No, Barry Bonds never took steroids:

From the book Game of Shadows:

"Since joining the Giants, Bonds had gone from a size 42 to a size 52 jersey; from size 10 ½ to size 13 cleats; and from a size 7 1/8 to size 7 ¼ cap, even though he had taken to shaving his head.."

Full grown men don't do that. At least they're not supposed to.