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It acts on several levers: Thermogenesis: natural heat production by the body to burn more calories Lipolysis: breakdown of fats stored in adipocytes Appetite regulation: some active ingredients have a natural appetite suppressant effect that helps limit cravings Energy and vitality: caffeine or guarana-based formulas increase alertness and energy expenditure Most effective fat burners contain plant extracts such as green tea, citrus aurantium, guarana, spirulina or L-carnitine, known for their role in energy metabolism

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On a pharmacological level, the bulk of circulating IGF-1 is produced by constant hepatic synthesis, amounting to about 1015 mg daily, which attains a stable plasma concentration around 1030 nM

Worth noting, caffeine is definitely not the only stimulant in either of these drinks--or others on the market--so it's probable that the FDA investigation may lead to further ingredient probing