The Lemon Detox Diet promises to cut up to 9kg in 10 days – claims which are now being investigated by the Food Safety Authority.
More than 40,000 Kiwis have now done the diet.
But Campbell Live set out to answer the question; Is it really safe?
The company marketing the Lemon Detox Diet stands by the safety of its product, insisting it is safe for people to use several times a year.
But is it's main aim to shed weight, or to detox?
Campbell Live talks to spokesman Endree Saade