Supplement analysis backed by scientific evidence · PT

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Limited evidencePhysical performance

L-Carnitine L-Tartrate

A rapidly absorbed carnitine salt used for recovery rather than fat loss. The recovery data come from a small cluster of trials, largely from one research group.

Evidence last reviewed: August 2026

What the science says

  • Lower markers of muscle damage Limited evidence

    A controlled trial in middle-aged men and women found 2 g/day of L-carnitine L-tartrate improved biochemical markers of recovery from physical exertion. Sample sizes in this literature are small.

  • Hormonal and receptor changes after resistance exercise Limited evidence

    A randomised trial found L-carnitine L-tartrate altered hormonal responses and androgen receptor content following resistance exercise. Whether this produces more muscle or strength was not tested.

  • Not a fat-loss agent at these doses Limited evidence

    These recovery trials did not measure body composition benefits, and carnitine's fat-oxidation claims rest on much longer protocols with carbohydrate co-ingestion.

Dosage & safety

Studied dose1–2 g/day of L-carnitine L-tartrate, taken daily rather than only on training days.
SafetyWell tolerated; fishy body odour and GI upset occur at higher doses. Gut bacteria convert oral carnitine to TMAO, which has been linked to cardiovascular risk in observational research. Caution with warfarin, thyroid medication and in seizure disorders.

Scientific references

Where to buy

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