Slimmers have been warned by the FDA to avoid nearly 30 weight-loss products sold on the internet due to potentially harmful ingredients.

Many of these products are marketed as ‘natural’ fat burners. The manufactures claim that they are new and improved versions of ancient health remedies from Asia. Sold globally to dieters via the internet, these weight loss products promise a quick fix.

The potentially dangerous dieting products include Zhen de Shou, Imelda Perfect Slimming, 2 Day Diet, 24 Hours Diet, ProSlim Plus, 999 Fitness Essence, Miaozi Slim Capsules, Slim Express 360, Royal Slimming Formula and Somotrin.

The FDA stated that these products contain unlisted ingredients, including high doses of a powerful prescription anti-obesity drug, as well as a chemical linked to cancer.

Laboratory analysis revealed that 28 of the diet pills tested could put users in hospital. Nearly all were found to contain Sibutramine, a strong appetite suppressant similar to amphetamines. Sibutramine is also the chemical ingredient in the prescription drug Meridia, which is used to treat obesity Side effects can include heart attacks, strokes and heart palpitations, especially in people with a history of high blood pressure or heart problems.

Some of these weight loss pills were found to contain nearly three times the recommended daily dose of Sibutramine. Several contain Phenolphthalein, a chemical used as a laxative, but which is now being withdrawn from the market because of suspected cancer risks.

None of the slimming supplements, believed to have originated in China, lists the dangerous chemicals on their packaging or containers. The FDA is considering criminal charges against some of the companies, because they have not responded to requests for product recalls.