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About product and suppliers:
        Alibaba.com offers 5,243 vitamin d3 products. About 25% of these are vitamins, amino acids and coenzymes, 23% are vitamins, and 20% are animal pharmaceuticals. 

A wide variety of vitamin d3 options are available to you, such as medicine grade, food grade. You can also choose from free samples, paid samples. 

There are 5,230 vitamin d3 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United States, and India, which supply 87%, 3%, and 1% of vitamin d3 respectively. 

Vitamin d3 products are most popular in North America, Western Europe, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 959 with ISO9001, 697 with GMP, and 526 with Other certification.