vitamin b12 injection

A 250 mcg dose requires 1.25 mL, which exceeds the capacity of a standard 1 mL insulin syringe https://www.tiktok.com/api/img/?itemId=7265482187615767854&location=3&aid=1988&index=0 Why do I feel worse after a B12 injection? | CoLaz vitamin b complex Quantity:5 bottles

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