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An intramuscular injection contains vitamin B12 only
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On a U-100 syringe, each unit is 0.01 mL, so each unit contains 25 mcg
Last reviewed: May 12, 2026 Last updated: May 12, 2026 Written by: Jay Hastings , CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
