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Deficiency in vitamin B12 can cause symptoms such as fatigue, weakness, numbness or tingling, memory issues, and mood changes

IGF-1 elevation is the primary mechanism through which full HGH increases the risk of insulin resistance, fluid retention, and certain growth-related effects at high doses

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Here are the best vitamin B12 injection sites for each method: Subcutaneous B12 injection sites Usually, the best places to give yourself a B12 shot subcutaneously are the abdomen, thigh, and upper arm, as you can see in this illustration: Although not shown above, the buttock is another good site for B12 shots