Raspberry ketone is one of several naturally occurring chemicals found in red raspberries that contribute to their aroma; it also occurs in other fruits such as cranberries and blackberries. Raspberry ketone is used in some foods as a flavoring agent, as well as in other products. Because the amount of raspberry ketone found naturally is so low, it is produced synthetically in a laboratory to be used in commercial products such as cosmetics and dietary supplements.

Dietary supplements containing raspberry ketone are often marketed for weight loss. The limited number of studies done on cells, mice, rats, and other small animals indicate that raspberry ketone might improve fat metabolism in these subjects. However, the same effect has yet to be established in humans, and currently there is insufficient scientific evidence to conclude that raspberry ketones can control or reduce body fat or weight in humans.

Updated 21 August 2017

References

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Wang, L., Meng, X., & Zhang, F. (2012). Raspberry ketone protects rats fed high-fat diets against nonalcoholic steatohepatitis. Journal of Medicinal Food, 15(5), 495–503. doi:10.1089/jmf.2011.1717