Best Magnesium for Menopause: Which Form, How Much, and When to Take It
By Andrea Donsky | Fact Checked | Sources
If you have typed "best magnesium for menopause" into Google at 3am, you already know the problem. There are at least nine forms on the shelf, the labels all sound the same, and half the articles about them are trying to sell you something. This is the honest version: which form we recommend and why, how much, when to take it, what to check on a label, and where the research is thinner than the marketing.
The short answer
- Form: magnesium bisglycinate (you will also see it written as glycinate or diglycinate). It is well absorbed and is the form least likely to send you running to the bathroom.
- How much: women 31 and over need about 320 mg a day from all sources. If you are adding a supplement, the National Institutes of Health puts the ceiling for supplemental magnesium at 350 mg a day unless a doctor tells you otherwise. Morphus Magnesium is 300 mg per serving.
- When: evening, with food.
- Check first if: you take antibiotics, bisphosphonates, thyroid medication or a proton pump inhibitor, or you have kidney concerns. Magnesium interacts with all of those.
Why magnesium keeps coming up in perimenopause
Magnesium is involved in more than 300 processes in the body. It contributes to normal muscle function, normal energy metabolism, normal nervous system function and normal psychological function (EFSA Panel on Dietetic Products, Nutrition and Allergies, EFSA Journal 2009;7(9):1216 and 2010;8(10):1807). Roughly half of adults in the US get less than the recommended amount from food alone (National Institutes of Health, Office of Dietary Supplements, Magnesium Fact Sheet for Health Professionals).
Perimenopause does not create a magnesium deficiency. What it does is pile up the things magnesium is involved in: broken sleep, tense muscles, a racing mind at night, and a nervous system that feels like it has lost its off switch. That is why so many women in our community say magnesium was the first supplement that made a noticeable difference, and why it is the one we get asked about most.
The forms, compared honestly
Every form of magnesium is the mineral attached to something else. The something else decides how well it absorbs, how it sits in your stomach, and what it is usually taken for.
- Magnesium bisglycinate (glycinate): magnesium bound to glycine, an amino acid. Well absorbed, gentle on the stomach, and the form most often chosen for evening use. This is the form in Morphus Magnesium and in Sleepus.
- Magnesium citrate: magnesium bound to citric acid. Also well absorbed. In one comparison of forms it was the most bioavailable of those tested (Walker AF, Marakis G, Christie S, Byng M, Magnesium Research 2003;16(3):183-191). Its downside is that at higher doses it loosens the bowels, which some women want and many do not.
- Magnesium malate: bound to malic acid. Well absorbed and gentle. Often taken during the day.
- Magnesium chloride: the form in most topical sprays and oils, and in some oral products. Reasonable absorption.
- Magnesium oxide: the cheapest and the most common form in drugstore tablets. It is also the least absorbed of the common forms (Firoz M, Graber M, Magnesium Research 2001;14(4):257-262). It is used for occasional constipation precisely because most of it stays in the gut.
- Magnesium sulfate: Epsom salt. Fine in a bath. Not something to swallow for a daily dose.
- Magnesium taurate, orotate and threonate: specialty forms, each studied for a specific purpose that is not sleep or general menopause support. If you have been advised to take one of these, follow that advice. For most women in perimenopause they are not where to start.
Is magnesium glycinate good for menopause? What bisglycinate does and does not do
This is the question we get asked most, usually phrased as "is magnesium glycinate good for menopause" or "magnesium bisglycinate benefits for women". Here is the straight version.
What the form changes: absorption and comfort. Glycine is a small amino acid, so magnesium bound to it is taken up well. In a small trial in people with part of the small intestine removed, magnesium bisglycinate was absorbed better than magnesium oxide (Schuette SA, Lashner BA, Janghorbani M, Journal of Parenteral and Enteral Nutrition 1994;18(5):430-435). That was a study of absorption in a surgical population, not a menopause study, and it is the honest basis for saying bisglycinate is well absorbed and easy on the stomach. It is why we chose it.
What the form does not change: what magnesium is for. Every form delivers the same mineral, and the mineral's job is the one described above: normal muscle function, normal nervous system function, normal energy metabolism and normal psychological function. You will read online that bisglycinate lowers blood pressure or blood sugar. We used to say that on this site too, and we took it down. Those studies were done in people with a diagnosed condition, with several different forms of magnesium, and none of them tested bisglycinate against a menopause symptom. If your blood pressure or blood sugar is a concern, that is a conversation with your doctor, not a supplement decision.
Glycine itself is sometimes taken on its own before bed, and the 300 mg of magnesium bisglycinate in Morphus Magnesium carries a small amount of it. It is not a reason to expect a stronger effect. Treat it as a pleasant side detail, not a benefit.
What the sleep research actually says
This is where we would rather be straight with you than sell to you. The best-known trial gave 500 mg of magnesium a day for eight weeks to older adults who had trouble sleeping and measured improvements in sleep time and how quickly they fell asleep (Abbasi B, Kimiagar M, Sadeghniiat K, et al., Journal of Research in Medical Sciences 2012;17(12):1161-1169). It was small, 46 people, and it was not a menopause study. A systematic review of the trials that exist found the evidence for magnesium and sleep in older adults to be low quality overall (Mah J, Pitre T, BMC Complementary Medicine and Therapies 2021;21:125). On everyday stress and tension, a review of 18 studies called the results promising but the studies weak (Boyle NB, Lawton C, Dye L, Nutrients 2017;9(5):429).
So the honest position is this: magnesium contributes to normal muscle and nervous system function, most of us do not get enough from food, and a well-absorbed form taken in the evening is a low-risk thing to try. It is not a sleeping pill and nobody should tell you it is.
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How much to take
The Recommended Dietary Allowance for women aged 31 and over is 320 mg a day, counting food. The tolerable upper limit for magnesium from supplements is 350 mg a day for adults (National Institutes of Health, Office of Dietary Supplements). Food does not count toward that ceiling, supplements do. Morphus Magnesium is 300 mg of magnesium bisglycinate chelate per serving, which sits under the limit on its own. If you also take Sleepus, which contains magnesium as well, count it toward the 350 mg. The Sleepus page explains how to combine the two.
Signs you may be low include muscle cramps, tingling, fatigue and an irregular heartbeat. Those are also signs of other things, so a blood test through your doctor is the only way to know.
When to take it, and with what
- Evening, with food. Bisglycinate is gentle, but any magnesium sits better with a little food than on an empty stomach.
- Same time every night. The trials that showed anything ran for four to eight weeks of daily use. Give it a month before you decide.
- Space it from certain medications. Magnesium can reduce absorption of some antibiotics (quinolones and tetracyclines), bisphosphonates for bone density, and levothyroxine. Take them at least two hours apart. Long-term proton pump inhibitor use can lower magnesium levels. If you take any of these, talk to your pharmacist first.
- High-dose zinc: very large zinc doses, around 140 mg a day, reduced magnesium absorption in one older study (Spencer H, Norris C, Williams D, Journal of the American College of Nutrition 1994;13(5):479-484). Ordinary multivitamin amounts are nowhere near that. If you take a high-dose zinc supplement, take it at a different time of day.
- Kidney concerns: the kidneys clear excess magnesium. If yours do not work normally, do not add a magnesium supplement without your doctor's say-so.
What to look for on the label
- The form, named. "Magnesium" on its own usually means oxide. Look for bisglycinate, glycinate or chelate spelled out.
- Elemental magnesium per serving. That is the number that counts. Some labels list the weight of the whole compound, which is much higher and not what your body gets.
- What else is in it. Morphus Magnesium is 300 mg of magnesium bisglycinate chelate and nothing else. If a label has a long list underneath the magnesium, ask what each thing is doing there.
Food sources, because those count too
Dark leafy greens, beans and lentils, pumpkin seeds, almonds, cashews, bananas, dried figs and dark chocolate are all good sources. A supplement fills the gap; it does not replace the plate.
Bottom line
If you want one answer: magnesium bisglycinate, 300 mg, in the evening with food, every night for at least a month. It is the form we chose for Morphus Magnesium because it absorbs well and sits easily in the stomach, and because it is the one women in perimenopause keep telling us they can actually stick with.
Shop Morphus Magnesium
300 mg of magnesium bisglycinate chelate per serving and nothing else. Formulated to support normal muscle function and relaxation, helping the body wind down for sleep.
Shop Magnesium →These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
