Poor sleep quality directly impairs healing
While a B12 supplement may not cause harm, Dietary Guidelines for Americans, a government publication that provides nutrition advice to the public, recommends getting most nutrients primarily from food and beverages
For comparative bioavailability data on subcutaneous vs intramuscular delivery of biologics, see the NIH review of subcutaneous biologic bioavailability
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Food and Drug Administration (FDA) DailyMed Label: Bacteriostatic Water for Injection (Provides official labeling, storage instructions, and preservative information) United States Pharmacopeia (USP) USPNF General Chapters & Monographs (Defines standards for sterile water for injection and pharmaceutical quality requirements) World Health Organization (WHO) WHO Good Storage and Distribution Practices (Guidelines for temperature control, sterility, and pharmaceutical handling) American Society of Health-System Pharmacists (ASHP) (Clinical guidance on sterile product handling and multi-dose vial use) FDA Guidance on Sterile Drug Products (Aseptic handling, contamination risk, and storage principles)
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