Several natural substances can help relax muscles, though none work as quickly or powerfully as prescription muscle relaxants. Magnesium has the strongest biological basis, acting as a natural calcium channel blocker that directly influences how muscles contract and release. Other options, including curcumin, tart cherry juice, and topical remedies like Epsom salt baths, target muscle tension indirectly by reducing inflammation and soreness.
What works best depends on whether you’re dealing with tight, cramping muscles, post-exercise soreness, or chronic tension. Here’s what the evidence actually supports.
Magnesium: The Strongest Natural Option
Magnesium is the closest thing to a true natural muscle relaxer because it’s directly involved in the mechanism that makes muscles contract and relax. It works as a physiological calcium channel blocker. Calcium signals your muscle fibers to contract; magnesium counteracts that signal and helps them release. When magnesium levels drop too low, excess calcium floods into muscle cells, leading to cramps, spasms, and even vasospasms in blood vessels.
Beyond blocking calcium, magnesium also helps regulate the sodium-potassium pumps that keep your cells functioning normally, and it blocks certain pain receptors in the nervous system (called NMDA receptors), which adds a mild pain-relief effect on top of the muscle relaxation. There’s also evidence it protects muscle tissue from breaking down by counteracting calcium-triggered enzymes that degrade muscle protein.
Many people are mildly deficient in magnesium without knowing it. If your cramps or muscle tightness stem from low magnesium, supplementation can make a noticeable difference. The tolerable upper limit for supplemental magnesium is 350 mg per day for adults, according to the NIH. That limit applies only to supplements and medications, not magnesium from food. Leafy greens, nuts, seeds, and whole grains are all rich dietary sources that don’t count toward that cap. Common supplement forms include magnesium glycinate, which is gentler on the stomach, and magnesium citrate, which absorbs well but can have a laxative effect at higher doses.
Epsom Salt Baths: Do They Actually Work?
Epsom salt (magnesium sulfate) baths are one of the most popular home remedies for sore, tight muscles. The idea is that magnesium absorbs through your skin and relaxes muscles locally and systemically. Research confirms that magnesium ions can permeate the skin, with absorption facilitated particularly through hair follicles. Once absorbed, the magnesium works the same way it does when taken orally: reducing inflammation by inhibiting certain inflammatory signaling molecules and promoting muscle relaxation.
The practical effect is real for many people, even if the amount absorbed through the skin is modest compared to oral supplementation. Soaking a sore limb in an Epsom salt bath reduces stiffness and pain partly through the magnesium absorption and partly because warm water itself increases blood flow and loosens tight tissue. Think of it as a useful complement to dietary magnesium rather than a replacement.
Curcumin for Post-Exercise Soreness
Curcumin, the active compound in turmeric, won’t stop a muscle spasm in the moment, but it’s one of the better-studied natural options for reducing the soreness and damage that follow intense exercise. A meta-analysis published in PLOS ONE found that curcumin supplementation significantly reduced muscle soreness scores, with the effect growing stronger over time. At 24 hours post-exercise, soreness dropped modestly, but by 96 hours the reduction was substantial. The benefits were not significant immediately after exercise or beforehand, so this is a recovery tool, not a preventive one.
Curcumin also reduced markers of muscle damage in the blood, particularly in people who were untrained or new to a type of exercise. Interestingly, trained athletes didn’t see the same benefit, likely because their muscles are already adapted to handle stress. Doses under 1.5 grams per day appeared more effective than higher doses, suggesting more isn’t necessarily better. Curcumin is notoriously hard for the body to absorb on its own, so look for formulations designed for better bioavailability, often labeled as containing piperine (from black pepper) or using a specialized delivery system.
Tart Cherry Juice for Inflammation
Tart cherry juice has earned a solid reputation in sports nutrition for its antioxidant and anti-inflammatory effects. It works best as a planned recovery strategy rather than a quick fix. The typical protocol in studies involves drinking it daily for three to seven days before a hard workout or event, then continuing for two to four days afterward. On the day of exercise, it’s usually consumed one to two hours beforehand.
The most common dose is about 30 mL of concentrate twice daily (60 mL total), or roughly 240 to 355 mL of regular tart cherry juice twice a day if you’re using the non-concentrated version. The juice reduces inflammatory markers in the blood and helps with perceived soreness. It’s not going to relieve an acute cramp or spasm, but for ongoing muscle soreness from training or physical labor, it’s a reasonable and well-tolerated option.
Chamomile and Valerian: Relaxation, Not Muscle Relaxation
Chamomile and valerian root appear frequently in lists of natural muscle relaxers, but the evidence is weaker than many sources suggest. Chamomile contains a compound called apigenin that interacts with calming receptors in the brain (GABA receptors), producing a sedative effect. In animal studies, apigenin reduced locomotor activity and promoted sedation. That whole-body calming effect may indirectly ease muscle tension driven by stress or anxiety, but chamomile hasn’t been shown to directly relax skeletal muscle the way magnesium does.
Valerian root has been used traditionally for gastrointestinal spasms and general relaxation, but the NIH states that scientific evidence is not sufficient to support its use for muscle spasms. It may help you sleep, and better sleep certainly helps muscles recover, but calling it a muscle relaxer overstates what the research shows. Both chamomile and valerian are safe for most people and may contribute to overall relaxation, which can help with tension-type muscle tightness. Just don’t expect them to replace a more targeted approach.
CBD: Promising but Complicated
CBD has generated enormous interest for muscle tension and spasticity, but most of the clinical evidence involves combinations of CBD with THC rather than CBD alone. Studies on spasticity in multiple sclerosis, for example, used a combined THC/CBD spray and found it effective. Isolating CBD’s specific contribution to muscle relaxation is difficult based on current data.
Anecdotally, many people report that CBD oils, topicals, or capsules help with muscle tightness and soreness. The anti-inflammatory properties of CBD are well-documented in preclinical research. If you want to try it, topical CBD products applied directly to sore muscles are a low-risk starting point. Just be aware that regulation and quality control vary wildly across CBD products, and what works for one person’s muscle tension may not work for yours.
Matching the Remedy to the Problem
The best natural approach depends on what’s causing your muscle tightness. If you’re experiencing cramps or spasms, especially at night, magnesium deficiency is the most likely culprit and magnesium supplementation is the most direct fix. If your issue is soreness after exercise, curcumin and tart cherry juice have the most clinical backing for reducing inflammation and speeding recovery. For stress-related muscle tension (tight shoulders, clenched jaw, stiff neck), the calming effects of chamomile tea or a warm Epsom salt bath may help by dialing down your nervous system’s overall activation.
None of these options will match the speed or intensity of a prescription muscle relaxant like cyclobenzaprine, which works within an hour by acting on the central nervous system. Natural approaches tend to work gradually and are better suited for ongoing management than acute relief. Combining strategies often makes sense: regular magnesium supplementation for baseline muscle function, curcumin or tart cherry juice around periods of heavy physical activity, and Epsom salt baths for targeted soreness as needed.