stronger joints and harder muscles for the fighter

i was curious....what should a fighter (new to supplements and steroid use) take if he wants to gain stronger joints, denser muscles, an increase in tendon strength, speed and stamina, etc? Assuming that fighter is eating right, and does powerful weight training, tons of grappling and boxing, and average resting time. wanting injuries to heal faster (i.e. knee), and to avoid as much side effects as possible.
thanks and sorry if i made it too confusing

try some chondroiten or glucosamine , this is good for the joints

thanks presser, ill check it out...i heard about GLC 2000 so i think i'm going to order some of that since its a lot of glucosamine and other vitamins and minerals

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wow, thanks press, definitely check that out instead
thanks again