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Vitamin B12 is one of the eight essential B vitamins crucial for maintaining good health
Once it is maxed out, anything left over has to rely on the second pathway, passive diffusion, where B12 simply seeps across the intestinal wall on its own
These are usually for people who are underweight or need to build muscle
The two mechanisms are complementary and their combination produces a documented synergistic effect (Ionescu & Bhatt, Endocrine 2006)
Although distinct differences exist between methylcobalamin and cyanocobalamin, both have beneficial effects on health and can prevent B12 deficiencies ( In fact, one study found that treating seven B12-deficient people with oral methylcobalamin normalized vitamin B12 levels in their blood within just 2 months ( Similarly, another study showed that taking cyanocobalamin capsules for 3 months also increased vitamin B12 levels in 10 people with pernicious anemia, a condition caused by impaired B12 absorption ( Both types of the vitamin may also provide other health benefits
