vitamin b12 injection how often to take Should You Get Injections? how often do you take

But the form matters

This is the same mechanism that supports tissue repair, but it is a meaningful contraindication for anyone with active or recent malignancy

The liquid form helps it absorb quickly, making it a convenient choice for everyday energy support

According to the National Institutes of Health (NIH), vitamin B12 supports a healthy central nervous system, red blood cell formation, and the synthesis of genetic material like DNA [1]

Following the CDC guidance of a 28-day refrigerated-use window, that works out to three 80 mg vials at the low 1.6 mg dose, three vials at the standard 3.2 mg dose, or four vials at the elevated 4.8 mg dose