Is magnesium bisglycinate the same as magnesium glycinate?

Are Bisglycinate and Glycinate the Same?

Yes. Magnesium bisglycinate and magnesium glycinate are the same compound: a magnesium ion chelated (bonded) to two glycine molecules. Every product sold as “magnesium glycinate” is, chemically, magnesium bisglycinate. The two names refer to the same structure and the same product.

The confusion arises because both terms appear on supplement labels, often from different manufacturers, creating the impression that they might refer to different things. They do not. Whether the label says “magnesium bisglycinate,” “magnesium glycinate,” “magnesium diglycinate,” or “magnesium amino acid chelate (glycinate),” the underlying chemistry is the same.

This is not a minor terminological nuance — it is a question people search for thousands of times per month because the answer is not obvious from the labels themselves, and because buying the wrong supplement is easy when the naming appears inconsistent.

The Chemistry Behind the Names

Magnesium in its ionic form (Mg²⁺) has a positive charge of 2+. To be stable and usable as a supplement, it needs to be bonded to a carrier molecule or ion. In the case of glycinate/bisglycinate, that carrier is glycine — the simplest amino acid.

Glycine has a carboxylate group (–COO⁻) that carries a negative charge. A single glycine molecule carries one negative charge; magnesium needs two negative charges to achieve electrical neutrality. Therefore, magnesium glycinate is always bonded to two glycine molecules — which is precisely what “bis” means: two.

The full technical name is bis(glycinato)magnesium. In practice:

• “Magnesium glycinate” = magnesium bonded to glycine (implied: two molecules, since that is the only stable form)
• “Magnesium bisglycinate” = magnesium bonded to two glycine molecules (explicit: stating the “bis” makes the chemistry precise)

Both are equally correct names for the same molecule. “Bisglycinate” is the more chemically precise term; “glycinate” is more commonly used in consumer marketing. Neither name implies higher or lower quality.

Why Two Names Exist

The dual naming reflects the different communities that have used this compound over time. Food scientists and nutritional biochemists tend to use the precise chemical name “bisglycinate.” Consumer supplement marketers tend to use the shorter “glycinate.” The EFSA (European Food Safety Authority) standardised terminology uses “magnesium bisglycinate” in its safety assessments.

Some confusion also stems from a distinction that does exist in chelated amino acid minerals more broadly: the difference between a “monohydrate” form (one amino acid) and a “chelate” form (two amino acids). For magnesium glycinate specifically, the two-amino-acid (bis) form is the only commercially relevant version, so the distinction does not arise in practice. But awareness of this distinction from other minerals (such as zinc monomethionine vs zinc bis(glycinate)) may lead some consumers to wonder if the same distinction applies to magnesium glycinate. It does not.

Does the Name Difference Matter for Quality?

No. Whether a product says “bisglycinate” or “glycinate” tells you nothing about quality. What matters for quality is:

• The elemental magnesium content: Magnesium bisglycinate/glycinate is approximately 14% elemental magnesium by weight. A 400mg capsule therefore provides around 56mg of elemental magnesium. Always check the elemental content — this is the number that determines the therapeutic dose, not the compound weight.
• Third-party testing: Independently verified purity and elemental content, confirming the product contains what the label claims.
• Manufacturing standards: GMP-certified and ISO-certified facilities ensure consistent quality and freedom from contaminants.
• Absence of unnecessary fillers: A quality magnesium glycinate should contain minimal additives. Anti-caking agents and a capsule shell are expected; unnecessary artificial colours, sweeteners, or undisclosed binders are not.

The name — bisglycinate or glycinate — is not a quality signal. A poorly made “bisglycinate” is worse than a well-made “glycinate.” Focus on testing and manufacturing standards, not the specific name variant on the label.

How Does It Compare to Other Forms?

Understanding the bisglycinate/glycinate naming also helps contextualise how this form compares to other magnesium forms:

• Magnesium oxide: Magnesium bonded to oxygen. Very high elemental magnesium by weight (~60%) but absorbs at approximately 4–10%. Inexpensive and widely used in budget supplements. Not appropriate for sleep or deficiency correction.
• Magnesium citrate: Magnesium bonded to citric acid. Absorbs at approximately 16–30%. A decent general form; often causes loose stools at higher doses as it draws water into the gut.
• Magnesium taurate: Magnesium bonded to taurine. Well absorbed. Delivers taurine alongside magnesium, providing additional cardiovascular and GABA-modulating benefits. See our comparison post: magnesium taurate vs bisglycinate.
• Magnesium lactate: Magnesium bonded to lactic acid. Well tolerated and reasonably well absorbed. Often used as a third component in multi-form formulas.
• Magnesium threonate: A patented form designed to cross the blood-brain barrier. Studied primarily for cognitive applications. Significantly more expensive.

Bisglycinate/glycinate is broadly considered the best all-round form for systemic deficiency correction, sleep, and muscle relaxation because of its high absorption, excellent tolerability, and the secondary sleep-promoting effects of the glycine it carries.

What to Look for on a Supplement Label

When buying magnesium glycinate or bisglycinate, the label should tell you:

• The specific form: “Magnesium bisglycinate,” “magnesium glycinate,” or “magnesium amino acid chelate (glycinate)” — all fine. Avoid products that only say “magnesium” without specifying the form (usually means oxide).
• Elemental magnesium content: Look for this stated explicitly. A product providing 400mg of magnesium bisglycinate per capsule should state “providing X mg elemental magnesium” — typically around 56mg for bisglycinate at 400mg compound weight.
• Third-party testing: A certificate of analysis from an independent lab, or a statement of third-party testing, confirms the elemental content and absence of contaminants.
• Manufacturing credentials: GMP-certified and ideally ISO9001-certified facility.

Oh!Mg uses magnesium bisglycinate as one of its three magnesium forms, alongside magnesium taurate and magnesium lactate, for a total of 306mg of elemental magnesium per serving from well-absorbed sources. All NMN Bio products are third-party tested at a GMP and ISO9001-certified UK facility.

Which Is Better for Sleep?

Since bisglycinate and glycinate are the same compound, the real question is how this form compares to others for sleep. The answer: bisglycinate/glycinate is the best single-form choice for sleep, primarily because of glycine.

Glycine taken before bed has been shown in randomised controlled trials to reduce time to sleep onset and improve subjective sleep quality, independent of magnesium status. It does this by lowering core body temperature — one of the physiological cues that triggers sleep onset — and by acting as an inhibitory neurotransmitter in the spinal cord. No other magnesium carrier molecule has this property.

Combining bisglycinate with magnesium taurate — which adds the cardiovascular calming and GABA modulation of taurine — gives the most complete sleep coverage. For the full comparison of these two forms, see magnesium taurate vs bisglycinate. For the detailed glycine sleep mechanism, see magnesium bisglycinate for sleep.

Frequently Asked Questions

Is magnesium bisglycinate the same as magnesium glycinate?

Yes, completely. Both names refer to magnesium bonded to two glycine molecules. “Bisglycinate” is the more chemically precise term; “glycinate” is the shorter consumer-facing name. The chemistry, absorption, and effects are identical.

What is the difference between magnesium glycinate and bisglycinate?

There is no functional difference. The names refer to the same compound. If a product claims to be superior because it uses “bisglycinate” rather than “glycinate” or vice versa, this is a marketing claim without scientific basis — the molecule is the same.

Is magnesium bisglycinate better than magnesium glycinate?

They are the same compound. No form of one is better or worse than the other. What differs between products is quality (third-party testing, manufacturing standards, elemental magnesium content) — not the bisglycinate vs glycinate naming.

What does magnesium bisglycinate do?

It delivers well-absorbed elemental magnesium (at approximately 14% of compound weight) alongside two glycine molecules. The magnesium supports sleep, anxiety reduction, blood pressure, energy production, muscle relaxation, and over 300 other enzymatic processes. The glycine independently supports sleep onset and collagen synthesis. The combination is particularly effective for sleep and muscle recovery. For the full breakdown, see magnesium bisglycinate for sleep.

How much magnesium bisglycinate should I take?

For sleep and general deficiency correction, aim for 100–200mg of elemental magnesium daily from bisglycinate. This means roughly 700–1,400mg of the magnesium bisglycinate compound (at 14% elemental content). Check the label for elemental content — this is the clinically relevant dose measure, not the compound weight.