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Yes, you can give yourself Vitamin B12 shots

Mayo Clinic (2023)

Conclusion While vitamin B12 injections are effective and generally safe, rare but serious adverse effects such as hypersensitivity and anaphylactic reactions can occur, particularly with parenteral administration

Sterile equipment for administration: Use Sterile Needle & Syringe-Picture Courtesy: VIP Petcare Sterile equipment like needles, syringe should be used while administering vitamin b12 injection for dogs

Vitamin B-12 1mg/mL is a nutritional wellness compound researched for energy metabolism, nervous system function, and cellular health

[25] Administration Instructions Intramuscular Injection Instructions Subcutaneous Injection Instructions 503A vs 503B 503A pharmacies compound products for specific patients whose prescriptions are sent by their healthcare provider