A natural health supplement classified as dangerous by the US Food and Drug Administration is still being sold online, although a major pharmacy group has pulled it from the shelves.

Earlier this week, the FDA issued a warning that Miracle Mineral Solution is unsafe and people who use it should stop doing so immediately.

Dis-Chem has been selling Miracle Mineral Solution but said it will take action immediately.

"If that product is on our shelves, which I did not know about, it will be off this morning," said the company's Stan Gates.

On its official website, the manufacturer claims MMS can treat a variety of diseases including Aids, TB, Hepatitis, cancer and malaria.

But this week, the FDA issued a warning, saying when used as directed MMS can cause serious side-effects like diarrhea, vomiting and severe low blood pressure.

Distributors Bio Sil and MMS Africa would not comment.