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Vitamin B12 is also important for DNA synthesis and your brain's and nerve cells' normal functions

this process involved denaturation, enzyme reaction, and thermal cycling to produce stable complementary DNA for subsequent analysis

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Methylcobalamin is the more potent form of vitamin B12 and used by your body to maintain a number of organ systems, metabolize cells, and even supportive of brain functions

These may include: Fatigue Brain fog Memory loss Neurological problems Heart palpitations Pale skin Muscle weakness Mood changes Appetite loss Constipation Infertility Side Effects of Vitamin B12 While the recommended daily amount of vitamin B12 for adults is 2.4 micrograms, higher doses have been found to be safe

It means it didn't work well enough as a standalone pharmaceutical drug