Magnesium Bisglycinate vs Glycinate: What's the Difference?

If you’ve compared two magnesium supplements and seen “magnesium glycinate” on one label and “magnesium bisglycinate” on another, the honest answer is the reassuring one: they’re the same compound. Both describe magnesium bound to the amino acid glycine — a chelate prized for being well absorbed and easy on the stomach.

The “bis-” prefix isn’t a different ingredient or a premium upgrade. It’s chemistry shorthand. So if the words alone have you stuck at the shelf, you can relax: you’re choosing between two names for one thing. What actually matters — absorption, dose, and how the rest of the formula is built — comes next.

What “bisglycinate” actually means

Magnesium carries a +2 charge, which means it can bond with two glycine molecules at once. “Bis-” simply means two. So magnesium bisglycinate spells out the full structure — one magnesium ion, fully chelated by two glycines — while magnesium glycinate is the everyday short form of the same molecule.

Think of it like “sodium bicarbonate” versus “bicarb”: one is precise, one is casual, both name the thing already in your cupboard.

Absorption and gut tolerability

The reason this chelate is popular has nothing to do with the name. Binding magnesium to glycine helps it stay stable through digestion, so it tends to be well absorbed and gentle — far less likely to cause the loose stools associated with cheaper forms such as magnesium oxide.

That said, “well absorbed” isn’t a magic phrase. The amount of elemental magnesium per serving, the dose you take, and your own physiology all shape how you respond. A clearly-labelled elemental magnesium figure tells you more than the word “bisglycinate” on its own.

Why labels say one or the other

If they’re identical, why the inconsistency? Two reasons, both mundane:

• Familiarity. “Glycinate” is shorter and shoppers recognise it, so marketing teams favour it.
• Precision. “Bisglycinate” is the accurate chemical descriptor, so labels aiming for transparency use it.

Neither word signals higher quality by itself. What’s worth checking is the rest of the label: elemental magnesium per serving, whether it’s fully chelated, and what else is in the capsule.

What Oh!Mg uses — and why more than one form

Oh!Mg uses magnesium bisglycinate as its headline form, precisely for that absorption-and-tolerability profile. But it doesn’t stop there: it pairs bisglycinate with magnesium lactate and magnesium taurate, plus lemon balm, L-theanine, vitamins B6 and B5, and zinc.

The reasoning is simple and honest: different magnesium forms behave differently in the body, and an evening formula built for winding down benefits from covering more than one pathway. Bisglycinate does the heavy lifting on absorption; the other forms and botanicals round it out. One name on a label was never the whole story.