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How bioavailable or in other words, how absorbable a vitamin is is often influenced by factors, like age, genetics, and a persons digestive system ( For example, people with conditions affecting the digestive system might not benefit from liquid, gummy, or pill forms of vitamin B12

As we get older, our ability to absorb nutrients through digestion decreases

Never use non-sterile water for reconstitution

Tumors: Cancerous or benign, tumors can cause spinal stenosis by growing from within the spinal cord, or from one of the nerve roots that arise from the spinal cord

Most B12 injections are 1000 mcg/mL, but there are other options too