If you’re considering popping a pill to relieve the extra holiday weight, you might want to think again. The FDA released a message this week warning consumers to stay away from 28 diet pills using “unlisted and dangerous ingredients,” as well as a “possible carcinogen.”

“These tainted weight loss products pose a great risk to public health because they contain undeclared ingredients and in some cases prescription drugs in amounts that greatly exceed their maximum recommended dosages,” said Dr. Janet Woodcock, director of the FDA drug evaluation center.

The primary ingredient in question is sibutramine, a very strong appetite suppressant that is related to amphetamine. This ingredient, which is linked to frightening health problems like heart attacks, stroke, heart palpitations and even increasing your risk for cancer, is not likely to be advertised on the labels of diet pills. The FDA warns that you as a consumer have no way of knowing sibutramine is in one of the following 28 diet pills:

3x Slimming Power
Fatloss Slimming
2 Day Diet
5x Imelda Perfect Slimming
3 Day Diet
Japan Lingzhi
24 Hour Diet
7 Diet Day/Night Formula
7 Day Herbal Slim
8 Factor Diet
999 Fitness Essence
Extrim Plus
GMP
Imelda Perfect Slim
Lida DaiDaihua
Miaozi Slim Capsules
Perfect Slim
Perfect Slim 5x
Phyto Shape
ProSlim Plus
Royal Slimming Formula
Slim 3 in 1
Slim Express 360
Slimtech
Somotrin
Superslim
TripleSlim
Zhen de Shou
Venom Hyperdrive 3.0

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