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 .