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How Long Does a B12 Shot Last research-longevity https://www.xcelpeptides.com/wp-content/uploads/2025/06/5-Amino-1MQ-10mg-chloride-Lyophilized-Vial-600x600.png Replacing B12 in someone who is deficient is well established and can reverse anemia and, if caught early enough, nerve symptoms Dosage:20mg