Severe reactions are rare but can occur
Specifically, this nutrient: Because it is involved in so many bodily functions that correlate to healthy energy levels, B12 is sometimes known as 'the energy vitamin.' When people don't get enough B12 through diet alone, they are likely to suffer from ailments such as megaloblastic anemia
Sublingual administration, which bypasses the gastrointestinal tract, appears to be equally effective as IM injections while being less invasive and more cost-efficientparticularly in patients with atrophic gastritis, post-gastrectomy status, or conditions that impair intrinsic factor-mediated absorption, where long-term intervention is often required
A Mayo Clinic review concluded that there is no solid evidence that vitamin B 12 injections provide an energy boost or aid weight loss
Using them together isn't necessarily bad, but it can overwhelm sensitive skin