can b12 injections cause upset stomach Vitamin shots: Uses, benefits, and side effects Vitamin B12 Deficiency - Harvard

Liquid drops can be held under the tongue (sublingually), allowing a portion of the vitamin to be absorbed directly through the oral mucosa into the bloodstream, bypassing the digestive tract entirely

If youd like to take advantage of a lower price per vial, ensure a season-long supply, or hedge against future price increases, note the sweet discounts on the 3, 6, or 12-month kits

Endocrine Journal , 59(7), 529538

Plus, animal research suggests that vitamin B12 may affect body fat and metabolism

Oral supplements might not work, so injections or sublingual tablets are better

This promotes greater metabolic efficiency and shifts the body toward fat oxidation over fat storage