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About product and suppliers:
        Alibaba.com offers 3,238 selenium products. About 17% of these are other metals & metal products, 6% are immune & anti-fatigue, and 4% are vitamins. 

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

There are 2,904 selenium suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and United States, which supply 85%, 4%, 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 805 with ISO9001, 459 with GMP, and 364 with Other certification.