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Key Takeaways Injections bypass common absorption issues : If youre not feeling the benefits of a B12-rich diet or oral supplements, it might be because your body cant properly absorb the nutrient

Lethargy Muscle weakness Mood swings Memory loss Tingling in the fingers and toes Weight gain Though B12 is found in many different foods, including meat, eggs, and fortified grains, it may be difficult to get enough of this nutrient from your diet, especially if you are following a specific diet for weight loss

But if you have a 500 g supplement and only want to take B12 once a week, you can add 5 of them together to equal 2,500 g and match our EFSA recommendation

Vitamin B12 shots should only be administered by a doctor or other medical professional