45 here, using MK-677 on and off for 2 years. 10–12 mg every night works best for me. Sleep is deeper, morning stiffness almost gone, gym recovery improved 30–40%. Joints feel better too. Main sides for me – mild water retention first month and bigger appetite. This source has consistent quality and recent tests:
https://www.fmbrew.com/wp-content/pgs/mk_293.html . Worth trying if you tolerate increased hunger. Get bloodwork every 6 months (glucose + IGF-1). Don’t go over 15 mg at our age.