During the 1990s and early 2000s researchers began mapping the complex enzyme systems involved in cellular metabolism and biochemical regulation
But B12 supplements don't seem to have any effect on people already at normal levels
They might not absorb it as well
Upon taking a history, the woman, who had not suffered from acne before, had recently received 3 weekly injections of vitamin B12, administered privately by a nurse in a local beauty salon without any screening for vitamin B12 deficiency
Some individuals who have deficiencies caused by lack of absorption during digestion respond better to vitamin B12 injections as they are absorbed directly into the body
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