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The lack of regulatory oversight for these compounds means purity, potency, sterility, and batch-to-batch consistency may vary significantly between suppliers

Medically reviewed by Alan Lucks | MD , Alan Lucks MDPC Private Practice - New York on February 9th, 2026

Adding to the complexity is the overwhelming market of weight loss aids, many of which lack scientific validation or come with a host of unwanted side effects

Your health care provider may prescribe an over-the-counter vitamin B12 supplement

You should expect some initial, short lived, discomfort from the injection

Choose a clinician who will titrate slowly, monitor labs and symptoms, and plan cycles rather than indefinite use