how much b12 increases with one injection Vitamin Dosage: 7 Facts Adults Should Know Vitamin B12 shots: Uses, benefits,

Within 48 to 72 hours, your body will begin to make new red blood cells

When your B12 levels are low, you may experience: Chronic fatigue and weakness Difficulty concentrating or memory loss Tingling or numbness in your hands and feet Mood swings or increased irritability Pale skin and shortness of breath B12 injections are a direct, effective way to restore optimal levels for those with malabsorption issues (such as people with gastrointestinal disorders, vegetarians, or those taking specific medications)

After this initial phase, your provider may recommend maintenance injections every month or every few months, depending on your ongoing needs

Past oral B12 supplements didnt help due to impaired absorption