why do b12 injections cause joint pain I feel worse after a injection? Best Vitamin B12 Injection Sites:

5-amino-1MQ acts as an inhibitor of an enzyme called NNMT that degrades a nicotinamide adenine dinucleotide (NAD+) precursor called nicotinamide, which is also a precursor of nicotinamide mononucleotide (NMN)

Some clinics also refer to formulations that include additional compounds as liver detox injections, given the role these nutrients play in supporting hepatic fat metabolism and detoxification

"Interim Clinical Considerations for COVID-19 Vaccines: Bivalent Boosters" (PDF)

Is a B12 injection painful

Upper outer buttocks In some cases, you might be instructed to inject hCG directly into the muscle on the upper outer part of your buttocks, near your hip

It has not received MHRA approval, there is no UK SmPC, and it is not available through NHS prescribing pathways