UFC's Tyron Woodley: 'Lots' of Big Celebs Are on Steroids, But Not Mark Wahlberg!

Mark Wahlberg might not be on 'roids, but there are a TON of Hollywood movie stars who are ... some of the biggest names in town, this according to Tyron Woodley.

The UFC champ -- who's also appeared in a bunch of big movies -- opened up about Hollywood's steroid habit on "The Hollywood Beatdown" after Wahlberg was called out by a PED kingpin ... revealing that he's met "lots of big-name, A-list actors that are openly on steroids."

But Tyron says he does NOT think Marky Mark is one of Tinseltown's PED pumpers ... and even if he is, explains why he shouldn't be shamed like all the juiceheads in pro sports.

Woodley also slams UFC star Nate Diaz, "nasty ass" Larry Nassar and the MULTIPLE Eagles fans who thought it was cool to punch a horse (it's not).