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Guarana is sometimes used in cellulite products because of its theophylline and caffeine components. Research has shown it can be absorbed into the skin. (Sources: International Journal of Pharmaceutics, April 2006, www.sciencedirect.com/; Food and Chemical Toxicology, June 2006, pages 862–867; Clinical Nutrition, December 20005, pages 1019–1028; and Clinical Pharmacology & Therapeutics, June 2005, pages 560–571).

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