can b12 injection cause fever Are Vitamin Shots Right for You? Vitamin B12 shots: Uses, benefits,

Early signs may be mild, but they can get worse if not treated

A 2025 paper published in BioImpacts confirmed topical GHK is increasingly being studied as a clinical anti-aging compound with hair restoration applications and that injectable forms are now entering clinical interest following the FDA's April 2026 decision to remove GHK-Cu from the Category 2 restricted list

1- Ice the injection site Before injecting with vitamin B12, apply ice to your thigh, hip, or groin- wherever you plan on inserting the needle

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