b12 injections at cvs Vitamin Tablets There is no question about it Nature's Bounty B-12 Sublingual Liquid,

In terms of GI side effects, nausea is very common, but it can also cause constipation, diarrhea, vomiting, and dry mouth

Unlike oral supplements, an injection delivers vitamin B12 directly into the body without relying on digestive absorption which can be reduced by age, certain medications such as proton pump inhibitors or metformin, or gastrointestinal conditions

The effects may last longer for some, while others may require more frequent injections to maintain consistent energy levels

This decreases production of intrinsic factor and secretion of hydrochloric acid in the stomach, two things that affect your body's absorption of B12