Written by Martin Ebner
Last updated October 2026.
You know the feeling. Leg day felt fantastic, then two mornings later lowering yourself onto the toilet becomes a controlled descent and every staircase feels personal. That’s delayed-onset muscle soreness, better known as DOMS.
Vitamin C often gets pulled into the recovery conversation because it helps your body make collagen and acts as an antioxidant. That makes the idea sound plausible. The problem is that plausible and proven aren’t the same thing, and the best evidence doesn’t show that taking more vitamin C will reliably rescue your legs.
WHAT SORE MUSCLES ACTUALLY MEAN
DOMS usually appears after unfamiliar or unusually demanding exercise, especially when your muscles are working hard while lengthening. Think lowering a weight, running downhill or returning to squats after some time away.
The soreness tends to creep in later and can be at its worst over the following day or two. It isn’t caused by lactic acid hanging around in your muscles, and it isn’t a scorecard for the quality of your workout. You can train brilliantly without struggling to sit down the next morning.
A little soreness after doing something new is perfectly normal. If every workout leaves you unable to move properly for several days, however, that’s not evidence of superior effort. It usually means the session asked for more than you were ready to recover from.
DOES VITAMIN C HELP WITH MUSCLE SORENESS?
Possibly a little in some circumstances, but not reliably enough to call it a solution.
A systematic review of 14 controlled studies found that only three reported a significant reduction in soreness at every measured time point. The authors concluded that the evidence wasn’t strong enough to confirm that vitamin C or vitamin E reduces DOMS.
A separate meta-analysis of 18 randomised trials reached a similar conclusion. Vitamin C reduced some markers of oxidative stress and inflammation after exercise, but it didn’t significantly improve muscle soreness, strength or creatine kinase, which is commonly used as a marker of muscle damage.
That distinction matters. A supplement can change something in a blood test without making you feel better, recover faster or perform differently.
WHY VITAMIN C STILL MATTERS
None of that makes vitamin C useless. Your body needs it for collagen production, wound healing, iron absorption, immune function and antioxidant protection. A genuine deficiency is a problem, and consistently eating too little will do far more harm than missing one supposedly perfect post-workout dose.
The sensible place to begin is food. Citrus fruits, kiwifruit, strawberries, peppers, broccoli and potatoes can all contribute meaningful amounts. If you regularly eat a decent variety of fruit and vegetables, reaching your basic requirement isn’t especially difficult.
The National Institutes of Health vitamin C guidance puts the recommended daily amount at 90 mg for adult men and 75 mg for adult women. Those amounts support normal health. They aren’t special athletic recovery targets, because no universally accepted high-dose target for athletes exists.
HOW MUCH VITAMIN C DO YOU NEED?
For most people, meeting the normal daily requirement is enough. If your diet is limited, you rarely eat fruit or vegetables, or you simply want some nutritional insurance, a modest supplement can fill the gap.
There’s no good reason to jump automatically to enormous doses. The adult upper limit is 2,000 mg per day, and taking too much can cause diarrhoea, nausea and stomach cramps. The previous version of this article suggested that athletes might need anywhere from 500 to 3,000 mg per day for soreness. I don’t stand by that advice. The evidence doesn’t support it, and the top end exceeds the established daily upper limit.
More isn’t automatically better just because vitamin C is water-soluble.
MORE ANTIOXIDANTS DON’T GUARANTEE MORE RECOVERY
Exercise creates oxidative stress, but that isn’t entirely bad. Some of those signals help your body recognise the work it has done and adapt to it.
Research on high-dose vitamin C and vitamin E around training is mixed. A systematic review and meta-analysis of training studies found no clear overall reduction in strength, muscle or aerobic adaptations, although individual trials have found changes in the cellular signals involved in adaptation.
I wouldn’t panic about taking vitamin C, but I also wouldn’t hammer huge antioxidant doses around every workout in the hope of cancelling the normal recovery process. There’s no convincing upside.
WHERE PERFORMANCE LAB VITAMIN C FITS
If you want a straightforward supplement rather than another megadose, Performance Lab Vitamin C is a sensible option. Two capsules provide 250 mg of vitamin C in a vegan formula without caffeine, gluten or the usual collection of unnecessary extras.
What I like most is the dose. It comfortably covers the daily requirement without trying to convince you that several thousand milligrams must be better. It still won’t magically remove DOMS, and I haven’t found a controlled trial showing that the finished Performance Lab product improves workout recovery. It’s nutritional insurance, not a recovery miracle.
It also costs more than ordinary ascorbic acid, so you’re paying for the cleaner formulation and presentation. If you already eat plenty of vitamin C-rich food, you may decide you don’t need it at all.
Use code EXTRA10 for 10% off your order.
If you’re looking for a broader immune-support formula rather than standalone vitamin C, I’ve reviewed Performance Lab Immune separately.
WHAT ACTUALLY HELPS WHEN YOU’RE SORE
The boring things remain the useful things. Eat enough protein and carbohydrate, drink normally, sleep properly and give the muscles time to settle. My wider guide to recovering properly after exercise covers the parts that make the biggest practical difference.
Easy movement can feel good, and massage may provide a small reduction in soreness, although it won’t instantly repair the muscle. A systematic review of sports massage found a modest improvement in DOMS, but no meaningful improvement in strength, sprinting, endurance or fatigue.
You don’t necessarily need to stop training because one area is sore. Train something else, reduce the load or take a proper rest day if that’s what your body needs. Sensible training should build your capacity, not leave you repeatedly crawling around the house.
Sharp or localised pain, major swelling, unusual weakness, dark urine or symptoms that keep getting worse aren’t standard DOMS. That’s the point to stop guessing and get it checked.
THE HONEST VERDICT
Vitamin C matters, but taking more of it won’t reliably prevent sore muscles or speed up workout recovery. Get enough through food, use a sensibly dosed supplement if there’s a genuine gap, and don’t mistake a high number on the label for a better result.
If you’ve ever stood at the bottom of a staircase after leg day and wondered whether a capsule could save you, Check It Oot is where I separate useful fitness advice from wishful thinking. One email once or twice a month, written by me and sent straight to your inbox.
