are there any side effects of b12 injections Vitamin Injections: What You Need To Know 3 Rare But Serious Side

[73] [74] [75] It is synthesized by some bacteria in the gut microbiota in humans and other animals, but it has long been thought that humans cannot absorb this as it is made in the colon, downstream from the small intestine, where the absorption of most nutrients occurs

It may also enhance the activity of certain immune cells, which may ward off viruses and chronic disease such as cancer, according to a 2020 review in the medical journal, Nature (2)

Fatigue often improves within a couple of days after the injection

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