A complete safety, timing, and dosage guide for combining Magnesium (Citrate, Glycinate, Oxide, Threonate) with MSM (Methylsulfonylmethane) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take magnesium and MSM together safely. These two supplements do not interfere with each other, so you can add MSM to your current routine without concern.
Taking magnesium and MSM together is considered safe for most adults; no known interaction exists between these two supplements. While magnesium is a mineral and MSM is a sulfur compound, they do not compete for absorption or disrupt each other's functions. There is no evidence that magnesium and MSM together reduce the benefits of either supplement.
Magnesium is a positively charged mineral absorbed in the small intestine via active transport (TRPM6/7 channels) and passive diffusion, requiring gastric acid for optimal dissolution. MSM is an organic sulfur compound that is water-soluble and absorbed directly through the gut lining, then rapidly converted to sulfate for use in the body. Because MSM relies on passive absorption while magnesium uses dedicated mineral transporters, there is no competition between them. Neither compound induces or inhibits the cytochrome P450 enzymes, so no metabolic interference is expected. The only practical overlap is that both can cause mild stomach upset if taken in very high doses on an empty stomach, but this is not a true interaction.
For most healthy adults, taking magnesium and MSM together in the morning with breakfast is convenient and effective. If you prefer to space them, there is no required interval, though thirty minutes apart can help you notice how each one feels. Pair MSM with food to reduce mild nausea, especially if you are new to it. For magnesium, opt for a chelated form like glycinate or citrate and avoid taking it at the same time as a calcium supplement to maximize absorption. If you take a larger magnesium dose, split it into smaller amounts in the morning and evening to improve tolerance.
Magnesium citrate, glycinate, and threonate are well absorbed and less likely to cause loose stools, while magnesium oxide is poorly absorbed and often acts as a laxative. MSM has no active form variation, as it is a single compound. If you are already taking magnesium glycinate, it is gentle on the stomach and pairs easily with MSM. If you use magnesium threonate for cognitive benefits, it is equally compatible with MSM. The form of magnesium is far more relevant for tolerance than any interaction with MSM.
Yes, you can take them at the same time. In my clinical experience, I recommend combining them with a meal or a smoothie, and there is no reason to space them out. Their absorption pathways are independent, so neither blocks or reduces the other.
Yes, daily use is safe for most healthy adults. I suggest following the doses on the product labels and staying within the recommended range for elemental magnesium. Since they don't interact, you can make them a daily part of your routine without worry.
You don't need to wait at all. There is no interaction between them, so you can take one right after the other or at separate meals if that is more convenient. I usually tell patients to just take both with food to avoid stomach irritation.
No, they do not compete. Magnesium is absorbed through dedicated mineral channels in the small intestine, while MSM passes across the gut lining passively because it is water-soluble. Taking them together will not reduce the amount of either that enters your body.
Most people can take this combination safely. I advise extra caution if you have advanced kidney disease, if you take blood thinners, or if you are pregnant and haven't cleared it with your obstetrician. Outside of those groups, no specific population needs to avoid this pairing.
I recommend taking both with food. While magnesium citrate and MSM are often fine on an empty stomach, eating reduces the chance of nausea or loose stools. If you take magnesium glycinate in the evening, a light snack is enough to keep it gentle.
Reviewed by Caroline M. on April 8, 2026 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.