Magnesium Bisglycinate vs Magnesium Glycinate: What's the Difference?

If you've been looking into magnesium supplements, you've likely come across both magnesium bisglycinate and magnesium glycinate. The names sound almost identical and in many cases they're used interchangeably. But there are meaningful differences worth understanding before you buy.

What is magnesium glycinate?

Magnesium glycinate is magnesium bound to glycine, an amino acid. The glycine binding makes it significantly more bioavailable than cheaper forms like magnesium oxide. Meaning more of it is actually absorbed and used by the body. It's well-tolerated, gentle on the digestive system, and widely used for sleep support, muscle relaxation, and stress management.

What is magnesium bisglycinate?

Magnesium bisglycinate is magnesium bound to two glycine molecules — hence "bis," meaning two. This double-chelated structure means it's even more stable in the digestive tract and may have superior absorption compared to standard glycinate. Some research suggests the bisglycinate form reaches target tissues more effectively because it's less likely to dissociate in the gut before being absorbed.

Which is better?

In practice, both forms are significantly superior to inorganic magnesium forms like oxide, sulphate, and carbonate, which are poorly absorbed and more likely to cause digestive discomfort. Between the two, magnesium bisglycinate has the edge in terms of stability and absorption efficiency. For people specifically targeting nervous system support, sleep quality, or stress response, bisglycinate is generally considered the premium choice.

Why we chose magnesium bisglycinate

In our Nervous System Support formula, we use magnesium bisglycinate specifically because we wanted the most effective form available, not the cheapest. When you're targeting a specific physiological outcome like nervous system regulation, form matters. A supplement that doesn't absorb properly doesn't work, regardless of what's on the label. At 116mg elemental magnesium per serving, our formula provides 31% of the Nutrient Reference Value, a significant daily contribution from a highly bioavailable source, designed to work alongside the other active ingredients in the formula.