can b12 injections cause upset stomach Vitamin shots: Uses, benefits, and side effects Vitamin B12 Side Effects Stomach:

A healthcare provider will recommend the appropriate dosage based on the overall condition

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

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

Inject Monday through Friday, rest on weekends

Serious adverse reactions are rare when injections are administered by a qualified provider following proper clinical evaluation