can b12 injection cause constipation

J Hepatol Choose Your Bundle:2 Pack | 4oz size https://www.worldwideintegrative.com/wp-content/uploads/2025/08/b12.jpg.webp Low b12 Neurological function Vitamin B12 supplements and injections are extremely common, but not everyone needs them. Weakness, tingling, fatigue, or low energy can have many causes like iron deficiency, thyroid problems, stress, or poor sleep —

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