What supplements help with DOMS?

Soreness is a curve with three dials, not a level: what DOMS is and is not, where the peak sits, and how a supplement trial is read against the dials

What supplements help with DOMS is answered badly whenever soreness is treated as a single number that a product either lowers or does not, because delayed onset muscle soreness is not a level, it is a curve. It is absent immediately after the session, rises through the first day, peaks somewhere between the first and third day, and resolves within about a week, and a lifter who wants to know what helps needs to know which part of that curve they want moved. The curve has three dials. The first is the peak, how sore the muscle is at its worst, usually on the second morning, rated on a scale or measured as pressure pain threshold. The second is the duration, how long the soreness takes to return to nothing. The third is the floor, the baseline the muscle returns to, which matters because a muscle that is still slightly sore at the next session is a muscle that performs slightly worse in it. Every supplement trial against soreness has measured one or more of these dials, and reading the trials by dial rather than by headline is what separates a useful answer from a list of products.

Before the dials, what the soreness is. The mechanism reviews are clear that it is not lactic acid, which is cleared from the muscle within an hour of finishing and plays no part in anything felt a day later, however persistently the idea survives in gyms. Soreness follows unaccustomed work, and especially eccentric work, the lowering phase of a lift or the downhill of a run, in which the muscle lengthens under load. That work disrupts the structure of the fibre and the connective tissue around it, the disruption triggers an inflammatory and repair response over the following day, and the swelling and sensitisation of that response is what is felt as soreness. The markers measured in blood after such a session, the enzymes that leak from damaged fibres, correlate only weakly with how sore a person feels, which is why trials that report a change in a blood marker without a change in rated soreness have not shown that a supplement helps with DOMS, and why the dials on this page are the felt and functional ones rather than the laboratory ones.

A supplement trial against soreness is read against the dials with three questions. Which dial did it move, by how much, and in whom. The last question matters most and is asked least. Nearly all of the soreness trials recruit people who are untrained or who are given a bout of exercise they are not accustomed to, hundreds of eccentric contractions on a machine or a downhill run, because that is the only reliable way to produce enough soreness to measure a reduction in. A trained lifter following their own programme produces far less soreness in the first place, because of a protective effect this page returns to, and a supplement that lowers a large peak by a small margin in an untrained volunteer lowers a small peak by a smaller margin in a lifter who has been squatting for years. That reading, which dial, how much, in whom, is applied to each candidate in the next section.

Three dials, a mechanism that is not lactic acid, and a population problem in the trials, and the candidates themselves, read against the dials, which is the next section.

The candidates read by dial: what tart cherry, omega-3, curcumin, protein, caffeine and antioxidants moved and did not, the one intervention that moves all three, where magnesium's claims stop, and the verdict

Tart cherry concentrate has the largest number of trials, mostly in runners and in people given eccentric protocols, and the pattern across them is a small reduction in the peak and a slightly faster return of strength over the following days, with the effect clearer in the trials funded by producers and smaller in the independent ones. Omega-3 fatty acids at a few grams a day for some weeks before the eccentric bout lowered rated soreness at its peak by a small margin in several trials and did nothing in others, with no consistent effect on duration. Curcumin at a gram or two a day with an absorption enhancer lowered peak soreness in a handful of trials of unaccustomed exercise, and the effect in trained people is untested. Protein at the intakes the lifting guidance recommends, around 1.6g per kilogram a day spread across meals, reduced soreness and marker release modestly in some trials and is the one candidate that also drives the adaptation the soreness is a by-product of, which makes it the one worth taking for its own sake rather than for the dial. Caffeine taken on the sore day itself lowered rated soreness during exercise in two small trials, which is a pain-perception effect, not a repair one, and a tablet before a session on a sore day is the one acute use with support. Each of these moved the peak dial by a small margin, the duration dial by less, and the floor dial not at all, in people made deliberately sore.

The antioxidant candidates deserve a separate warning. High-dose vitamin C and E, taken on the theory that the inflammatory response is the enemy, did not consistently reduce soreness in trials and in several reduced the training adaptation itself, blunting the strength and endurance gains the sessions were producing, because the inflammatory signal the vitamins suppressed was part of how the muscle adapts. A lifter who buys an antioxidant stack against soreness is paying to feel slightly less sore and to adapt slightly less, which is the wrong trade for anyone training to get stronger, and the same logic argues against taking anti-inflammatory medicines routinely for soreness rather than for an injury, a question for a pharmacist if the habit has formed.

The one intervention that moves all three dials by a large margin is not sold at all. The repeated-bout effect is the finding that a single bout of unaccustomed eccentric work protects the muscle against the next: do the session once, be sore, do it again a week or two later and the soreness, the strength loss and the marker release are all much smaller, and the protection lasts for weeks. It is why trained lifters are rarely very sore from their own programme and why a new exercise, a new rep range or a return from a layoff produces the soreness they remember from their first month. The practical reading is that soreness is managed by the programme rather than by the cupboard: introduce new movements gradually, keep the movements that are in the programme in it, and accept that the first session back after a break will be sore whatever is swallowed. No supplement trialled has come close to the size of this protection, and a lifter who spends on tart cherry while rotating exercises every session has spent on the small dial and ignored the large one.

The worked example is placed on its own dial and no other: {FL} is authorised for normal muscle function, normal protein synthesis, electrolyte balance and the reduction of tiredness and fatigue, claims about the mineral's role in a working muscle, and it has no claim for soreness, recovery or inflammation and this page makes none. It is 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, batch tested for lead, mercury, arsenic and cadmium, UK made, 180 capsules for £19.99 at 22p a day, and a lifter whose plate is short of the mineral takes it for the plate, not for the second morning. The full label breakdown is here.

The verdict: read soreness as three dials. Protein at the recommended intake moves the peak a little and drives the adaptation anyway, so it is taken regardless. Tart cherry, omega-3 and curcumin move the peak by a small margin in people made deliberately sore and by less in a lifter, and are bets at pence rather than purchases. Caffeine lowers felt soreness during a session on a sore day. Antioxidant stacks are left alone because they cost adaptation. And the repeated-bout effect, keeping movements in the programme and introducing new ones gradually, moves every dial further than anything in a tub, for nothing.

What to check on the label

Questions people also ask

What is the best supplement for DOMS?

Measured on the soreness curve's three dials, no supplement scores well: protein at around 1.6g per kilogram a day lowers the peak a little and is taken anyway because it drives the adaptation, tart cherry, omega-3 and curcumin each lowered peak soreness by a small margin in trials of people made deliberately sore with unaccustomed eccentric work, with smaller effects expected in a trained lifter, and caffeine lowers felt soreness during a session on a sore day; the intervention that moves every dial by a large margin is the repeated-bout effect, which is not sold.

Is DOMS caused by lactic acid?

No; lactic acid is cleared from the muscle within an hour of finishing and plays no part in soreness felt a day or two later, however persistently the idea survives; the mechanism reviews place delayed onset soreness in mechanical disruption of the fibre and surrounding connective tissue after unaccustomed or eccentric work, followed by an inflammatory and repair response whose swelling and sensitisation is what is felt, and the blood markers of fibre damage correlate only weakly with how sore a person actually feels.

Why am I less sore now than when I started lifting?

Because of the repeated-bout effect: a single bout of unaccustomed eccentric work protects the muscle against the next, so that the same session repeated a week or two later produces much less soreness, strength loss and marker release, and the protection lasts for weeks; a trained lifter following a stable programme is rarely very sore for this reason, and the soreness returns with a new exercise, a new rep range or a return from a layoff, which is why soreness is managed by the programme rather than by the cupboard.

Should I take vitamin C and E or anti-inflammatories for sore muscles?

The high-dose antioxidant trials did not consistently reduce soreness and in several blunted the strength and endurance adaptation the sessions were producing, because the inflammatory signal the vitamins suppressed is part of how muscle adapts, so a stack bought against soreness costs gains; routine anti-inflammatory medicine for ordinary soreness rather than for an injury raises the same question and is one for a pharmacist, and the lifter's answer is to accept the soreness, keep the protein up and let the repeated-bout effect do the work.

Does magnesium help with DOMS?

Magnesium has authorised claims for normal muscle function, normal protein synthesis, electrolyte balance and the reduction of tiredness and fatigue, which describe the mineral's role in a working muscle, and no claim for soreness, recovery or inflammation, and the trials do not support one; this site's worked example is 300mg elemental at 80% NRV for 22p a day, batch tested for four metals and UK made, and a lifter whose plate is short of the mineral takes it for the plate and not for the second morning after a hard session.

Sources

1. The delayed onset muscle soreness mechanism review: soreness rises over the first day after unaccustomed or eccentric work, peaks between the first and third day and resolves within a week, driven by mechanical disruption of the fibre and connective tissue with an inflammatory response, not by lactic acid, and is weakly related to the damage markers measured in blood. PubMed record
2. The delayed-onset muscle soreness intervention literature: meta-analyses of tart cherry, curcumin, omega-3 and antioxidants report small and inconsistent reductions in soreness after unaccustomed exercise, with no effect on the recovery of strength large enough to change training, and with the repeated-bout effect of training itself the largest protection. PubMed record
3. The repeated-bout effect literature: a single bout of unaccustomed eccentric exercise protects the muscle against soreness, strength loss and marker release from a repeated bout for weeks afterwards, with the protection larger than any nutritional intervention trialled against delayed onset soreness. PubMed record
4. The antioxidant supplementation and training adaptation literature (Ristow and colleagues and later trials): high-dose vitamin C and E around training blunted markers of mitochondrial adaptation and insulin sensitivity gains, the finding that acute post-exercise inflammation is part of the adaptive signal rather than a problem to suppress. https://pubmed.ncbi.nlm.nih.gov/19433800/

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