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I havent had any severe side effects, and I feel stronger overall

At 0.25mg per week, a single 5mg vial lasts 20 weeks

More experienced researchers may prefer higher concentrations for smaller injection volumes, but beginners benefit from the forgiving measurement margins of the 2mL ratio

Common signs include: Fatigue and weakness Neurological changes, such as numbness or tingling in the hands and feet Megaloblastic anemia, characterized by large, abnormal red blood cells Cognitive difficulties, including memory loss and confusion Early detection and treatment of B12 deficiency can make a big difference

PMC 3263877