what happens if you inject b12 in the wrong place How to self-inject intramuscular vitamin - Overview What Happens If You Inject

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Although, further research is needed to support the claim

Second, medications that many older people take, like metformin for diabetes or proton-pump inhibitors for acid reflux, can also impact absorption. Are vegan or strictly vegetarian: Because most dietary intake of B12 comes from animal products, B12 supplements are recommended for people who eat a vegan diet or a vegetarian one with few eggs and dairy products

These various directions lead to different clinical endpoints and side effects

[3] mhra.gov.uk)