Magnesium Glycinate vs. Magnesium Citrate: Understanding Your Options

The differences between magnesium forms are often overlooked. Magnesium is magnesium, right? Well, no, not necessary.

Here, we’ll break down magnesium glycinate and magnesium citrate, looking at how they’re absorbed, when each might be most useful, and what side effects to keep in mind. That way, you can make a more informed choice next time you’re scanning supplement labels.

Understanding the chemical differences

The key difference between these two supplements is what the magnesium is attached to — the compound that helps carry it into your body.

Magnesium glycinate is magnesium bound to glycine, an amino acid which plays a wide range of roles in the nervous system. Glycine on its own is linked to improved sleep quality, and thus it is assumed that magnesium glycinate is superior to other forms for bedtime routine.

Magnesium citrate is magnesium bound to citric acid. This form draws water into the intestines, creating an osmotic effect that explains magnesium citrate’s laxative properties.

Absorption comparison

“Both magnesium glycinate and citrate are organic forms and highly bioavailable, meaning they’re better absorbed than inorganic forms like magnesium oxide,” explains Taiyyibah Moughal, a Registered Dietitian.

So, both of these forms are great choices — however, glycinate tends to be gentler on your stomach, which is great if you have a sensitive gut. Citrate, on the other hand, can cause loose stools but usually only at higher doses.

When to choose magnesium glycinate

Choose magnesium glycinate if:

• You have a sensitive digestive system
• You are using magnesium for sleep or neurological support
• You want to raise magnesium levels without laxative effects

When to choose magnesium citrate

Choose magnesium citrate if:

• You're experiencing constipation or irregular bowel movements
• You want a more affordable magnesium option

Can magnesium help you even if you're not deficient?

According to Moughal, yes, it can be beneficial. This is a nuanced area where conventional medical testing doesn't always tell the complete story.

As per her insights, subclinical magnesium deficiency occurs more frequently than commonly recognized, due in part to modern food processing methods and the progressive reduction of mineral content in agricultural soils.

“Even in the absence of a formal deficiency, magnesium may support sleep, stress resilience, blood sugar regulation, and muscle function. In fact, athletes may require up to 10–20% more magnesium due to increased losses via sweat and higher metabolic demands,” highlights Moughal, who specializes in performance nutrition.

Dosage considerations

The appropriate dosage varies depending on your specific needs, health status, and which form you're taking. For the most suitable dosage for you, it is best to consult your healthcare provider.

For magnesium glycinate, a typical daily dosage is around 200 mg of elemental magnesium, which should be clearly stated on the supplement label.

Magnesium citrate is often taken in slightly lower doses when used as a daily supplement (150–300 mg), but much higher doses (typically 290 mg per serving or more) when used specifically as a laxative. Keep in mind that magnesium citrate should not be used daily as a laxative, just as an aid during occasional constipation.

Tolerable upper intake levels (ULs) for magnesium supplementation are 350 mg for adults.

Side effects to be mindful of

Side effects of magnesium can relate to the form of your choice.

“Magnesium citrate may cause diarrhea or GI discomfort — especially at higher doses or in those with sensitive stomachs,” says Moughal.

Glycinate is generally tolerated better, but some individuals may experience drowsiness when taken during the day.

As a safety precaution, Moughal recommends starting slow, with a lower dose, to assess tolerance. For quality, opt for a product with third-party testing (like NSF or USP).

Final thoughts

When choosing between magnesium glycinate and magnesium citrate, consider your specific health needs, digestive sensitivity, and intended use.

If gentle, highly-absorbable supplementation for sleep, stress, or general magnesium levels is your goal, glycinate is likely your best option. If addressing constipation is a priority, citrate is the one you should be looking at.