In adult male Sprague-Dawley rats that run voluntarily, taking 500 mg/kg of vitamin C daily for three weeks reduces the increase in mitochondrial protein synthesis that normally occurs in soleus and plantaris muscles after exercise.
See the scientific wording
Daily supplementation with 500 mg/kg of vitamin C for three weeks significantly reduces exercise-induced increases in mitochondrial protein synthesis in the soleus and plantaris skeletal muscles of adult male Sprague-Dawley rats undergoing voluntary endurance exercise.
Correlational — new studies may shift this
Randomized trialsOne low-scoring study links this claim to the outcome, but causation is not established.
What the research says
1 study reviewedSupporting (1)
Differential effects of vitamin C or protandim on skeletal muscle adaptation to exercise.
Cohort StudyAnimal2018
When rats ran a lot and took a high dose of vitamin C, their muscles made fewer new energy-producing parts (mitochondria) than rats that ran without the vitamin. This suggests vitamin C might stop the body from getting the full benefits of exercise.
Contradicting (0)
No contradicting studies found yet
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When muscles work hard, they produce hydrogen peroxide and other molecules that act as signals to build more energy-producing parts inside cells. Vitamin C removes these signals before they can trigger the building process, so the muscles make fewer new energy-producing parts even after exercise.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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In adult male Sprague-Dawley rats that run voluntarily, taking 500 mg/kg of vitamin C daily for three weeks reduces the increase in mitochondrial protein synthesis that normally occurs in soleus and plantaris muscles after exercise.
Mechanism
1 studyMuscles need small bursts of reactive molecules during exercise to tell the cell to build more energy factories. Vitamin C removes these molecules before they can send the signal, so the muscles don't build as many new energy factories even after working hard.
When muscles work hard, they produce hydrogen peroxide and other molecules that act as signals to build more energy-producing parts inside cells. Vitamin C removes these signals before they can trigger the building process, so the muscles make fewer new energy-producing parts even after exercise.
Exercise-induced muscle contractions generate hydrogen peroxide and other reactive oxygen species in skeletal muscle fibers
Exogenous vitamin C directly reacts with and neutralizes hydrogen peroxide and other reactive oxygen species, reducing their concentration in muscle cells
Reduced levels of reactive oxygen species prevent activation of redox-sensitive signaling proteins including AMPK, PGC-1α, and NRF2
Suppressed signaling leads to decreased transcription of nuclear and mitochondrial genes encoding mitochondrial proteins
Synthesis of new mitochondrial proteins is reduced, impairing mitochondrial biogenesis and proteostatic maintenance in both soleus and plantaris muscles
Evidence from Studies
Supporting (1)
Community contributions welcome
Differential effects of vitamin C or protandim on skeletal muscle adaptation to exercise.
When rats ran a lot and took a high dose of vitamin C, their muscles made fewer new energy-producing parts (mitochondria) than rats that ran without the vitamin. This suggests vitamin C might stop the body from getting the full benefits of exercise.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review of Antioxidant Supplementation Effects on Mitochondrial Protein Synthesis in Rodent Endurance Models
Population: Adult male Sprague-Dawley rats; Intervention: Daily 500 mg/kg vitamin C; Comparator: Placebo; Outcome: Mitochondrial protein synthesis in soleus and plantaris muscles; Duration: Three weeks of voluntary endurance exercise
Double-Blind Randomized Trial of 500 mg/kg Vitamin C vs Placebo on Mitochondrial Protein Synthesis in Exercising Male Sprague-Dawley Rats
Population: Adult male Sprague-Dawley rats; Intervention: Daily 500 mg/kg vitamin C; Comparator: Isocaloric placebo; Outcome: Mitochondrial protein synthesis in soleus and plantaris muscles measured via stable isotope labeling; Duration: Three weeks of voluntary wheel running; Design: Randomized, blinded, controlled
Prospective Cohort Study of Vitamin C Dosage and Mitochondrial Protein Synthesis in Rats Undergoing Progressive Endurance Training
Population: Adult male Sprague-Dawley rats; Intervention: Different daily doses of vitamin C (including 500 mg/kg); Comparator: No supplement; Outcome: Mitochondrial protein synthesis in soleus and plantaris muscles measured weekly; Duration: Four weeks of voluntary endurance exercise; Design: Prospective, non-randomized, longitudinal
In Vitro Effect of Vitamin C on Mitochondrial Protein Synthesis in Rat Skeletal Muscle Myotubes Under Simulated Exercise Stress
Population: Primary myotubes derived from soleus and plantaris muscles of Sprague-Dawley rats; Intervention: Exposure to 500 mg/kg equivalent concentration of vitamin C; Comparator: Vehicle control; Outcome: Mitochondrial protein synthesis rate measured via puromycin labeling; Duration: 24–72 hours; Design: Controlled cell culture with simulated exercise stress via hydrogen peroxide or electrical stimulation
Single-Arm Pilot Study of Vitamin C Supplementation on Muscle Adaptations in Exercising Male Sprague-Dawley Rats
Population: Adult male Sprague-Dawley rats; Intervention: Daily 500 mg/kg vitamin C; Comparator: None; Outcome: Mitochondrial protein synthesis in soleus and plantaris muscles; Duration: Three weeks of voluntary endurance exercise; Design: Single-group, non-randomized, non-blinded