Methylsulfonylmethane is a compound your body makes naturally, found in small amounts in foods, that some people take as a supplement to support joint and connective tissue health.
Methylsulfonylmethane, or MSM, is an organic sulfur compound present in plants, animals, and humans. Your body produces it in small quantities, and it also appears naturally in foods like garlic, onions, cruciferous vegetables, and some grains. When people talk about MSM as a wellness supplement, they are usually referring to a concentrated form taken as a powder or capsule, not the trace amounts you get from eating.
MSM became popular in wellness circles during the 1990s, largely through books and word-of-mouth, as people reported using it for joint discomfort, flexibility, and skin appearance. Today it remains one of the more commonly purchased supplements in the amino acid and connective tissue category, though the research picture is still developing and remains mixed on how much it actually does.
Key Takeaways
- MSM is a naturally occurring sulfur compound that your body makes in small amounts and that also appears in certain foods.
- People most often take MSM supplements to support joint health, flexibility, and connective tissue, though research on its effectiveness is still limited and inconsistent.
- MSM is generally considered safe by most people at typical supplement doses, but it can interact with blood thinners and may cause mild digestive upset in some users.
- There is no established recommended daily amount for MSM, and doses in supplements typically range from 500 to 3,000 milligrams per day.
What people use MSM for most often
The most common reason people take MSM is to support joint health and reduce joint discomfort, particularly in the knees, hips, and hands. Because MSM is a source of sulfur, which is a component of cartilage and connective tissue, the theory is that supplementing with it helps maintain or rebuild these structures. Some people also use it hoping to improve flexibility and range of motion, especially if they exercise regularly or have noticed stiffness with age.
Beyond joints, MSM shows up in supplements marketed for skin, hair, and nail health. The reasoning follows a similar logic: sulfur is part of collagen and keratin, so more sulfur might mean healthier skin and stronger nails. Some people also take it for general inflammation or to support recovery after physical activity, though these uses are less commonly studied than the joint-focused research.
What the research actually shows
The evidence for MSM is modest and mixed. Several small studies have found that people taking MSM reported less joint discomfort and better function compared to those taking a placebo, particularly in people with knee discomfort. However, these studies are often small, sometimes poorly designed, and the improvements reported are usually modest rather than dramatic. Many of the studies were also funded by companies that sell MSM, which can introduce bias into how results are interpreted.
Research on MSM for skin, hair, or nails is even thinner. A few small studies suggest it might support skin hydration or collagen production, but the evidence is not strong enough for any major health organization to make a recommendation. The bottom line: if you take MSM and notice a difference, that is real to you, but the scientific case for it is not yet solid, and it is not something a doctor would prescribe as a primary treatment for any condition.
How much MSM people typically take
There is no official recommended daily amount for MSM because it is not classified as an essential nutrient. Supplement doses vary widely, ranging from 500 milligrams to 3,000 milligrams per day, with many common products in the 1,000 to 2,000 milligram range. People usually take it as a powder mixed into water or juice, or as a capsule.
If you are considering taking MSM, starting with a lower dose and increasing gradually over a few weeks is a common approach, since some people report mild digestive effects when they first start. There is no research showing that higher doses work better than lower ones, so more is not necessarily more effective.
Safety and side effects to know about
MSM is generally considered safe for most people at typical supplement doses. The most common side effects are mild and digestive in nature: some people report bloating, gas, nausea, or loose stools, particularly when first starting. These effects usually fade within a few days as your body adjusts. Headaches and skin rash have been reported occasionally, though they are uncommon.
If you take blood thinners like warfarin or aspirin regularly, talk to your doctor before starting MSM, since sulfur compounds may have mild blood-thinning effects of their own. Pregnant or nursing people should also check with their healthcare provider first, since there is not enough research on MSM in these situations. If you have a sulfa drug allergy, MSM is not the same as a sulfa drug, but it is worth mentioning to your doctor since the relationship is not completely clear.
How MSM fits into a broader supplement routine
MSM is often sold alongside other joint-support supplements like glucosamine, chondroitin, and collagen. Some products combine them, while others are MSM alone. There is no research showing that combining MSM with these other compounds works better than taking any one of them, so the choice often comes down to cost, what you have tried before, and what your body tolerates well.
If you are already taking other supplements or medications, MSM is unlikely to cause problems with most of them, but it is worth mentioning to your doctor or pharmacist, especially if you are on blood thinners or have any chronic health conditions. Supplements are not regulated the same way medications are, so quality and purity can vary between brands—looking for products tested by a third party like NSF or USP can help you know what you are actually getting.
Where MSM comes from and what to look for
Most MSM sold as a supplement is made synthetically in a laboratory, not extracted from food sources. It is produced through a chemical process and then purified. This means the MSM in a supplement is chemically identical to what your body makes naturally, but it is not "natural" in the sense of being harvested from plants or animals.
When shopping for MSM, look at the label to see the amount per serving, check whether the product has been tested by a third party, and pay attention to the form—powder is usually cheaper per dose than capsules, but capsules are more convenient if you travel. Price varies widely, so comparing cost per milligram across brands can help you find a reasonable deal. Avoid products making dramatic claims about what MSM will do for you; if it sounds too good to be true, it probably is.
Frequently Asked Questions
Does MSM actually work for joint pain?
Some small studies show people taking MSM reported less joint discomfort than those on placebo, but the improvements are usually modest. Whether it will work for you is hard to predict—some people notice a difference after a few weeks, while others see nothing. It is not a replacement for medical treatment if you have a diagnosed joint condition.
Can I get enough MSM from food?
MSM appears naturally in foods like garlic, onions, and cruciferous vegetables, but in very small amounts. You would need to eat large quantities of these foods to match a typical supplement dose, so if you want to take MSM, a supplement is the practical way to do it.
How long does it take to notice a difference from MSM?
People who report noticing effects usually say it takes two to four weeks, though some say longer. There is no may provide you will notice anything at all. If you do not see a change after six to eight weeks, it may not be working for you.
Is MSM safe to take long-term?
There is no research showing harm from taking MSM for months or years at typical doses, and many people do take it long-term without problems. However, long-term safety studies are limited, so if you plan to take it indefinitely, checking in with your doctor periodically is reasonable.
Can I take MSM with other joint supplements?
Yes, MSM is often combined with glucosamine, chondroitin, or collagen in the same product. There is no research showing these combinations work better than single ingredients, but they are generally safe together. Check the label to make sure you are not accidentally doubling up on any ingredient.