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Most multivitamins contain a good amount of B12. Look at the informational label on your multivitamin to make sure it provides the B12 you need. You can also buy B12 supplement pills. B12 absorbs easier when it is taken along with other vitamins. Take it with B6, magnesium, niacin, or riboflavin. If you none of these methods work, you can try a B12 prescription from your doctor. This supplement comes in the form of an injection or a nasal gel.
Take a multivitamin. Take a separate B12 supplement. Get a B12 prescription.