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About product and suppliers:
        Alibaba.com offers 3,240 selenium products. About 18% of these are other metals & metal products, 7% are immune & anti-fatigue, and 2% are feed grade minerals & trace elements. 

A wide variety of selenium options are available to you, such as free samples, paid samples. 

There are 3,086 selenium suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and United States, which supply 86%, 5%, and 1% of selenium respectively. 

Selenium products are most popular in Domestic Market, North America, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 826 with ISO9001, 375 with GMP, and 373 with Other certification.