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About product and suppliers:
        Alibaba.com offers 7,318 vitamin b12 products. About 34% of these are vitamins, amino acids and coenzymes, 9% are vitamins, and 4% are immune & anti-fatigue. 

A wide variety of vitamin b12 options are available to you, such as medicine grade, industrial grade, and cosmetic grade. You can also choose from free samples, paid samples. 

There are 7,378 vitamin b12 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United States, and Vietnam, which supply 94%, 1%, and 1% of vitamin b12 respectively. 

Vitamin b12 products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 2,030 with Other, 1,275 with ISO9001, and 924 with GMP certification.