b12 injections haymount Cyanocobalamin Vitamin Injection 1000 mcg — Mountainside Medical B-12 (Cyanocobalamin) Shot Therapy |

It is deliberately membrane-permeable, which is what lets it get inside cells and act on an intracellular enzyme

While many people obtain these nutrients through diet or oral supplements, injections are often recommended in cases where absorption is compromised or deficiencies are severe

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Supplements May Not Work Many over-the-counter supplements have ingredients that make them hard to absorb

LeWine, MD, Chief Medical Editor, Harvard Health Publishing

You are an older adult: Stomach acid production tends to decline with age, which can make it harder to absorb B12 from food and raises the risk of deficiency