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Adensylcobalamin is also vital in the creation and maintenance of the myelin sheath, which protects nerve cells and your brain, which methylcobalamin cant achieve (Thakkar and Billa, 2014)

Other tests they may do include: Advertisement Since vitamin B12 absorption is blocked, your healthcare provider may prescribe intramuscular vitamin B12 injections

Once levels are restored, you may experience sharper concentration, better memory, and improved mental clarity

Other more sensitive tests are now available, which test for serum methylmalonic acid and serum homocysteine levels

Carnitine: fact sheet for health professionals