Vitamin B12 can be ordered to the United States for personal use. From FDA Compliance Manual:
In deciding whether to exercise discretion to allow personal shipments of drugs or devices, FDA personnel may consider a more permissive policy in the following situations:
- when the intended use is appropriately identified, such use is not for treatment of a serious condition, and the product is not known to represent a significant health risk;
There is more, but the gist is let people look after themselves how they see fit, but to protect against fraud and criminality.
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