A self-confessed liar who liked to brag, John Camilleri has admitted supplying trainer Sam Kavanagh with race day drenches.

But he has denied much of his original evidence to Racing NSW stewards who charged him on several counts relating to those drenches.

Well-known in harness racing circles, Camilleri has admitted supplying drenches and being present when his associate Mitchell Butterfield treated Ceda Miss on January 7.

But he said he was not at the stable when Butterfield drenched Midsummer Sun two days later, the day he won the Gosford Cup.

A swab taken from Midsummer Sun after the race tested positive to caffeine and showed high levels of cobalt sparking an inquiry which has had far-reaching repercussions.

Kavanagh, Camilleri, Butterfield and stablehand Michael O'Loughlan have all been charged along with Flemington Equine Clinic partner Dr Tom Brennan and practice manager Aaron Corby.

Brennan has also been charged in the Victorian cobalt cases against trainers Danny O'Brien and Kavanagh's father Mark.

Camilleri told the Racing NSW inquiry on Wednesday, he had not told the truth when he sent a text to an acquaintance saying he knew a Melbourne Cup winner had run on cobalt and EPO.

"I know a horse that won a Melbourne Cup on cobalt and EPO," Camilleri's text said.

"How do you know? was the reply.

Camilleri said he was "big-noting" and in fact had no such knowledge and knew nothing about cobalt.

The inquiry heard the recipe for the drenches was beetroot extract, 15 Beroccas, echinacea powder, sugar and eight aspirins.

Kavanagh said he stopped using the drenches when his partner Kelly Fawcett told him on January 17 she would leave him and take their baby with her.

But he maintained a relationship with Camilleri in the hope he would be given horses to train from a group buying horses overseas.

Camilleri, who admits to a friendship with prominent Melbourne harness racing owner Paul Sequenzia, recanted previous evidence Sequenzia was one of five people he tipped Midsummer Sun to win.

After Palazzo Pubblico won at Randwick on January 17, Camilleri sent a text to a media personality saying: "Those galloping Cs have to wake up a week before to outsmart us trotting grubs".

Asked by chief steward Ray Murrihy what he meant, Camilleri said: I didn't outsmart anyone. That's why I am here".

Camilleri said he had $200 each way on Midsummer Sun.

Butterfield will give evidence on Thursday.