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

They sound different, but they’re not: “Magnesium Glycinate” and “Magnesium Bisglycinate” are interchangeable terms used to describe the same form of magnesium. Think of it like “fridge” and “refrigerator.” One’s easier to say, but they’re the same thing. (“Bis” means “two,” reflecting the fact that magnesium naturally binds to two glycine molecules.)

Quality + Transparency

Since glycinate and bisglycinate are the same, quality and transparent labeling should be the factors that guide your decision when selecting a magnesium glycinate supplement.

Here’s what to look for on the label:

Full label transparency: Look for brands that clearly state both the total elemental amount of magnesium and the specific forms used in the formula.

For example: Pure Lab Vitamins Magnesium Glycinate 165 mg (magnesium glycinate 70%, magnesium oxide, l-glycine dry chelate 30%). Clear breakdowns help you understand exactly what you’re getting.

Elemental magnesium amount per serving: This is the actual amount of magnesium in the magnesium compound.

For example: Magnesium 165 mg (magnesium glycinate and magnesium oxide).

Fully disclosed non-medicinal ingredients:

For example: 100% vegi-caps, magnesium stearate

Reliable quality standards: Third-Party tested, Certified GMP (Good Manufacturing Practices). For more on these designations, check out our blog.

At Pure Lab Vitamins, we prioritize formulation integrity and transparency—so you know exactly what you’re taking. We also keep terminology clear, accurate, and science-based—because understanding your supplement should be simple.