L-Carnitine & Weight Management
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L-carnitine participates in fatty-acid transport and energy metabolism. That biological role is real, but it should not be converted into a guaranteed fat-loss claim.
What trials suggest
NIH summaries describe a possible modest reduction in body weight across some studies, while individual trials have produced mixed results. Larger and better-targeted research is still useful.
Safety context
Supplemental carnitine can cause gastrointestinal effects and a fishy body odor at higher intakes. Product-specific dose information matters when comparing formulas.