what size needle to use for vitamin b12 injection Is this the right im injections? : r/B12_Deficiency what gauge needle to use

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Most research-supply guidance keeps reconstituted vials usable for about 3-4 weeks

Vitamin B12 is a major factor in the tryptophan production process

Journal of Nutritional and Environmental Medicine 2007 16:3-4, 212-226 doi=10.1080%2F13590840701791863 Catherine S

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[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