Moneybags Mel is shelling out a staggering $12,000 for each dose of living tissue shot into his bloodstream. So far, the "Lethal Weapon" star has had two injections — but “he’s desperate to live forever” and to get another treatment “once every six months,” said a friend. Gibson swears his dad, Hutton
, is living proof the therapy works. Hutton had crippling health issues before beginning the injections in 2013. He is now a spry 98 — and can walk without a cane! “Mel reckons it’s saved his dad’s life,” said the friend.