In 1990, the US Congress passed an omnibus crime bill, the Crime Control Act of 1990, that amended the Federal Food, Drug, and Cosmetic Act, that classified anabolic steroids as controlled substances and added a new section that stated that a person who "knowingly distributes, or possesses with intent to distribute, human growth hormone for any use in humans other than the treatment of a disease or other recognized medical condition, where such use has been authorized by the Secretary of Health and Human Services" has committed a felony
If you are a thyroid patient, the last thing you want to do is to use a low-quality formulation of B12 because it will just make it that much harder for it to get into your body (its already difficult enough as is)
We also offer private blood testing through our London laboratory partner so you can confirm your B12 levels before beginning treatment and monitor your response over time
National Institutes of Health
That is not a side effect or a mistake, but the expected result of taking the vitamin