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A woman has died and two people have been released from hospital after they allegedly ingested a drink at a health retreat in a regional Victorian town near Ballarat.

A 53-year-old Ringwood North woman died at 'creative wellbeing centre' Soul Barn on Fraser Street, Clunes on Saturday after she allegedly ingested a drink and fell ill at about 12am.

It is understood the woman went into cardiac arrest and an ambulance was called but the woman passed away at the scene.

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Two other people were taken to Grampians Health Ballarat Base Hospital for observation.

They have since been discharged.

Police are investigating what unfolded and preparing a report for the coroner.

Detectives are probing whether a mushroom-based drink was consumed, but have not ruled out other potentially toxic substances, according to reports by The Age.

Toxicologist Dr Jonathan Karro told 9News the public needed to exercise caution with mushrooms.

"Whenever there's more than one person who seems to get ill following the ingestion of any substance… meal, especially mushroom containing, one needs to consider whether there was a toxic product… including a mushroom in whatever was ingested," Karro said.

"Everyone needs to be very careful… one of the most important pieces of advice I could offer is essentially never to go foraging for mushrooms."

Soul Barn is advertised as an alternative and holistic health service.

The business has not released a statement in relation to the incident but said in a post on its Facebook page on Sunday: "My deepest apologies – Sound healing is xld today – email with refund and details have been sent to all booked x".

The business had earlier advertised that a herbalist would be there on the weekend who uses "wild foraged plants".

The town of Clunes is about 36 kilometres north of Ballarat.

Anyone who witnessed the incident or has information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au

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A serving NSW police officer has been accused of secretly recording himself having sex with a woman while she was wearing a collar and lead before sharing the video with his colleagues.

Constable Alexander James Cox, 30, appeared at Sutherland Local Court on Tuesday, facing one count of recording intimate images without consent and two counts of distributing intimate images without consent.

He has pleaded not guilty to all of the charges.

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The court heard Cox was in a sexual relationship with the woman for about four months but that she had never given him permission to film them having sex and did not recall him making any such recordings.

The woman, who cannot be identified for legal reasons, said she was told Cox had shown a video of the couple having sex to colleagues in the police force, who she referred to as "the boys".

"He said he could see my tattoos. He said I was wearing a collar and a leash," the woman told the court.

Cox and the woman had sex on several occasions at his apartment at Engadine, in southern Sydney, during which they had sometimes used a collar and lead that she owned and brought with her, the court was told.

A photograph of the woman having sex with Cox that displayed her "distinctive tattoo" was also allegedly shown by him to another police colleague.

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But Cox's lawyer, Paul McGirr, described the police investigation into the allegations as "extremely poor" and no such photos or videos had been retrieved from his client's phone after it was seized.

He also noted the two witnesses who reported being shown the alleged sex video did not initially report seeing the woman's tattoos.

McGirr suggested that any pornographic video Cox showed his colleagues was not of the woman.

"People can't take tattoos on and off," he told the court.

"You cannot see her face and you cannot see Mr Cox.

"One would have to be satisfied … it's not the complainant."

The woman told the court she was not aware of Cox ever taking intimate images of her and the pair had ended their brief relationship on good terms.

"I thought trust was involved," the woman told the court.

The hearing continues.

1800 RESPECT (1800 737 732)

National Sexual Abuse and Redress Support Service 1800 211 028

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