement. According to the study, being low in selenium increases the risk of developing both an enlarged thyroid gland and multiple thyroid nodules. [7]

3. Helps control dandruff

Amazingly, selenium benefits also extend to supporting the health of your skin—specifically, your scalp.

Researchers have found that applying selenium sulfide topically to the scalp can help to control dandruff. This effect is achieved thanks to selenium sulfide’s anti-fungal properties. [8]

In fact, according to a study on 180 patients with moderate-to-severe dandruff, 93 percent of the patients reported significant improvements in dandruff. After two months, 88 percent reported that the improvements remained. [9]

There are many selenium sulfide shampoos on the market today, so if you find that you’re in need of some anti-dandruff support, consider trying one for a little relief.

4. Supports immune system health

Perhaps of significant interest right now is the fact that selenium benefits immune system health as well.

It’s long been known in the scientific and medical communities that having adequate selenium levels are crucial for maintaining optimal immunity. But they also help to regulate immune responses and chronic inflammation to keep either from overacting.

Studies have shown that selenium positively impacts the barriers to infection in the immune system, while a selenium deficiency impairs their function. [10]

Specifically, selenium has been shown to strengthen the body’s epithelial barriers (barriers composed of epithelial cells, tight junctions, and a mucus layer that not only regulated nutrient absorption but also helps stop invasive bacteria from entering the body.

Additionally, selenium deficiency has been linked to a higher risk of contracting viral illnesses, such as the flu.

In fact, studies have shown that being deficient in selenium results in greater lung problems in those with the flu than in those who have adequate amounts of selenium in their bodies! [11]

5. Fights oxidative stress

Finally, selenium benefits your body by also fighting oxidative stress. As you may recall, oxidative stress is an imbalance of free radicals and antioxidants in your body that leads to cellular damage.

Because it’s often caused by inflammation, it’s linked to the development of many of today’s chronic illnesses, such as diabetes, heart disease, cancer, and more. And since selenium is a powerful antioxidant, it’s known to help fight the free radicals that cause oxidative stress.

Accordingly, studies have found that supplementing with selenium can help to reduce DNA damage and even reduce cancer risk!

In fact, a 2016 meta-analysis revealed that having high selenium levels was linked to a decreased risk of breast cancer, lung cancer, esophageal cancer, gastric cancer, and prostate cancer. [12]

Additionally, according to 2019 study on 94 patients with type 2 diabetes, supplementing with 200 μg of selenium daily helped to improve their glycemic and lipidemic profiles. [13]


Selenium benefits - Dr. Pingel


As you can see, because selenium benefits so many body functions, including selenium-rich foods in your diet is a great way to support your overall health and wellbeing.

You can start by simply eating a few brazil nuts each day or consider taking a supplement if you have a nut allergy. Either way, you’ll be supporting your body’s essential functions, which will help to set you up for optimal health!


Key Takeaways

  • The trace mineral selenium is crucial for many areas of your health.
  • Some of the top selenium benefits include aiding reproduction, supporting thyroid hormone metabolism, helping control dandruff, supporting immunity, and fighting oxidative stress.
  • There are many great food sources of selenium. Try to stick to plant-based sources such as brazil nuts for the maximum benefit.
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