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L-carnitine is an amino acid that may help support weight loss, brain function, and disease prevention

We explain how each works, what the research supports, how they compare, and what anyone considering peptide therapy needs to understand before moving forward

Some people opt for supplementation to increase levels for specific health or fitness goals, including weight loss, improved endurance, or enhanced recovery

The authors of the 2025 study from the University of Turin suggest that the combination of L-carnitine and selenium may have a synergistic effect, and that L-carnitine may also have an immunomodulatory role, and its actions are not limited to peripheral thyroid hormone antagonism