What does the evidence say about L-Carnitine Supplementation Exercise Recovery Meta-Analysis?

Updated October 2026

Quick Answer

L-Carnitine Supplementation Exercise Recovery Meta-Analysis has evidence relevant to benefits, uncertainty, and practical interpretation, but conclusions should stay close to the cited sources. One representative finding is: No trial differences were found for I-FABP (interaction effect, p = 0.076), L: 13 CM ( p = 0.559), the neutrophil/lymphocyte ratio ( p = 0.171), serum cortisol ( p = 0.982), serum myoglobin ( p = 0.942), or serum creatine kinase ( p = 0.694).

Key Takeaways

  • 01No trial differences were found for I-FABP (interaction effect, p = 0.076), L: 13 CM ( p = 0.559), the neutrophil/lymphocyte ratio ( p = 0.171), serum cortisol ( p = 0.982), serum myoglobin ( p = 0.942), or serum creatine kinase ( p = 0.694). [Nieman DC (2025)]
  • 02Conclusions Betaine supplementation modestly improved 60 km cycling performance but had no effect on gut permeability. [Nieman DC (2025)]
  • 03Background/objectives This study examined the effects of 2 weeks of betaine versus placebo supplementation (3 g/d) on 60 km cycling performance, gut permeability, and shifts in plasma metabolites. [Nieman DC (2025)]
  • 04A randomized, placebo-controlled, double-blind, crossover design was used with two 2-week supplementation periods and a 2-week washout period. [Nieman DC (2025)]
The current Migaku evidence database contains 2 reusable source documents for L-Carnitine Supplementation Exercise Recovery Meta-Analysis. This answer focuses on benefits, uncertainty, and practical interpretation. - No trial differences were found for I-FABP (interaction effect, p = 0.076), L: 13 CM ( p = 0.559), the neutrophil/lymphocyte ratio ( p = 0.171), serum cortisol ( p = 0.982), serum myoglobin ( p = 0.942), or serum creatine kinase ( p = 0.694). [Nieman DC (2025); evidence level 4] - Conclusions Betaine supplementation modestly improved 60 km cycling performance but had no effect on gut permeability. [Nieman DC (2025); evidence level 4] - Background/objectives This study examined the effects of 2 weeks of betaine versus placebo supplementation (3 g/d) on 60 km cycling performance, gut permeability, and shifts in plasma metabolites. [Nieman DC (2025); evidence level 4] - A randomized, placebo-controlled, double-blind, crossover design was used with two 2-week supplementation periods and a 2-week washout period. [Nieman DC (2025); evidence level 4] - This process is associated with the increase in the production of free radicals from mitochondrial activity and the postexercise increase in muscle inflammation []. [Caballero-García Alberto (2023); evidence level 4] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.

Sources

  1. Betaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery.
  2. Effects of L-Carnitine Intake on Exercise-Induced Muscle Damage and Oxidative Stress: A Narrative Scoping Review