On their own, they won't produce dramatic results
Deficiency is more common than excess vitamin B12, but both are worrisome
The infrapatellar fat pad that provides cushioning can become inflamed and fibrotic
doi:10.1159/000053183 Heffernan MA, Thorburn AW, Fam B, et al
Why it was included in the FDA ban Melanotan II was banned for reported adverse effects like melanoma skin cancers, posterior reversible encephalopathy syndrome (a seizure and headache disorder), sympathomimetic toxidrome (symptoms of poisoning), and priapism (dangerous, prolonged erections)
Fast-response, professional medical staff