This has led to interest in its potential for neurological applications
AHK-Cu doesn't
J Invest Dermatol (1999) Skin care benefits of copper peptide containing facial cream Leyden JJ, Stevens T, Finkey MB
Dorn GW, Vega RB, Kelly DP
Resistance training (RT) has gained popularity, particularly among those prescribing exercise to the elderly, due to its positive effects on muscle strength, metabolism, bone density, and mobility, as well as its potential to reduce the risk and progression of osteoporosis, sarcopenia, frailty, and cardiovascular disease (Westcott, 2012)
Yes - the reasons for stinging are usually either swabbed area not dry, a drop of B12 at the tip of the needle (flick syringe and wait a moment) or B12 ampoule not warmed up just before injecting (especially if using fridge)