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An injection places B12 into the muscle, where it bypasses the digestive step that some bodies struggle with

Methylmalonic acid (MMA)

Supplements Vitamin B12 supplements are available for those who may not get enough from their diet, such as vegetarians, vegans, and older adults who might have absorption issues

PubMed PMID: 16310594

This makes B12 injections a valuable tool for those concerned with heart health

Also, sadly enough, there also are many types of (chronic) diseases that require B12 injections, such as Pernicious Anemia, people with Crohns, celiac, and people with intestinal imbalances, such as intestinal tapeworms and excessive bacterial growth