There are anecdotal reports of these supplements triggering the development of skin lesions in certain individuals, but this isnt the case for everyone, and in many cases, the root issue may be coming from another imbalance or ingredient, rather than the vitamin itself
It is not FDA-approved, is research-use-only, and is not for human consumption
Clin Cancer Res 27:27552763
Furthermore, delivering B12 directly into your bloodstream may also help your body absorb other nutrients and also assist with detoxifying your liver
These include: Mild nausea or digestive discomfort (more common with oral forms) Dizziness or lightheadedness Injection site irritation, redness, or swelling Possible changes in appetite These side effects typically go away on their own and do not pose long-term risks