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(15) Studies show us that dairy is a better source of B12 than fish, poultry, and meat

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

Improvements in red blood cell count could take months of regular b12 shots to see improvement

A routine blood test can detect whether you are deficient in vitamin B12, and medical history or other exams or procedures can help find the underlying cause of the deficiency