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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
The bottleneck logic is worth stating cleanly, because it is what separates a coherent research pairing from wishful stacking
However, these injections will not work as well if you have a condition that interferes with your digestive systems ability to break down and absorb this vitamin
Vegetarians, vegans, and people who eat little animal protein may fall short
You may wonder how a pill or injection can help if your stomach is unable to properly absorb B12
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