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Urinary or plasma methylmalonic acid (MMA), a substance produced in the body thats dependent on B12, is also helpful for detecting early stages of B12 deficiency

Many patients begin to feel better within a few days of starting injections, with more significant improvements noticeable after a few weeks

In addition, a deficiency of vitamin B12 can cause facial signs such as hyperpigmentation (dark spots), vitiligo (white patches where skin loses color), or angular stomatitis (inflammation at the corners of the mouth)

Addressing the Core Question This is where things get interesting, and the short answer is: yes, you can take B12 tablets as well as injections, but crucially, this should always be under the guidance of a healthcare professional