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You cannot have a vitamin B12 injection if: You are sensitive to any of the excipients, which are - acetic acid, sodium chloride, sodium hydroxide, and water for injections

You can tailor the concentration to whatever works best for your measurement system

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No long-term safety data beyond 6 months

Cost-Effectiveness 150 mcg: Beginner/maintenance 300 mcg: Balanced 500 mcg: Goal-specific Quality Tips Seek third-party tested, lab-verified sources to avoid impurities