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These can lead to side effects or reactions that you may then associate with the B12 itself, even though B12 has nothing to do with them

Vitamin B12 is essential for the formation of red blood cells and the proper functioning of the nervous system
Hepatology 2012;56:727-34

Lack of absorption and genetic factors may also contribute to vitamin B12 deficiency

B12 Injections B12 shots (injections) deliver vitamin B12 directly into the muscle, bypassing the digestive system

Unfortunately, as we age, we lose the ability to naturally produce Glutathione at high levels, leaving our bodies susceptible to illness, injury, or inability to heal
