Possible B12 injection side effects tend to be mild and short-lived, and may include: Injection site pain, redness, or swelling Mild itching Brief diarrhea (less common) A feeling of warmth after the injection Serious side effects are rare
In some cases, side effects are less about the peptide itself and more related to improper handling, overdosing, or contaminated sources from unverified suppliers
Cyanocobalamin 50 mcg Tablets Summary of Product Characteristics
In Canada, synthetic injectable peptides are generally regulated as prescription drugs under the Food and Drugs Act, and Health Canada has issued public advisories (April 2026 and earlier) cautioning that unauthorized injectable peptide products are illegal regardless of whether they are labelled 'for research use only.' Research-grade AOD-9604 supplied by Koipeptides is intended for in vitro laboratory study only and is not authorized for any human or veterinary application
But definitely better, it might just take time for your body to adjust to the B12
The Journal of Emergency Medicine
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