There are also certain drugs and health conditions that can increase the likelihood of developing a B12 deficiency such as: alcohol abuse, antacid use, smoking, celiac disease, other digestive concerns, pregnancy, a strict vegetarian or vegan diet, and even natural aging
Mild fever
Most supplements provide 100% of the RDI for each B vitamin, adhering to the following ranges: Supplements containing much higher doses than the RDI are available, but its crucial to consult with a healthcare professional before starting such supplements
Injection site reactions: redness, swelling, or mild discomfort
Peptides are not supplements
According to a While B12 shots are necessary for some people who cannot absorb the vitamin in other ways, they have some risks and side effects