I've tried everything: foods increasing testosterone, supplements like L-Citrulline, high-intensity training - lifting, ginseng, maca, beet juice - nothing worked.
I tried sildenafil and tadalafil and both worked very well only a few first times - later the was a small or sometimes no response. My testosterone is high (810) and no smoking, not overweight, blood work works O.K.
I'm 56 years old. Any suggestions?