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Description
Researchers are exploring oral and nasal delivery systems, but none are commercially available

see Using Fat-Dissolving Injections That Are Not FDA Approved Can Be Harmful

Medical History Consult with your doctor before using vitamin B12 supplements if you have or have had iron deficiency anemia, potassium deficiency (hypokalemia), or folic acid deficiency

People with Digestive Disorders: Conditions like Crohns disease, celiac disease, or those who have undergone weight loss surgery can impair the absorption of B12