Vitamin B12 injections are generally safe, but some individuals may experience side effects, including: Pain or redness at the injection site Mild diarrhea Itching Nausea or vomiting Dizziness or headaches Hot flashes In rare cases, more serious reactions, such as allergic responses (rash, swelling, trouble breathing), can occur
Improved blood flow may deliver more oxygen and nutrients to working muscles, potentially enhancing performance, although clinical evidence for performance enhancement remains mixed
Even with optimal formulation, does GHK-Cu cosmetic need refrigeration storage when sold as a finished serum
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Role in high-intensity exercise: Supplementation may improve performance, such as strength and fatigue reduction, when taken at appropriate doses before or during prolonged exercise