what size needle do you use for b12 injection Injections at Home - Safety Guide Self-Administration size needle for b12 injection

B12 deficiency may occur due to poor diet, vegetarian/vegan lifestyle, malabsorption, aging, digestive disorders, or medications like metformin and PPIs

Bioavailability of B12 is dependent on specific conditions in the digestive tract

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Without this protein, your stomach simply cannot absorb B12, no matter how much you take orally