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As long as you are not experiencing severe neurological symptoms, high-dose daily pills can normalize and maintain your B12 levels just as well as shots [3] [4]

Once a protein is denatured, it does not un-denature

According to Harvard Health Publishing, there is no solid scientific evidence that getting enough vitamin B12 can prevent health conditions like heart disease, Alzheimers disease, infertility, eczema, and fatigue

Following injection of lambs with 1mL from 3 weeks of age (at tailing), vitamin B12 levels would be expected to be maintained at adequate concentrations for 180 days (4.5 months), and in some cases up to 200240 days (5-6 months)