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Yes, many people safely use substitutes of Key B12 PFS 1500 mcg Injection 1 ml for long-term treatment

The risk of developing a deficiency is reduced, and your levels are restored, with a methylcobalamin injection by manufacturers
Some protocols suggest treatments over several consecutive days to maximize uptake of the nutrient and receive the best overall benefit

However, due to the limited availability and high costs of the radiotracers, the application of imaging techniques for investigation of the brain delivery extent has been restricted