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Selenium could flood your body with energy, restore vitality to your joints and mind, and protect against mental decline, thyroid problems and cancer.  In addition, it could also flush away heavy metals from your system.

Like garlic, selenium grabs hold of heavy metals like mercury, lead, cadmium, and arsenic and prevents them from damaging cells and tissues inside your body.  Countless studies show that selenium protects tissues from heavy metal toxicity.

Other studies have shown that selenium protects the mitochondria in our cells, which helps your cells to operate at their peak, in turn, boosting your energy level, mood and overall health.  It also supercharges your immune system by creating antibodies that fight illness, and prevents free radical damage.

Reduce risk of aggressive prostate cancer by 40%
Simple and inexpensive way to prevent prostate cancer is to add selenium to your diet. 

How much? Take enough to have a blod serum level of 135 ng/ml, will reduce your risk by 15%.

Less aggressive prostate cancer can be easily controlled with herbs, nutrients, and diet. However, having enough selenium in your body wil reduce your chance of having an aggressive from by huge of 40%.

When blood level of selenium is high as 170 ng/ml, the risk is reduce even further.

Bottom Line: take enough selenium to get your blood levels between 135-170 ng/ml. There is no advantage to levels higher than this. 

Best form of selenium is methylselenocysteine.  Start off at two tablets (200 mcg/tablet) and then check your levels after two months.

This is the results from twelve different studies from Norwich Medical School in the United Kingdom with 13,254 men.²

Other recommended dosage: 200 mcg daily as solium selenite. Not sure format which is better. 

*DV = Daily Value. DVs are reference numbers developed by the Food and Drug Administration (FDA) to help consumers determine if a food contains a lot or a little of a specific nutrient. The DV for selenium is 70 micrograms (mcg). Most food labels do not list a food's selenium content. The percent DV (%DV) listed on the table indicates the percentage of the DV provided in one serving. A food providing 5% of the DV or less is a low source while a food that provides 10–19% of the DV is a good source. A food that provides 20% or more of the DV is high in that nutrient. It is important to remember that foods that provide lower percentages of the DV also contribute to a healthful diet. For foods not listed in this table, please refer to the U.S. Department of Agriculture's Nutrient Database Web site.

Reference:
1. http://www.advancedbionutritionals.com/Products/Advanced-Detox-Formula.htm
2. Hurst R, Hooper L, Norat T, Laur, et al. Selenium and prostate cancer: systematic review and meta-analysis. Am J Clin Nutr. 2012 Jul:96(1):111-22
3. U.S. Department of Agriculture, Agricultural Research Service. 2011. USDA National Nutrient Database for Standard Reference, Release 24. Nutrient Data Laboratory Home Page, http://www.ars.usda.gove/ba/bhnrc/ndl.