What’s the Best Form of Magnesium?

Best Form of Magnesium

What’s the best form of magnesium? It depends on what you need. But for precise dosing, we love this magnesium powder

So you know you want to take a magnesium supplement, but you’re not sure which one is best for you? That’s what we’re here for – we break it down below.

For us, we realized that there are some incredible sleep benefits to Magnesium, which is discussed in our Best Sleep Aid buyer’s guide. But we wanted to go further for the other benefits as well!

It turns out that different types of magnesium have different benefits, so our goal is to get you the right one. If you want to learn about what magnesium is and does in your body, click here to skip down to the what is magnesium section.

What are the various forms?

Looking through the vitamin store’s aisles, you’ll be bombarded by several different forms, yet not really know which is “best” for you to take.

This is important to know before buying, because some of the “benefits” of one type (such as laxation) can be considered a “side effect” if that’s not what you wanted!

Fear not! First we break down the various forms, then we discuss which one to try depending on the benefits you’d like:

  • Magnesium Oxide

    Magnesium Oxide (MgO) is simply magnesium bonded to oxygen. This is the cheapest form of magnesium supplement and has the lowest bioavailability, at only around 4-5%.[7]

    Although it’s cheapest, it’s ultimately the one least worth it! So save your money and bypass any product that uses this form of magnesium.

  • Magnesium Citrate

    Magnesium Citrate

    Magnesium citrate is the most common form found in magnesium supplements and it has a high bioavailability!

    This is far and away the most common form of Mg on the market. Here, magnesium is bonded to citric acid. The end result is higher bioavailability, around 35-40%, most likely due to its increased water solubility.[9,10]

    One of the most popular magnesium supplements, Natural Calm, comes from “Ionic magnesium citrate”.

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  • Magnesium Aspartate

    Magnesium bonded to the amino acid L-Aspartate. It has a higher bioavailability than Magnesium Oxide, but lower than Magnesium Citrate.[10,11]

    There are practically no standalone magnesium aspartate products, though. The good news is that they’re often paired with potassium (which we’re almost always happy to get more of), and marketed as bone supplements:

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    But there’s another way to get in your Aspartate… and it’s as popular as it is effective.

    Look at ZMA to add in Zinc and B6

    This is the form most frequently used in ZMA supplements. These contain a standardized blend of zinc monomethionine and aspartate (30 mg), magnesium aspartate (450 mg), and vitamin B6 as pyridoxine hydrochloride (10.5 mg).

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    To read more, you can see the ZMA Section in our Best Sleep Aid guide.

  • Magnesium Dihydroxide (Milk of Magnesia)

    Here we take magnesium oxide and add a couple of hydrogen molecules giving us the chemical formula, MgOH2. This form is also known as Milk of Magnesia, and is most often used as a laxative.[8]

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  • Magnesium Diglycinate

    This form of magnesium is different from the other forms in that it’s absorbed in a different area of the intestines.[12] It also has a higher bioavailability than Magnesium Oxide.

  • Magnesium Orotate

    Orotic Acid is bonded to magnesium gives us the unique form of magnesium. It appears to help blood flow in the body, but it’s absorption rate in the body hasn’t been well documented. More likely than not, you won’t come across many supplements using this version.

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  • Magnesium L-Threonate

    Our final form of magnesium is one of the newer and less known about versions. L-Threonate is a metabolite of Vitamin C that is currently being researched for its ability to increase bioavailability of various minerals.[12]

    It’s been suggested that this has a higher bioavailability than Magnesium Citrate, but there isn’t enough data to prove this hypothesis one way or another.

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  • What is Magnesium Asporotate?

    Don’t confuse Magnesium Asporotate with Magnesium Aspartate.

    The Asporotate form is a cleverly-named mixture of Magnesium Aspartate, Magnesium Citrate, and Magnesium Orotate. There aren’t many products like this, so we don’t have a separate category on PricePlow for them.

    If you want to try this to get the “best of all worlds”, one such product is Solaray’s Magnesium Asporotate:

    Solaray Magnesium Asporotate

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What about Chelated Magnesium?

Chelated Magnesium

Chelated Magnesium is simply magnesium bonded to an ionic salt to increase its bioavailability in the body, ensuring maximum absorption.

Ah, you may have heard of chelated magnesium before. quite possibly when looking at the various forms of creatine, as in Magnesium Creatine Chelate. So, what the heck is it?!

Chelated magnesium is simply a term used when magnesium is bonded to a negatively charged ion (an anion). Some common examples of this include Magnesium Citrate and Magnesium Glycinate. The purpose of this is to increase the bioavailability of magnesium and ensure that it “survives” passing through the stomach and passes to the small intestine, where it’s absorbed for use in the body.

So what is the best magnesium?

As always, when someone asks for the “best”, the answer is, “it depends on what effects you want”, as well as how much you’re willing to spend.

So we break down the general benefits / desired effects, and you can choose the right one for you, with PricePlow comparisons linked above:

  • Overall health and wellness

    Look for a magnesium supplement that uses Magnesium Citrate or Magnesium Aspartate, as they have the higher levels of bioavailability than many of the other forms.

    Recommended dosage: 400mg/day

  • Improving sleep

    Again, look for a sleep based product that utilizes the citrate or aspartate forms as they have the highest absorption rate.[14,15]

    Due to the fact that so many ZMA users report wonderful sleep, we recommend magnesium aspartate (or simply finding a good ZMA supplement) for better sleep.

    Note that ZMA users also report extremely vivid dreams — this comes from the Vitamin B6 that’s in the ZMA formula, not the magnesium. Some love this effect, but some don’t, so consider ZMA supplementation with that in mind.

    Recommended dosage: 450mg as part of ZMA formula

  • Learning Improvement

    Brain Power

    Looking to boost brain power? Go with Magnesium L-Threonate as it increases magnesium levels in the brain, which boosts learning!

    If you’re looking to boost brain power, you may want to consider Magnesium L-Threonate. There’s been some interesting research showing this particular form increases brain magnesium levels which improves learning.[17,18]

    Recommended dosage: 50mg/kg elemental magnesium (604mg/kg Magnesium-L-Threonate)

  • GI Distress

    Go with Milk of Magnesia, Magnesium Dihydroxide, as it’s the most commonly used form of magnesium in laxatives.

    Recommended dosage: 250-1000mg

What about the laxative issue?

Sooner or later, most of us will suffer from some form of constipation, and we’ll need a little assistance getting things running smoothly again. Magnesium is one of the most common laxatives both for its effectiveness and cost-efficiency.

Now, in terms of dosage, what’s the proper amount?

Magnesium Periodic Table

There are TONS of magnesium supplements on the market, but which is best? We answer that question today!

There is no “ideal” dosage for everyone unfortunately, as magnesium’s laxative effects are going to be dependent on your daily water and fiber intake. That being said, it’s generally recommended to start around 250mg of magnesium and gradually increase the dosage to 500-1000mg based on your body’s response to increased amount.

If you have nice, smooth (i.e. no hard lumps or straining) bowel movements, you know the dosage is right. If you’re running to the bathroom every 30 minutes and shooting out liquids, you know you need to dial the dosage back a good bit.

The soft stool test

The “soft stool test” is also a good barometer for anyone dosing magnesium. Keto dieters, for instance, are known to slowly bump up their magnesium dosing until they have wetter stool (but not diarrhea). You will obviously know when you’ve dosed too far!

Where powders are king

For anyone who wants to drill down to a very specific dose, powdered magnesium supplements may be the way to go. Thousands of reviewers have enjoyed a supplement such as Natural Calm Magnesium, which is a flavored powder you can take before bed.

We wish we could simply give you a dose that will work for everyone, but that’s simply not how it works. If you have severe constipation and 1g of magnesium isn’t doing anything, it’s likely time to seek a doctor’s attention and consider stopping whatever is originally causing your bowel issues.

What about Calcium and Magnesium?

Human Skeleton

Calcium and magnesium are both involved in bone formation, but taking them together doesn’t necessarily equal better absorption.

Due to both minerals’ role in bone formation and metabolism, calcium and magnesium are sometimes combined in a single supplement. This may not be the most optimal dosing protocol to follow though as these two minerals compete for the same absorption pathway. When dosed together, calcium absorption seems to be impaired.[16]

If you are already deficient in calcium, taking a combined calcium-magnesium supplement could lead to further deficiency issues due to the malabsorption of calcium. For this reason, it may be best to take your calcium and magnesium supplements separately.

What is Magnesium?

Magnesium is a mineral that is abundant in the body and wide variety of foods, particularly leafy greens and nuts. Next to calcium, magnesium is the second most abundant mineral in the body,[4] and the second most common nutrient deficiency in people,[6] mostly due to diet. It is required in over 300 processes in the body including:

  • Protein synthesis[1,2,3]

  • Energy production[1,2,3]

  • Blood glucose control[1,2,3]

  • Blood pressure regulation[1,2,3]

  • Muscle contracts[5]

These are just a few of the many roles that magnesium plays in the body. As you can see just from this sampling, ensuring that your stores of magnesium are topped off is crucial to not only performing well in the gym, but maintaining overall health. That is why we created this page – to get the right form in your hands.


Well, there you have it! Hopefully we’ve convinced you of how important magnesium is not only to you athletic pursuits but your overall health. If you are highly active, or don’t eat enough veggies and nuts, it’s vital for you to invest in a quality magnesium supplement to make sure you’re replenishing your body’s stores of this mineral.

Make sure to check the widget below for the best deal on any and all magnesium supplements!

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  1. Institute of Medicine (IOM). Food and Nutrition Board. Dietary Reference Intakes: Calcium, Phosphorus, Magnesium, Vitamin D and Fluoride. Washington, DC: National Academy Press, 1997.
  2. Rude RK. Magnesium. In: Coates PM, Betz JM, Blackman MR, Cragg GM, Levine M, Moss J, White JD, eds. Encyclopedia of Dietary Supplements. 2nd ed. New York, NY: Informa Healthcare; 2010:527-37.
  3. Rude RK. Magnesium. In: Ross AC, Caballero B, Cousins RJ, Tucker KL, Ziegler TR, eds. Modern Nutrition in Health and Disease. 11th ed. Baltimore, Mass: Lippincott Williams & Wilkins; 2012:159-75.
  4. Iotti S, Malucelli E; In vivo assessment of Mg2+ in human brain and skeletal muscle by 31P-MRS . Magnes Res. (2008)
  5. Stephenson EW, Podolsky RJ; Regulation by magnesium of intracellular calcium movement in skinned muscle fibers . J Gen Physiol. (1977)
  6. Jacka FN, et al; Association between magnesium intake and depression and anxiety in community-dwelling adults: the Hordaland Health Study . Aust N Z J Psychiatry. (2009)
  7. Firoz M, Graber M; Bioavailability of US commercial magnesium preparations . Magnes Res. (2001)
  8. Hendry PO, et al; Randomized clinical trial of laxatives and oral nutritional supplements within an enhanced recovery after surgery protocol following liver resection . Br J Surg. (2010)
  9. Lindberg JS, et al; Magnesium bioavailability from magnesium citrate and magnesium oxide . J Am Coll Nutr. (1990)
  10. Walker AF, et al; Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study . Magnes Res. (2003)
  11. Mühlbauer B, et al; Magnesium-L-aspartate-HCl and magnesium-oxide: bioavailability in healthy volunteers . Eur J Clin Pharmacol. (1991)
  12. Schuette SA, Lashner BA, Janghorbani M; Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection . JPEN J Parenter Enteral Nutr. (1994)
  13. Zeana C; Magnesium orotate in myocardial and neuronal protection . Rom J Intern Med. (1999)
  14. Sato-Mito N, et al; The midpoint of sleep is associated with dietary intake and dietary behavior among young Japanese women . Sleep Med. (2011)
  15. Takase B, et al; Effect of chronic stress and sleep deprivation on both flow-mediated dilation in the brachial artery and the intracellular magnesium level in humans . Clin Cardiol. (2004)
  16. Basso LE, et al; Effect of magnesium supplementation on the fractional intestinal absorption of 45CaCl2 in women with a low erythrocyte magnesium concentration . Metabolism. (2000)
  17. Slutsky I, et al; Enhancement of learning and memory by elevating brain magnesium . Neuron. (2010)
  18. Abumaria N, et al; Effects of elevation of brain magnesium on fear conditioning, fear extinction, and synaptic plasticity in the infralimbic prefrontal cortex and lateral amygdala . J Neurosci. (2011)
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