Magnesium glycinate vs citrate vs oxide comes down to absorption and comfort: glycinate and citrate are absorbed better than oxide in studies, so for most people topping up magnesium, one of those two is the better buy. Choose glycinate if you want something gentle to take in the evening, citrate for a well-studied everyday option, and think of oxide as the budget form your body absorbs least.
Magnesium has become one of the most popular health supplements in Australia, and for good reason. Whether you want to support your sleep, recover after training, manage a busy lifestyle or simply look after your overall health, magnesium is often one of the first supplements people ask us about.
But if you have ever searched for magnesium supplements, you have probably noticed there is not just one type. Glycinate, citrate, malate, L-threonate, oxide and more all promise different benefits, which makes it hard to know which one is right for you. In this guide, we explain what magnesium actually does, how the common forms differ, who might consider taking it, and how to choose the right option for your goals.
Magnesium glycinate vs citrate vs oxide at a glance
| Glycinate | Citrate | Oxide | |
|---|---|---|---|
| What it is | Magnesium bound to glycine, an amino acid | Magnesium bound to citric acid | Magnesium bound to oxygen (an inorganic salt) |
| Absorption in studies | Good. An amino acid chelate (the family glycinate belongs to) was absorbed better than oxide in a 60-day trial | Good. Absorbed better than oxide in several studies | Poor. About 4% was absorbed in one study |
| Stomach comfort | Usually gentle | Can loosen stools at higher doses | One of the forms most often linked to diarrhoea |
| Good for | Evening routines and sensitive stomachs | An everyday, well-studied top-up | Low cost, but not the first choice for topping up |
| Example at Supps247 | Nature Best Magnesium Glycinate, 200 mg magnesium per serve | Thorne Magnesium CitraMate (citrate plus malate), 135 mg per capsule | Mostly found in budget tablets and multi-form blends |
| Price at the time of writing | $24.95 (about $0.83 a serve) | $79.95 | Varies |
"Absorption" means how much magnesium gets from your gut into your body. The studies that measure it are small and mostly short, so read them as a guide rather than a final ranking. What they agree on is that oxide comes last.
What is magnesium?
Magnesium is an essential mineral that helps more than 300 enzyme systems do their job. It helps regulate muscle contractions, nerve function, energy production, protein synthesis and bone strength.
Magnesium is naturally found in foods like leafy greens, nuts, seeds, legumes and whole grains. Even so, the last national nutrition survey found about one in three Australians aged two and over (37% of males and 34% of females) did not meet their magnesium needs from food, with teenagers and older adults the most likely to fall short.
The NHMRC recommends 400 to 420 mg a day for adult men and 310 to 320 mg for adult women, from all sources. The upper level for magnesium from supplements is 350 mg a day for adults, because more than that can cause diarrhoea. Magnesium from food does not count towards that limit.
Benefits of magnesium: what the research says
Sleep quality
Magnesium supports normal nervous system function, and many people take it as part of their evening routine. Magnesium glycinate is a popular pick for this because it combines magnesium with glycine, an amino acid often linked with relaxation.
The research is promising but modest. In a 2025 trial of 155 adults who reported poor sleep, 250 mg of magnesium a day from magnesium bisglycinate improved insomnia scores slightly more than a placebo over four weeks. The effect was small, and people who ate less magnesium to begin with seemed to benefit most.
Muscle function and recovery
If you train regularly, magnesium plays an important role in normal muscle contraction and relaxation, and you lose a little through sweat. This is why many athletes include magnesium alongside protein and electrolytes in their routine. The main benefit is making sure you are not running low, rather than a special recovery effect.
Muscle cramps
Cramps can happen for many reasons, including fatigue, dehydration and electrolyte imbalance. A 2020 Cochrane review found magnesium is unlikely to make a meaningful difference to ordinary muscle cramps in older adults, and it found no good trials on exercise-related cramps. If you cramp often, talk to your GP rather than relying on a supplement.
Energy production
Magnesium helps convert carbohydrates, fats and proteins into usable energy. Low magnesium intake may contribute to tiredness in some people, particularly if their diet has been low in magnesium for a long time. If your intake is already good, extra magnesium is unlikely to give you more energy.
Stress response
Magnesium supports normal nervous system function and is commonly included in wellness routines designed to help you wind down. Research on stress and mood is mixed, so think of it as part of a good routine rather than a fix on its own.
Bone health
About 50 to 60% of the body's magnesium is stored in bone. Alongside calcium and vitamin D, magnesium contributes to maintaining healthy bones throughout life.
Which type of magnesium is right for you?
Choosing the right form depends on your goals and how your stomach handles it. Whatever you pick, look for the elemental magnesium on the label (the actual magnesium), not just the weight of the whole compound.
Magnesium glycinate (bisglycinate)
Best for: evening routines, relaxation and sensitive stomachs.
Magnesium glycinate is one of the most popular forms because it is well absorbed and generally gentle on the stomach. It is a bulky compound, so 2,000 mg of magnesium bisglycinate gives about 200 mg of actual magnesium. Nature Best Magnesium Glycinate gives 200 mg of magnesium per two-capsule serve for $24.95 (30 serves). Beast Labs Magnesium Bi-Glycinate 750mg, one of our best-selling magnesium supplements over the last six months, gives 150 mg per capsule for $29.95, or about $0.50 a serve.
Magnesium citrate
Best for: an everyday, well-studied top-up.
Magnesium citrate is well absorbed and commonly used as an everyday magnesium supplement. In a 60-day trial comparing citrate, an amino acid chelate and oxide, citrate gave the highest blood magnesium levels. Citrate draws water into the bowel, so larger doses can loosen stools. If that happens, split your dose across the day. Thorne Magnesium CitraMate combines citrate with malate for 135 mg of magnesium per capsule. Its label allows up to three capsules a day (405 mg), which is above the 350 mg upper level, so keep to two capsules or fewer unless your doctor advises more.
Magnesium oxide
Best for: a low-cost option, but not the first choice for topping up.
Oxide is cheap and packs a lot of magnesium into a small tablet, which is why it is common in budget tablets and multi-form blends. The catch is absorption. One study measured only about 4% of the magnesium in oxide being absorbed, and in the 60-day trial above, oxide did not raise magnesium levels more than a placebo. Oxide is also one of the forms most often linked to diarrhoea. When comparing labels, check which form is listed in the ingredients.
Magnesium malate
Best for: active people who want an alternative to citrate.
Malate is magnesium bound to malic acid, which plays a role in the body's energy cycle. That is why it is often chosen by physically active people, although there is little direct research showing malate works better than other well-absorbed forms.
Magnesium L-threonate
Best for: people interested in brain and cognitive support.
This newer form became popular after research in rats found it raised magnesium levels in the brain. Human research is still small and early, and it gives less magnesium per serve than other forms. Life Extension Neuro-Mag Magnesium L-Threonate gives 144 mg of magnesium per three-capsule serve, at about $3.33 a serve, so it costs more than glycinate or citrate.
Multi-form powders
If you prefer a drink, ATP Science MAG X4 combines bisglycinate, threonate, citrate and orotate for 150 mg of magnesium per scoop, at $39.95 for 40 serves. Our MAG X4 guide explains the mix in more detail.
How much to take, when, and who should consider it
Magnesium may suit gym-goers, endurance athletes, shift workers, busy professionals, older adults and anyone whose diet is low in magnesium. If you are not sure whether you are low, our post on signs of magnesium deficiency is a good starting point.
- Dose: most supplements give 100 to 250 mg of magnesium per serve. Stay within 350 mg a day from supplements unless your doctor advises more, and count any magnesium in your electrolytes, pre-workout or multivitamin.
- Timing: take it in the morning with breakfast, after training, or before bed if it is part of your evening routine. Consistency is generally more important than exact timing.
- Every day: for most healthy adults, magnesium can be taken daily when used according to the directions on the label.
- Stacking: magnesium sits well alongside protein powder, creatine, electrolytes, fish oil, greens powders, vitamin D, zinc and collagen.
If you have kidney disease or another medical condition, are pregnant, or take regular medicines, talk to your GP or pharmacist before starting. Magnesium can interact with some antibiotics and osteoporosis medicines, and the risk of too much magnesium rises when the kidneys are not working well.
Choosing a quality magnesium supplement
Not all magnesium supplements are equal. When shopping, look for:
- The form named on the label, such as glycinate, citrate or malate
- Elemental magnesium per serve, not just the compound weight
- A dose that keeps you within 350 mg a day from supplements
- Transparent ingredient labels and trusted brands
- Third-party tested products where available
We stock a wide range of magnesium from trusted Australian and international brands in our magnesium range. For our top picks side by side, see the best magnesium supplements in Australia guide.
Final thoughts: which magnesium should you choose?
For most people, magnesium glycinate is the easy pick: well absorbed, gentle on the stomach and suited to an evening routine. Beast Labs Magnesium Bi-Glycinate is the better value per serve of the two glycinates above, while Nature Best gives a higher 200 mg dose. Choose citrate if you want a well-studied everyday form and your stomach handles it. Skip oxide if your goal is to top up your levels, and pick L-threonate only if you are happy to pay more for a form with early research behind it.
Whichever form you choose, food comes first, and taking the right dose consistently matters more than finding the perfect form.
How our price compares
Here is what the same products cost at other Australian supplement stores, so you can check the difference yourself.
| Product | Supps247 | Nutrition Warehouse | ASN | Elite Supps | Supplement Mart |
|---|---|---|---|---|---|
| ATP Science MAG X4 100 g (40 serves) | $39.95 | $39.95 | $31.96 (sale) | Not listed | $39.95 |
Supps247 prices come from our website. Other prices were checked on the websites of Nutrition Warehouse, Australian Sports Nutrition (ASN), Elite Supps and Supplement Mart on 29 October 2026 (same product and size, price for one unit) and can change at any time. Sale means it was on sale that day. Not listed means we could not find that exact product on their site. Supps247 members can use our Price Match Guarantee against Nutrition Warehouse, ASN, Elite Supps and Supplement Mart: we beat their full price by 5% or match their sale price (conditions apply).
Shop the products in this guide
Beast Labs Magnesium Bi-Glycinate 750mg$29.95
Nature Best Magnesium Glycinate$24.95
Thorne Magnesium CitraMate$79.95
ATP Science MAG X4$39.95
Browse all magnesium supplements.
FAQs
Is magnesium glycinate or citrate better?
Both are well absorbed, so either is a good choice for topping up magnesium. Glycinate is usually gentler on the stomach and is popular in the evening. Citrate has more head-to-head research and gave the highest blood magnesium in one 60-day trial, but it can loosen stools at higher doses. If your stomach is sensitive, start with glycinate. If you want a well-studied everyday form, citrate works well.
Is magnesium oxide a waste of money?
Not completely, but it is the weakest choice for raising your magnesium levels. One study found only about 4% of the magnesium in oxide was absorbed, and a 60-day trial found it did no better than a placebo. Oxide is cheap and appears in many budget tablets and blends, so check the form on the label. Glycinate and citrate usually give you more for your money.
How much magnesium should I take a day in Australia?
The NHMRC recommends 400 to 420 mg a day for adult men and 310 to 320 mg for adult women, from food and supplements together. The upper level for magnesium from supplements is 350 mg a day for adults, as higher amounts can cause diarrhoea. Most supplements give 100 to 250 mg per serve. Check the elemental magnesium on the label and count any in your electrolytes or multivitamin.
What is the best time to take magnesium?
There is no single best time. Many people take magnesium glycinate in the evening as part of a wind-down routine, while others take it with breakfast or after training. Taking it consistently each day matters more than the exact time. If magnesium upsets your stomach, take it with food or split the dose into two smaller serves.
Does magnesium glycinate help you sleep?
It may help a little. A 2025 trial in adults who reported poor sleep found 250 mg of magnesium a day from magnesium bisglycinate improved insomnia scores slightly more than a placebo over four weeks. The effect was small, and people with lower magnesium intake from food seemed to benefit most. If poor sleep is ongoing, talk to your GP.
Sources: NHMRC Nutrient Reference Values: magnesium; ABS Australian Health Survey: Usual Nutrient Intakes 2011-12; NIH Office of Dietary Supplements: magnesium fact sheet; Firoz and Graber (2001), bioavailability of magnesium preparations; Walker et al. (2003), magnesium citrate vs amino acid chelate vs oxide; Schuster et al. (2025), magnesium bisglycinate and poor sleep; Garrison et al. (2020), Cochrane review: magnesium for muscle cramps; Slutsky et al. (2010), magnesium L-threonate in rats; product labels and brand nutrition panels, checked October 2026.
Order online with Australia-wide delivery, free on orders of $99.99 or more, with Afterpay available at checkout. You can also use click and collect at a store that offers it, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person. Members can use our member price match on full-priced items.
Prices and stock were checked on 29 October 2026 and can change at any time. Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.
