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About product and suppliers:
        Alibaba.com offers 9,108 vitamin b12 products. About 33% of these are vitamins, amino acids and coenzymes, 2% are antibiotic and antimicrobial agents, and 1% are anti-allergic agents. 

A wide variety of vitamin b12 options are available to you, such as free samples, paid samples. 

There are 9,004 vitamin b12 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and United States, which supply 94%, 1%, and 1% of vitamin b12 respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 1,999 with Other, 1,967 with GMP, and 1,964 with ISO9001 certification.