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Some people try dietary supplements to help with weight loss. While some dietary supplements are usually safe when taken as directed, some are not and may harm your health. Find out more about the safety and effectiveness of diet and weight loss pills and other types of supplements.

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Thumbnail: Leptin Hormone & Supplements: Do They Work for Obesity & Weight Loss?

WebMD explains what the leptin hormone is, how it affects weight, and whether leptin supplements are safe or effective.

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