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Effectiveness of L-Carnitine for the Treatment of Erythropoietin-Resistant Renal Anemia: A Randomized, Double-Blind, Placebo-Controlled Pilot Trial.

  • 2026-05
  • Journal of renal nutrition : the official journal of the Council on Renal Nutrition of the National Kidney Foundation 36(3)
    • Stephanie E Reuter
    • Alison L Steiber
    • Randall J Faull
    • Allan M Evans

Study Design

Type
Randomized Controlled Trial (RCT)
Population
chronic hemodialysis patients who were hyporesponsive to ESA treatment
Methods
Randomized, double-blind, placebo-controlled pilot study; intravenous L-carnitine (10-20 mg/kg/dialysis session) or placebo for 3 months; erythropoietin resistance index (ERI) measured
Blinding
Double-blind
Duration
3 months
Funding
Unclear

Objective

Despite its use in the treatment of renal anemia, no adequately controlled studies have examined the impact of L-carnitine administration in the patient population for which it is indicated (i.e., those hyporesponsive to erythropoiesis-stimulating agents [ESAs]). This randomized, double-blind, placebo-controlled pilot study evaluated the potential benefit of L-carnitine supplementation for the treatment of renal anemia in chronic hemodialysis patients who were hyporesponsive to ESA treatment.

Methods

Patients shown to be hyporesponsive to ESA treatment were administered intravenous L-carnitine (10-20 mg/kg/dialysis session) or placebo for 3 months, during which erythropoietin resistance index (ERI) was measured as an indicator of treatment effectiveness. Secondary validation was conducted using an independent dataset.

Results

L-carnitine supplementation was associated with a 25% reduction in ERI, significantly greater than that seen in placebo-treated patients (3% reduction). This was supported by a 42% reduction after 6 months of treatment in the validation dataset. Overall, 88% of L-carnitine-treated patients had a clinically significant improvement in ERI, compared to 0% of placebo-treated patients.

Conclusions

These findings provide evidence to support the National Kidney Foundation's practice recommendations with respect to the clinical use of L-carnitine for renal anemia. While the exact mechanism is yet to be elucidated, it is proposed that L-carnitine treatment improves carnitine palmitoyltransferase activity via carnitine pool normalization, thereby resulting in stabilization of the erythrocyte membrane. If this is the case, then it is feasible that a dual approach to increase erythrocyte production and lifespan through co-administration of ESA and L-carnitine provides a viable treatment option for ESA-resistant patients.

Research Insights

  • L-Carnitine→Reduced Erythropoietin Resistance Index

    L-carnitine supplementation was associated with a 25% reduction in ERI, significantly greater than that seen in placebo-treated patients (3% reduction). This was supported by a 42% reduction after 6 months of treatment in the validation dataset. Overall, 88% of L-carnitine-treated patients had a clinically significant improvement in ERI, compared to 0% of placebo-treated patients.

    Effect
    Beneficial
    Effect size
    Large
    Dose
    10-20 mg/kg/dialysis session
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