Magnesium citrate vs bisglycinate: which to choose and why?

In short:

• Magnesium citrate and magnesium bisglycinate are two well-absorbed forms of magnesium that differ in how they affect the digestive system.
• Citrate gently encourages bowel movements, so it suits those who also want digestive regularity.
• Bisglycinate is gentler on the stomach and is bound to glycine, which supports calm and sleep.
• The choice depends on your goal: bisglycinate for sleep and a sensitive stomach, citrate for general replenishment and digestion.

Magnesium citrate vs bisglycinate is one of the most common questions that comes up when choosing a magnesium supplement. Both forms are well absorbed, but they differ in how the digestive system handles them and in the goals they suit best. In this article we compare both forms, explain the differences and help you choose the most suitable option for your needs.

What is magnesium?

Magnesium is one of the most important minerals in the human body. It takes part in more than 300 enzymatic reactions: it is needed for muscle and nerve function, energy production, protein synthesis, bone strength and maintaining normal blood pressure. Adult men are recommended about 400–420 mg of magnesium per day, women about 310–320 mg. The body does not produce magnesium on its own, so it must be obtained from food or supplements.

Magnesium is abundant in green leafy vegetables, nuts, seeds, legumes, whole grains and dark chocolate. Still, some people get less from food than they need, so they turn to food supplements. Read more about the signs of magnesium deficiency in the article “Magnesium: when can it be deficient?”.

Magnesium deficiency can show up as muscle cramps, fatigue, irritability, sleep problems or an abnormal heart rhythm. However, these signs are not specific and may point to other conditions, so before starting supplements it is worth talking to a specialist. The market offers many magnesium forms – citrate, bisglycinate, oxide, malate, taurate and others – and each has its own characteristics, so it is worth understanding how they differ. Magnesium deficiency is more likely in older people, those who train hard, and those who take certain medicines or have digestive conditions.

What is magnesium citrate?

Magnesium citrate is magnesium bound to citric acid. It is one of the most popular and best-studied magnesium forms, with good absorption and a relatively affordable price.

The citric acid part gives magnesium citrate one more property – an osmotic effect. It draws water into the intestines, so higher doses of magnesium citrate can gently loosen stools. For this reason magnesium citrate is often chosen not only to replenish magnesium but also to regulate bowel movements.

Magnesium citrate is especially often recommended for people who want to replenish magnesium and support regular bowel movements with a single product. Thanks to good absorption and an affordable price, it is considered a universal choice that suits most adults.

In our shop you will find magnesium citrate, a single serving of which helps you conveniently replenish your daily magnesium reserves.

What is magnesium bisglycinate?

Magnesium bisglycinate is magnesium bound to the amino acid glycine. It is a chelated form that the body absorbs very well and that is gentle on the stomach.

Unlike citrate, bisglycinate has no osmotic laxative effect, so it is less likely to cause looser stools or stomach discomfort. In addition, glycine itself is a calming amino acid, so magnesium bisglycinate is often recommended before bed or in times of tension.

Because of its gentleness, magnesium bisglycinate is often chosen by people who experience stomach discomfort with other magnesium forms, or by those who take magnesium in the evening as part of a relaxation routine.

You will find this form in our magnesium bisglycinate supplement.

Magnesium citrate vs bisglycinate: absorption differences

Both forms – magnesium citrate and bisglycinate – have high bioavailability and are absorbed much better than inorganic forms, for example magnesium oxide. So when choosing magnesium it is worth paying attention to the form stated on the label, not just the milligram amount.

In practice the difference between these two forms shows up more in digestive sensations than in absorption efficiency. Citrate can gently loosen stools, while bisglycinate usually has no such effect and is better tolerated by people with a sensitive stomach. So when choosing between them it is worth considering not only absorption but also how your body reacts.

Magnesium citrate vs bisglycinate for sleep?

If you are choosing magnesium for sleep or relaxation, magnesium bisglycinate is usually the better option. The glycine in this form helps calm the nervous system and can help you sleep better. In addition, bisglycinate does not irritate the stomach, so it is convenient to take in the evening before bed. Magnesium supports a normal melatonin rhythm and muscle relaxation, while glycine helps slightly lower body temperature, making it easier to fall asleep – because of this combination of the two components, magnesium bisglycinate is often mentioned as one of the most suitable forms for an evening routine.

Magnesium citrate also suits general magnesium replenishment, but its laxative effect at night may be unwanted. Read more about the benefits of magnesium bisglycinate in the article “Magnesium bisglycinate: when is it worth choosing?”.

Magnesium citrate vs bisglycinate for digestion?

If you want more regular bowel movements, magnesium citrate is the better choice. Its osmotic effect gently stimulates intestinal activity, so this form is useful for constipation. However, it is important not to exceed the recommended dose, because too much can cause diarrhea.

Magnesium bisglycinate does not directly stimulate digestion, so it is often better tolerated by people with a more sensitive stomach. If your main goal is not bowel movements but simply general magnesium replenishment, both forms work, and bisglycinate can be more convenient if your stomach is sensitive.

It is also worth knowing that the laxative effect of magnesium citrate depends on the dose – small servings usually do not cause it, and the effect appears as the amount increases. So by adjusting the dose you can find the right balance between magnesium replenishment and comfort.

Magnesium citrate vs bisglycinate for muscles?

Magnesium is generally important for muscle function, cramp prevention and recovery after exercise. Both citrate and bisglycinate suit this goal – regularity and the right dose matter most.

During intense training some magnesium is lost through sweat, so physically active people should make sure they get enough. In that case you can choose either citrate or bisglycinate – the difference will depend more on whether you want an additional digestive or calming effect.

If sleep and overnight recovery also matter, bisglycinate can be a more convenient choice, because glycine supports calm. Read more about the benefits of magnesium for muscles in the article “Magnesium: 7 benefits for sleep, muscles and health”.

Side effects

The most common side effect of magnesium supplements is digestive discomfort. In higher doses, magnesium citrate can cause looser stools, diarrhea or bloating. Magnesium bisglycinate causes this effect less often and is usually considered one of the best-tolerated forms.

If diarrhea, stomach pain or nausea appears while taking the supplement, it is worth reducing the dose or switching to a gentler form. For most people, magnesium citrate or bisglycinate taken at recommended doses causes no discomfort.

In rare cases very high magnesium doses can cause nausea, low blood pressure or heart rhythm disturbances. But such effects occur almost exclusively when taking far too much or when kidney function is impaired. People with impaired kidney function should take magnesium supplements only under a doctor’s supervision.

Drug interactions

Magnesium supplements can interact with certain medicines. Tetracycline and quinolone antibiotics are less well absorbed when taken together with magnesium. Magnesium can also affect bisphosphonate absorption and interact with some diuretics.

In addition, long-term use of proton pump inhibitors can reduce magnesium absorption in the body. High doses of zinc can also compete with magnesium for absorption in the intestines, so when taking both minerals it may be sensible to separate them at different times of day. When taking a magnesium supplement, leave at least 2 hours between it and other medicines. If you take medicines or have kidney disease, be sure to talk to your doctor before starting supplements. Find more detailed information about magnesium in the NIH magnesium fact sheet.

How to take magnesium citrate and bisglycinate?

The recommended dose of magnesium supplements is usually 200–350 mg of elemental magnesium per day. The maximum safe supplement dose for adults, excluding magnesium from food, is 350 mg per day. Labels usually state the amount in milligrams of elemental magnesium.

Magnesium citrate is best taken with food to reduce stomach irritation. If your goal is digestive regularity, it can be taken in the evening. Magnesium bisglycinate is convenient to take in the evening before bed, with or without food.

If a single dose causes discomfort, the daily dose can be split into two parts – for example, morning and evening. This is especially relevant when taking magnesium citrate, because smaller servings are less likely to cause a laxative effect.

Start with a smaller dose and increase it gradually if needed. The most important thing is regularity: magnesium supplements are worth taking every day at the same time so that the body gets a stable amount of the mineral. How long you take magnesium depends on your goal – a few weeks or months may be enough to correct a deficiency, but before long-term use it is worth talking to a specialist.

Frequently asked questions

Does magnesium citrate loosen stools?

Yes. Magnesium citrate has a mild osmotic effect and in higher doses can loosen stools. If this effect is unwanted, choose magnesium bisglycinate, which usually has no such effect.

Which magnesium form is absorbed best?

Both magnesium citrate and bisglycinate are absorbed well – much better than magnesium oxide. Bisglycinate is usually considered one of the gentlest and best-tolerated forms, so it suits a sensitive stomach. When choosing, it is also worth checking whether the product states the amount of elemental magnesium rather than the weight of the whole compound.

Can you take magnesium citrate and bisglycinate together?

You can, but it is usually not necessary. It is better to choose one form according to your goal and stick to the recommended dose, because the total amount of magnesium should not exceed the safe limit.

When is the best time to take magnesium – morning or evening?

Magnesium bisglycinate is convenient to take in the evening because of the calming effect of glycine. Magnesium citrate can be taken at any time with food; if you take it for digestion, evening is usually better.

Does magnesium help with muscle cramps?

Magnesium contributes to normal muscle function, so its deficiency can be linked to cramps. If cramps keep coming back, it is worth checking your magnesium level and talking to your doctor.

Related articles

• Magnesium: 7 benefits for sleep, muscles and health
• Magnesium bisglycinate: when is it worth choosing?
• Magnesium: when can it be deficient?

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