Suspended Canberra winger Earl was last month issued an infraction notice, having admitted to the use and trafficking of CJC-1295, a substance that triggers the release of growth hormone.
Earl broke his silence in a wide-ranging interview with the Nine Network on Thursday night, saying Dank told him explicitly that he had used CJC-1295 with players at a number of other clubs.
"Just like in my (ASADA) interviews, unfortunately I'm not going to comment on hearsay or things I heard," Earl said, having admitted he was injected with peptides CJC-1295 and thymosin.
"But what Dank did and what his job involved, I believe it was peptides.
"...Yes (he told me had used CJC-1295) at other clubs.
"Of course now, you say he had problems with every (club) doctor and he got kicked out of the clubs. But back then there was no word of him doing anything wrong.
"...I didn't know of (specific players using CJC-1295). But I knew it went on, there's no doubting that."
Dank spoke of his ties with NRL clubs Cronulla and Manly, and AFL side Gold Coast, when he first treated Earl's shoulder injuries in 2011 while the winger was with Penrith.
"(There was) a discussion of treatments he could provide ... he was telling me of things he could do to reduce my injury time by three months ... the success he'd had before," Earl said.
"Of course that was very appealing."
Earl, who is facing a four-year suspension, said he asked Dank "more than once" whether the peptides were banned under Australian Sports Anti-Doping Authority's prohibited list.
"He assured me on a number of occasions it wasn't banned," Earl said.
"I raised it with Dr (Ijaz) Khan then (at the off-site private clinic he was injected at), who also assured me these substances aren't prohibited."
Earl said Dank told him in the consultation rooms at Penrith that "we probably shouldn't be telling everyone about this" and that it would be "too much" for the club doctor to "worry about".
"That pictures me as a bit naive," Earl admitted.
The 24-year-old was adamant he did not "obtain any further performance ora anything like that, that classifies me as a drug cheat".
Earl also questioned why the Panthers didn't ask more questions of Dank's methods.
He said alarm bells only started to ring about his indiscretion when the Australian Crime Commission (ACC) released the Organised Crime and Drugs in Sport report in February this year.
Dank has repeatedly denied ever giving athletes banned substances.