What Is the Gentlest Form of Magnesium? (And Why It Matters for Digestion)

Magnesium is often recommended for everything from relaxation to cardiovascular support, but for some people, it doesn’t always feel that way.

Instead of helping, it can lead to bloating, urgency, or digestive discomfort.

It’s more common than you might think, and it doesn’t necessarily mean magnesium isn’t right for you.

In many cases, the difference comes down to something quite simple: the form you’re taking.

Types of Magnesium: What Are the Different Forms?

To keep it simple, most magnesium supplements fall into two broad categories:

Chelated Magnesium: Chelated magnesium refers to forms where magnesium is tightly bound to a compound such as an amino acid (for example, glycine or taurine) or an organic acid (for example, malic acid). This type of structure helps ‘hold’ magnesium in a more stable form, which supports absorption (1).

Magnesium Salts: These refer to magnesium bound to a carrier, forming salts such as magnesium oxide, chloride, sulfate, or citrate. Each can influence how much is absorbed and how they feel during digestion, but they are generally less well-absorbed compared to chelated forms (2,3).

How Different Magnesium Forms Compare

Here is a quick comparison of common magnesium types, including how well they are absorbed and how they affect digestion:

As you can see, some forms tend to be gentler on digestion, while others are more likely to cause digestive upset. Forms like magnesium citrate often sit somewhere in between.

So, what’s behind these differences?

Why Some Forms of Magnesium Are More Likely to Affect Digestion

Magnesium has a natural osmotic effect, meaning it draws water into the bowel (2).

In small amounts, this isn’t usually noticeable. But when magnesium isn’t well absorbed, more of it passes into the large intestine, where this effect becomes more pronounced.

This is when symptoms like looser stools can start to appear. Forms such as magnesium oxide are the most likely culprits, as they have a low absorption rate (2).

For some people, this effect can feel more noticeable, particularly if digestion is already sensitive or during periods of stress (4, 5).

Which Forms of Magnesium Are Best for Digestion?

Some of the most commonly used chelated forms include magnesium glycinate, magnesium taurate, and magnesium malate.

They are often chosen for slightly different reasons. For example, glycinate is often chosen for relaxation, taurate for cardiovascular support, and malate is often used earlier in the day for energy support.

The key takeaway here is that these forms are typically better absorbed, which is why they’re often gentler on digestion (2, 3). Magnesium glycinate is often considered one of the gentlest options.

This is where looking more closely at the label can be helpful.

What to Look for on a Magnesium Supplement Label

You might have come across terms like 'blended' or 'buffered' magnesium. These usually mean the product contains a mixture of forms. Blended formulas combine different types of magnesium, while buffered forms often include magnesium oxide alongside a more absorbable form.

While this can increase the total magnesium listed on the label, it doesn’t always reflect how much is actually absorbed.

Choosing clearly named chelated forms, such as magnesium glycinate, taurate, or malate, is often a good place to start if you are looking for a gentle magnesium supplement.

How to Take Magnesium Without Digestive Issues

If you choose to supplement, a few simple strategies can support absorption and minimise digestive discomfort, and help you get the most from your magnesium:

• Choose well-absorbed forms such as glycinate, taurate, or malate
• Start with a lower dose and increase gradually
• Split your intake across the day rather than taking it all at once
• Take magnesium with meals to improve tolerance

The right form can make all the difference between magnesium that disrupts digestion and magnesium that is both effective and well tolerated.

FAQs

What is the gentlest form of magnesium?

Magnesium glycinate is generally considered the gentlest, followed closely by magnesium taurate and malate.

Which magnesium does not cause diarrhoea?

Chelated forms like glycinate, taurate, and malate are least likely to cause diarrhoea.

Why does magnesium cause diarrhoea?

When magnesium isn’t fully absorbed, it draws water into the large intestine, leading to diarrhoea. Magnesium oxide is one of the most common examples, as it is relatively poorly absorbed. Magnesium sulfate is another form commonly used for its laxative effect. These are not always the best choice if you are looking for a daily magnesium supplement that is both well absorbed and gentle on digestion.

Can you take magnesium every day?

For most people, daily magnesium is safe when taken within recommended amounts. If you have a medical condition or are on any medications, we always recommend consulting your GP or pharmacist before commencing supplementation.

You might also enjoy reading

• What Are Chelated Minerals? Why Form Matters for Absorption
• Foods High In Magnesium
• 3 Ways to Lower Blood Pressure Naturally
• Signs You May Need More Magnesium

The Evidence

1. Philipp Schuchardt, J. and Hahn, A. (2017). ‘Intestinal absorption and factors influencing bioavailability of magnesium-an update’. Current Nutrition & Food Science, 13(4), p.260-278. https://doi.org/10.2174/1573401313666170427162740
2. Blancquaert, L., Vervaet, C. and Derave, W. (2019). ‘Predicting and testing bioavailability of magnesium supplements’. Nutrients, 11(7), p.1663. https://doi.org/10.3390/nu11071663
3. Sarić, M.M., Sorić, T., Kasap, Ž.J., Šikić, N.L., Mavar, M., Andruškienė, J. and Sarić, A. (2025). ‘Magnesium: Health Effects, Deficiency Burden, and Future Public Health Directions’. Nutrients, 17(22), p.3626. https://doi.org/10.3390/nu17223626
4. Ford, A. C., Sperber, A. D., Corsetti, M., and Camilleri, M. (2020). ‘Irritable bowel syndrome’. Lancet, 396(10263), p.1675–1688. https://doi.org/10.1016/S0140-6736(20)31548-8
5. Moloney, R.D., Johnson, A.C., O'mahony, S.M., Dinan, T.G., Greenwood‐Van Meerveld, B. and Cryan, J.F. (2016). ‘Stress and the microbiota–gut–brain axis in visceral pain: relevance to irritable bowel syndrome’. CNS Neuroscience & Therapeutics, 22(2), p.102-117. https://doi.org/10.1111/cns.12490