Magnesium citramate is a dietary supplement that combines two organic forms of magnesium: magnesium citrate and magnesium malate. The name “citramate” is a blend of “citrate” and “malate,” reflecting the two acid compounds that magnesium is bound to in this formulation. It’s designed to offer the distinct benefits of both forms in a single capsule, primarily better absorption than basic magnesium oxide and support for both energy production and digestive regularity.
How Citramate Differs From Other Magnesium Forms
Most magnesium supplements use a single compound to deliver the mineral. Magnesium citrate pairs magnesium with citric acid. Magnesium malate pairs it with malic acid. Citramate uses both, creating a mixed salt where magnesium, citrate, and malate ions sit in a 5:2:2 molar ratio. In its solid form, it appears as a colorless to yellowish-white powder with a magnesium content of roughly 12 to 15% by weight.
The most widely available commercial version is Thorne’s Magnesium CitraMate. According to its label in the NIH Dietary Supplement Label Database, each capsule provides 135 mg of elemental magnesium, split between 55 mg from magnesium citrate and 80 mg from magnesium malate.
Why Two Forms Are Combined
The citrate and malate components each play a different role in the body, which is why they’re paired together.
The citrate portion is well known for its effect on the digestive system. It draws water into the intestines, which softens stool and stimulates the muscles that move it along. At supplement-level doses this effect is mild, nothing like the large liquid doses used for bowel prep before medical procedures. For people prone to constipation, the citrate component can keep things moving without harsh stimulation.
The malate portion is tied to cellular energy. Malic acid is a naturally occurring compound found in fruits (it gives green apples their tartness) and is a key player in the Krebs cycle, the process your cells use to convert food into usable energy. Magnesium itself is required for the enzymes that synthesize ATP, your body’s primary energy molecule. Binding magnesium to malic acid means both ingredients arrive together where mitochondria need them, supporting cellular respiration and muscle recovery.
Absorption Compared to Other Forms
One of the main reasons people choose citramate over cheaper options like magnesium oxide is absorption. Organic magnesium formulations, where the mineral is bound to a carbon-containing acid like citric or malic acid, generally have higher solubility in the gut than inorganic forms. Their absorption is also less dependent on stomach acid levels, which matters for older adults or anyone taking acid-reducing medications. A systematic review published in Nutrition Research confirmed that inorganic formulations appear to be less bioavailable than organic ones, and that the percentage of absorption is dose-dependent, meaning smaller doses are absorbed more efficiently.
Magnesium glycinate is the other popular organic form, often recommended for sleep and anxiety because glycine has calming effects on the nervous system. Citramate leans more toward energy and digestive support. Muscles may absorb magnesium citrate better than magnesium glycinate, making citramate a stronger choice if your primary concerns are muscle soreness, cramps, or fatigue rather than stress and sleep quality.
What It’s Used For
People take magnesium citramate for the same general reasons they take any magnesium supplement: to correct a shortfall in dietary intake. Most adults need between 310 and 420 mg of magnesium daily depending on age and sex, and many people fall short through diet alone. Dark leafy greens, nuts, seeds, and whole grains are the richest food sources, but modern diets often underdeliver.
Beyond filling that gap, citramate is commonly marketed for a few specific uses:
- Energy and fatigue. The malate component supports mitochondrial energy pathways, making this a popular choice for people who feel persistently tired or drained.
- Muscle recovery. Magnesium plays a central role in muscle contraction and relaxation. Combined with malic acid’s role in energy metabolism, citramate is often chosen by physically active people or those with frequent cramping.
- Mild constipation. The citrate component’s water-drawing effect provides gentle digestive support at typical supplement doses.
- Migraine management. Magnesium citrate in particular has been associated with migraine reduction, and some people choose citramate for this reason.
One claim that hasn’t held up well is the use of magnesium malate for fibromyalgia. A crossover double-blind trial tested a supplement containing 200 mg of malic acid and 50 mg of magnesium in fibromyalgia patients and found it made little or no difference in pain, trigger point severity, or pressure sensitivity. A systematic review rated this as high-certainty evidence, concluding the balance of benefits and risks was not favorable for that specific use.
Dosage and What to Expect
A typical serving of magnesium citramate is one to two capsules daily, providing 135 to 270 mg of elemental magnesium per dose. That covers roughly a third to two-thirds of most adults’ daily needs, with the rest coming from food. Splitting doses across the day can improve absorption since your gut absorbs smaller amounts more efficiently.
Most people tolerate citramate well. The most common side effect of any magnesium supplement is loose stools or mild abdominal discomfort, which tends to happen at higher doses, particularly from the citrate component. Starting with one capsule and increasing gradually helps your digestive system adjust. Taking it with food also reduces the chance of stomach upset.
People with reduced kidney function need to be cautious with any supplemental magnesium. Healthy kidneys excrete excess magnesium efficiently, but impaired kidneys can allow levels to build up. Anyone on medications that affect kidney function or mineral balance should check with a healthcare provider before adding magnesium to their routine.
How to Choose Between Citramate and Single Forms
If your main concern is constipation or bowel regularity, straight magnesium citrate gives you more of the osmotic effect per capsule. If you’re primarily looking for calm, better sleep, or anxiety relief, magnesium glycinate is the more targeted option. Citramate sits in a middle lane: it’s a good all-purpose choice for someone who wants energy support, mild digestive benefits, and solid absorption without needing to take multiple types of magnesium separately. The trade-off is that you get a moderate dose of each component rather than a full dose of either one.