Country music legend Willie Nelson has pal George Clooney to thank for his health after tearing his rotator cuff.

The singer admits he was left paralyzed and unable to play golf or the guitar for weeks until Clooney recommended a pioneering German treatment, called Regenokine.

Nelson tells Rolling Stone, "The doctor took some blood out and recharged it and made it with, like, 150 per cent more healing power, then he stuck it back in there. It really works. I'm in great shape."