Supplement warning: Overdosing on this mineral can trigger hair loss
SUPPLEMENT sales are on the rise and range of vitamins and minerals available for us to take in tablet or capsule form is fast expanding. Selenium can help reduce risk of cardiovascular disease and cancer, but it's possible to take too much of it.
Supplement overdose: Selenium helps your immune system function
Selenium is a mineral known to help the body's immune system function properly, and also works to prevent damage to cells and tissues, according to the NHS.
It does this by creating an essential antioxidant for your body.
Additionally, the mineral may ward off some cancers, cardiovascular disease and thyroid disease.
Research has shown a reduction in lung, colon and bladder cancer.
Supplement overdose: Brazil nuts are rich in selenium
In fact, a single brazil nut is said to contain an entire day's recommended allowance of selenium.
Selenioum is found in a number of foods.
Dietary sources include brazil nuts, fish, meat and eggs.
In fact, a single brazil nut is said to contain an entire day's recommended allowance of the mineral.
The NHS recommend men get 0.075mg a day, while women have 0.06mg a day.
Supplement overdose: Low levels of selenium have been associated with thyroid disease
However, in some cases people may need to take selenium supplements.
For example, the British Thyroid Foundation suggest taking them could be helpful for patients with mild thyroid eye disease.
Additionally, HIV patients and those with Crohn's disease may struggle to get enough due to problems absorbing nutrients from food.
Additionally, you may need to take them because you are deficient in the mineral.
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Supplement overdose: Symtoms of selenium deficiency include fatigue and a foggy brain
Deficiency can lead to Keshan disease, which may cause a weakening of the heart and is potentially fatal.
Symptoms of deficiency include hair loss or skin shedding, discolouration of the nails, feeling tired and a foggy brain.
However, on the other hand, consuming too much selenium can cause a condition called selenosis.
In its mildest form it can lead to - again - loss of hair, skin and nails.
The Department of Health warn that taking more than 0.35mg a day in selenium supplements could cause harm.