@edgarblythe,
Nitric oxide, interesting supplement Edgar.
I am now doing red light with near infrared therapy.
Anyork Red Light Therapy, Infrared Light Therapy Device for Joint Pain,660nm and 850nm Near Infrared Therapy with Timer, 120 LEDs
https://smile.amazon.com/gp/product/B098QH76D7/ref=ppx_yo_dt_b_asin_title_o02_s00