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The caffeine or any of the other ingredients could be responsible

Mansour HH, El Kiki SM, Ibrahim AB, Omran MM

For example, the addition of varying concentrations of citrate to the diet of Drosophila on a high-calorie regimen resulted in a significant extension of lifespan, with higher concentrations of citrate also improving spontaneous activity and reproductive capacity in Drosophila

Yes, L-carnitine is one of the most used supplements during cutting phases by bodybuilding practitioners