Claims on dietary and herbal supplements attribute weight loss to several mechanisms including the following:
* Increase of energy expenditure: ephedra, caffeine, guarana, bitter orange, yerba maté
* Increase in satiety: soluble fibers such as guar gum, glucomannan, psyllium
* Increase of fat oxidation: hydroxycitric acid (HCA), green tea, conjugated linoleic acid (CLA), fish oil, capsaicin, carnitine
* Blocking of dietary fat absorption: chitosan
* Modulation of carbohydrate metabolism: chromium
* Increase of fat excretion: calcium
* Increased water elimination: dandelion, cascara
* Enhancement of mood: St. John's wort
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