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Levels of B12 along with methylmalonic acid (MMA) and homocysteine are usually measured to detect the B12 deficiency [2]

Current opinion in clinical nutrition and metabolic care , 13 (1), 2427.

However, if there are neurological symptoms that have arisen due to B12 deficiency, they could take up to three months to improve, with mild improvements occurring in the first six weeks

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People with Digestive Disorders: Conditions like Crohns disease, celiac disease, or those who have undergone weight loss surgery can impair the absorption of B12