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People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms

Often, people will notice the effects of B12 injections within 24 to 72 hours after their first dose

This essential vitamin has the potential to rev up your metabolism and contribute to body fat management

He came up with the idea after treating young boys with Frhlich syndrome, a rare hormonal disorder that causes obesity

For more information on Vitamin B12 deficiency and treatment, check out theNational Center for Biotechnology Information