A hard run creates more than sweat, laundry, and the sudden conviction that the stairs have become steeper. Working muscle also produces reactive oxygen and nitrogen species. These molecules are often filed under “bad things antioxidants should remove,” but biology is less tidy. In moderate amounts, they also help carry the message that tells your body to adapt to training.
That makes antioxidants for runners a dose-and-context question, not a good-or-bad contest. Colorful food belongs on the plate, and supplements can also help runners maintain adequate intake when training load, travel, dietary restrictions, or ordinary life make nutrition less predictable. Even higher-dose antioxidant supplementation can be useful in certain situations. The important questions are what you are taking, how much, when, and for what purpose.
Oxidative stress is not one simple villain
During exercise, oxygen use rises and contracting muscle produces reactive species. At excessive levels, these molecules can damage lipids, proteins, and other cell components. At lower, controlled levels, however, they participate in cell signaling. Think smoke alarm, not house fire. A useful signal gets your attention; an uncontrolled blaze is another matter entirely.
Training also strengthens the body's own antioxidant defenses. A 2026 International Society of Sports Nutrition position stand describes redox balance as a spectrum: mild oxidative “eustress” can support adaptation, while excessive oxidative distress may impair health, recovery, and performance. That distinction matters. The goal is not to eliminate every reactive molecule, but neither is it to leave excessive oxidative stress unaddressed. Food and supplements can both be useful tools, depending on the runner and the situation.
This is important because measuring a lower oxidative-stress marker after taking a supplement does not prove that you will recover faster, run farther, or race better. A biomarker is evidence about a biological process. A performance outcome is what happens to pace, time to exhaustion, power, or another meaningful result. The two can be connected, but they are not interchangeable.
What the vitamin C and E studies actually found
The caution around antioxidant supplements comes largely from trials using doses far above normal food intake. In a 2009 study, 39 healthy young men, some trained and some previously untrained, received 1,000 mg of vitamin C plus 400 IU of vitamin E daily during four weeks of exercise. The supplement combination blunted several exercise-related changes in insulin sensitivity and endogenous antioxidant-defense gene expression. This was a short study in young men, not a trial of masters runners or race performance.
A 2014 randomized trial followed 54 healthy young adults through 11 weeks of endurance training. Participants took 1,000 mg vitamin C plus 235 mg vitamin E per day or placebo. Some cellular markers of mitochondrial adaptation were lower with supplementation, yet improvements in maximal oxygen uptake and running performance were not meaningfully different between groups. That distinction matters: the cells told a more complicated story than the stopwatch.
The literature is not perfectly uniform. A 2010 trial found that vitamin C and E supplementation did not change measured endurance-training adaptations. A small 2015 trial in 11 healthy young men found that 1,000 mg vitamin C plus 400 IU vitamin E daily attenuated some skeletal-muscle adaptations, but did not prevent the increase in VO2peak. Taken together, the sensible conclusion is more nuanced than “antioxidant supplements are bad.” High-dose C and E can alter some exercise-response pathways, but a consistent harm to endurance performance has not been demonstrated. Other studies have found reductions in exercise-induced oxidative stress and muscle-damage markers. That means higher doses may help in some settings, particularly when the goal is limiting excessive oxidative stress or supporting short-term recovery. The benefit depends on the runner, the training phase, the dose, and the outcome being measured.
Food is not a megadose in a different costume
A medium orange provides about 70 mg of vitamin C. One ounce of almonds supplies about 6.8 mg of vitamin E. Those foods also bring carbohydrate, fiber, fats, polyphenols, and many other compounds in a food matrix. They are not equivalent to a capsule protocol delivering 1,000 mg of vitamin C and hundreds of milligrams or international units of vitamin E.
| Choice | What it provides | Practical runner takeaway |
|---|---|---|
| Orange, berries, peppers, broccoli | Vitamin C plus carbohydrate, fiber, and plant compounds | Eat them normally across the day. There is no reason to avoid antioxidant-rich food near training. |
| Almonds, sunflower seeds, vegetable oils | Vitamin E, mostly with dietary fat and other nutrients | Use regular servings as part of meals and snacks, not as a race-week experiment. |
| High-dose isolated C + E | Trials commonly used 1,000 mg vitamin C with 235 mg vitamin E or 400 IU vitamin E daily | May reduce oxidative-stress or muscle-damage markers in some settings. Use it deliberately, because adaptation and performance results are mixed. |
For reference, the adult Recommended Dietary Allowance for vitamin C is 90 mg for men and 75 mg for women; people who smoke need 35 mg more. The adult RDA for vitamin E is 15 mg of alpha-tocopherol. These are adequacy targets, not performance prescriptions. The adult upper limits are 2,000 mg per day for vitamin C from food and supplements combined, and 1,000 mg per day for supplemental alpha-tocopherol. An upper limit is a safety boundary, not a goal or proof of usefulness.
A practical approach for busy runners
Build the foundation first
Start with repeatable food habits. Add berries to breakfast, put peppers or leafy greens into lunch, keep oranges or kiwifruit around, and use nuts or seeds in ordinary portions. Supplements can then provide a consistent nutritional backstop when the week is less tidy than the plan. Food and supplementation do not have to compete; they can serve different parts of the same goal.
Read the total daily dose
Vitamin C and E can appear in a multivitamin, an immune product, a drink mix, and a stand-alone antioxidant. Check the Supplement Facts panels and add the amounts. Study findings from a combined high-dose C and E protocol cannot be transferred automatically to a lower-dose multivitamin, a different formulation, or either nutrient by itself.
Match the dose to the reason
A daily multivitamin, a targeted higher-dose protocol, and treatment for a diagnosed deficiency are three different uses of supplements. Higher doses may be appropriate when the goal and evidence support them, but they deserve more attention to total intake, timing, health history, and medications. Vitamin E supplements can affect bleeding risk, and vitamin C can interact with certain treatments and may be a concern in some kidney or iron-overload conditions. If a supplement is serving a medical purpose, discuss changes with the professional managing that care.
FAQ
Should runners avoid fruit after a workout?
No. The studies raising adaptation questions used concentrated supplement doses, not normal servings of fruit and vegetables. Post-run food should still cover the basics: fluid, carbohydrate, protein, and an overall varied diet.
Do antioxidants reduce soreness?
Some specific foods or compounds have been studied for soreness and recovery, but results depend on the ingredient, dose, timing, exercise, and population. A lower soreness score does not automatically mean better long-term adaptation, and “antioxidant” is too broad a label to predict an outcome.
Is a standard multivitamin the same as the high-dose trials?
No. Compare the exact nutrients and daily amounts. The key endurance trials discussed here used 1,000 mg vitamin C plus either 235 mg or 400 IU vitamin E each day. PEREGRUNE Runner Multivitamin provides 333 mg of vitamin C and 44 mg of vitamin E as part of a broader daily formula. That is not the same intervention, and different doses, forms, combinations, and purposes should not be treated as clinically equivalent.
The bottom line
Antioxidants are not the enemy, and neither are antioxidant supplements. Adequate intake supports normal immune function and helps protect cells from oxidative stress. Higher doses can also be useful in the right context, and some research shows reductions in exercise-induced oxidative stress and muscle-damage markers. The mistake is assuming that one dose, one timing strategy, or one outcome applies to every runner.
PEREGRUNE Runner Multivitamin was designed as consistent daily nutritional support, not as megadose therapy. Its antioxidant nutrients sit inside a broader formula for runners who want to support the work they are already doing. The practical goal is balance: enough support to meet the demands of training without pretending that every reactive molecule needs to disappear.
Dietary-supplement disclaimer: This article is for general educational purposes and is not medical advice. Supplements can interact with medications and may not be appropriate for everyone. Discuss individual needs, medical conditions, and high-dose supplement use with a qualified healthcare professional.
Sources
- International Society of Sports Nutrition position stand: effects of dietary antioxidants on exercise and sports performance (2026)
- Ristow et al. Antioxidants prevent health-promoting effects of physical exercise in humans (2009)
- Paulsen et al. Vitamin C and E supplementation hampers cellular adaptation to endurance training in humans (2014)
- Yfanti et al. Antioxidant supplementation does not alter endurance training adaptation (2010)
- Morrison et al. Vitamin C and E supplementation prevents some cellular adaptations to endurance training (2015)
- Taghiyar et al. Vitamin C and E supplementation, muscle damage, and oxidative stress in female athletes (2013)
- NIH Office of Dietary Supplements: Vitamin C fact sheet for health professionals
- NIH Office of Dietary Supplements: Vitamin E fact sheet for health professionals
