Home › Magnesium Supplements › Magnesium Glycinate Powder

Last updated: August 2026

Key Features at a Glance

• 180–203mg elemental magnesium per 1g — declared openly, not hidden behind compound weight
• 18%–20.3% assay by ICP, per supplier technical dossier
• Chelated magnesium glycinate, CAS 14783-68-7
• Composition published in full: magnesium oxide 32%–37%, glycine 63%–68%
• 40 mesh — minimum 85% passing, free-flowing and uniform
• No fillers, no flow agents, no anti-caking agents, no additives
• No solvents used in manufacture
• Suitable for vegans and vegetarians
• Non-GM, non-irradiated, nanoparticle-free
• Free from all 14 declarable allergens
• Minimum 3-year shelf life from manufacture
• Resealable food-grade foil pouch on retail sizes
• Eight sizes: 50g, 100g, 250g, 500g, 1kg, 25kg, 50kg, 100kg
• Ten authorised GB nutrition claims for magnesium
• UK-held stock, same-day dispatch before 3:30pm Mon–Fri
• 5 Star Food Hygiene Rating, awarded by Southend-on-Sea City Council
• 160,000+ verified marketplace sales since 2016
• Subscribe and Save, plus three interest-free monthly payments at checkout

Contents — jump to a section

• What This Material Actually Is
• First-Time Buyer Guide
• Full Specification
• Microbiological & Heavy Metal Specification
• Pack Size Guide
• How Much Powder Per Day?
• How To Measure And Use It
• Subscribe & Save and Interest-Free Payments
• Authorised GB Nutrition Claims
• Powder, Capsules or Tablets?
• Where To Buy Magnesium Glycinate Powder UK
• Wholesale & Trade Supply
• Related Products
• Frequently Asked Questions
• What Our Customers Say
• Glossary
• Research References

Magnesium Glycinate Powder — also sold as magnesium bisglycinate powder — supplies chelated magnesium as a fine, free-flowing powder with nothing else added. Each gram delivers 180–203mg of elemental magnesium — 48% to 54% of the 375mg Nutrient Reference Value — and the assay range comes straight from the supplier's technical dossier rather than from a marketing figure.

If you are looking to buy magnesium glycinate powder UK stock with the elemental content stated plainly, this is a single-ingredient material with no proprietary blend and no bulking agents making up the weight. The powder is milled to 40 mesh, which is the standard particle size for supplement powders and makes it suitable for direct use, blending and capsule filling alike.

Magnesium carries ten authorised GB nutrition claims, more than almost any other mineral, covering nervous system function, psychological function, muscle function, energy metabolism, bones and teeth. Those claims are listed further down in their exact authorised wording, and at 180mg per gram this product clears the 15% NRV threshold required to make them several times over.

Stock is held at our own Southend-on-Sea facility, which holds a 5 Star Food Hygiene Rating awarded by Southend-on-Sea City Council. Orders placed before 3:30pm Monday to Friday dispatch the same working day, with free delivery on UK orders over £10.

What This Material Actually Is

Magnesium glycinate is made by reacting magnesium oxide with the amino acid glycine. The supplier technical dossier for this material states the composition as magnesium oxide 32%–37% and glycine 63%–68%, giving a finished assay of 18%–20.3% elemental magnesium by ICP.

We publish that composition rather than describing the powder only as "pure chelated magnesium", because the two figures together tell you something useful. A fully reacted magnesium bisglycinate chelate typically assays around 14% elemental magnesium. Material assaying 18%–20.3% is what the trade calls a buffered magnesium glycinate — a proportion of the magnesium is present as oxide rather than fully bound to glycine.

That is not a fault and it is not a hidden filler. It is a trade-off, and it runs in both directions:

• Buffered material delivers more elemental magnesium per gram — you need roughly 2g here for a full NRV, against nearly 2.7g of a fully chelated bisglycinate.
• Fully chelated material is generally chosen for digestive tolerance, because unreacted magnesium oxide is the component most associated with loose stools at higher intakes. Organic magnesium salts are generally reported as better absorbed than inorganic forms in the bioavailability literature (Schuchardt & Hahn, 2017).

If your priority is milligrams of magnesium per gram of powder, buffered material is the efficient choice. If you have found magnesium hard on your stomach in the past, a fully chelated bisglycinate may suit you better. We would rather you knew the difference than bought on the word "chelated" alone.

First-Time Buyer Guide

If you have not used a magnesium powder before, buy the 100g pouch and a cheap digital scale. Start at 1g daily — 180–203mg elemental magnesium, roughly half the NRV — taken with food at a consistent time. Stay there for a fortnight before deciding whether to increase.

Magnesium status responds to regular intake rather than to single large doses, so consistency matters more than the exact number. If you notice loose stools, reduce the serving; that is the usual sign of taking more than your gut is comfortable with, and it resolves quickly at a lower intake.

Once you know the powder suits you, the 500g and 1kg pouches bring the cost per gram down considerably, and Subscribe and Save takes another slice off if you are using it daily.

Full Specification

Product	Magnesium Glycinate Powder
CAS number	14783-68-7
Molecular formula	C4H8MgN2O4
Molecular weight	172.42 g/mol
Alternative names	Magnesium bisglycinate, magnesium diglycinate, magnesium glycine chelate
Elemental magnesium (assay)	18% – 20.3% (ICP)
Elemental magnesium per 1g	180 – 203mg (48% – 54% NRV)
Composition	Magnesium oxide 32%–37%, glycine 63%–68%
Production method	Chelated — magnesium oxide reacted with glycine, dried and milled
Appearance	White to off-white powder
Aroma	Characteristic mineral
Particle size	Minimum 85% passing 40 mesh
Loss on drying	Maximum 5%
pH	8 – 11
Solvents used	None
Fillers / flow agents / additives	None
Suitable for vegans / vegetarians	Yes
GM status	Not manufactured from GM raw materials
Irradiation	Non-irradiated
Nanoparticles	Free of nanoparticles
Allergens	None of the 14 declarable allergens
Shelf life	Minimum 3 years from manufacture
Packaging	Resealable food-grade foil pouch
Sizes	50g · 100g · 250g · 500g · 1kg · 25kg · 50kg · 100kg
Stock location	United Kingdom (Southend-on-Sea, Essex)
Wholesale available	Yes — bulk and white-label

Microbiological and Heavy Metal Specification

Supplier specification limits, tested by the methods shown. Batch-specific Certificates of Analysis are available on request.

Parameter	Specification	Method
Lead (Pb)	Less than 1 ppm	ICP-MS
Cadmium (Cd)	Less than 1 ppm	ICP-MS
Mercury (Hg)	Less than 0.1 ppm	DMA
Arsenic (As)	Less than 1 ppm	ICP-MS
Total viable count	Less than 5,000 cfu/g	USP <2021>
Yeasts and moulds	Less than 300 cfu/g	USP <2021>
E. coli	Negative	USP <2022>
Salmonella	Negative / 25g	AOAC 998.09 modified
Staphylococcus aureus	Negative	USP <2022>
Pseudomonas aeruginosa	Negative	USP <62>
Coliforms	Less than 10 cfu/g	AOAC 991.14

Pack Size Guide

Pack	Servings at 1g/day	Best for
50g	50 days	Trying it for the first time
100g	100 days	Recommended starting pack
250g	250 days	Established routine
500g	500 days	Better value per gram
1kg	1,000 days	Households, best retail value
25kg · 50kg · 100kg	Trade volumes	Manufacturers, formulators, packers

How Much Magnesium Glycinate Powder Per Day?

Most UK guidance is written in elemental magnesium, not powder weight, which is why the two rarely match. The NHS reference intake is 270mg a day for women and 300mg for men from all sources including food. The UK Expert Group on Vitamins and Minerals sets a guidance level of 400mg supplemental magnesium per day for adults. Here is what that means in powder:

If you want	Powder	Approx. teaspoon	% NRV
~100mg elemental	0.5g	⅛ tsp	24–27%
~200mg elemental	1g	¼ tsp	48–54%
~300mg elemental	1.5g	⅜ tsp	72–81%
~400mg elemental (EVM guidance ceiling)	2g	½ tsp	96–108%

Teaspoon figures are approximate. Powder density changes with settling and humidity, so a scale is more accurate — but the spoon guide is there if you do not have one to hand. Do not exceed 400mg supplemental elemental magnesium daily without advice from your GP.

How To Measure And Use It

1. Weigh it, don't spoon it. Powder density changes with settling and humidity, so a teaspoon is not a reliable measure for a mineral. A 0.1g resolution kitchen scale is enough.
2. Start at 1g daily — 180–203mg elemental magnesium, roughly half the NRV. Adjust from there once you know how it suits you.
3. Mix into water or juice and take with food — around 200ml of liquid per gram makes an easy magnesium glycinate powder drink. Magnesium is better tolerated alongside a meal.
4. Split larger servings across morning and evening rather than taking 2g at once.
5. Reseal and store cool, away from moisture and direct sunlight.

Magnesium glycinate powder has a mild, slightly alkaline taste — the specification pH is 8 to 11. Mixing it into juice rather than plain water suits most people.

Authorised GB Nutrition Claims For Magnesium

Magnesium's role in bone maintenance is one of the better-studied areas — the mineral is a structural component of bone and is involved in calcium regulation, as set out in the bone health review literature (Rondanelli et al., 2021). Dietary intake below reference levels is commonly reported among older adults across European populations (Barbagallo et al., 2021), and magnesium intake in women specifically has been reviewed across the lifespan (Porri et al., 2021).

Powder, Capsules or Tablets?

Consideration	Powder	Capsules or tablets
Serving control	Any amount you weigh out	Fixed per unit
Cost per gram	Lower — no encapsulation step	Higher
Convenience	Needs scales and a drink	Swallow and go
Taste	Mild, slightly alkaline	None
Formulation and blending	40 mesh, suitable	Not applicable
Bulk availability	Up to 100kg	Limited

If you want convenience over control, our magnesium glycinate capsules are the same family of material in a fixed serving.

Where To Buy Magnesium Glycinate Powder UK

You can buy magnesium glycinate powder UK stock directly from this page in eight sizes from 50g upward, with free delivery on UK orders over £10 and same-day dispatch before 3:30pm Monday to Friday. Subscribe and Save and three interest-free monthly payments are both available at checkout. If you would rather order magnesium glycinate powder UK through a marketplace with buyer protection, the same product is listed on our eBay store. Trade buyers looking for where to buy magnesium glycinate powder UK in volume should use the wholesale section below.

Related Products

• Magnesium Glycinate 650mg Capsules — fixed serving, vegan HPMC shell
• Magnesium Sleepy Time — evening magnesium formula
• B3 + Magnesium 750mg Capsules — magnesium with niacin
• NMN + Magnesium 800mg Capsules — NAD precursor with magnesium
• Triple Zinc + Copper Tablets — zinc with copper for balance
• Multivitamin & Mineral Tablets — broad daily base

Frequently Asked Questions

How much elemental magnesium is in this powder?

18% to 20.3% by weight. A 1g serving provides 180–203mg of elemental magnesium, which is 48%–54% of the 375mg NRV. Around 1.85g to 2.1g provides a full NRV.

Why does the specification list magnesium oxide and glycine?

Magnesium glycinate is manufactured by reacting magnesium oxide with glycine. The supplier technical dossier states the composition as magnesium oxide 32%–37% and glycine 63%–68%, which is the input ratio. We publish it because it is the honest description of the material and because it explains the elemental figure.

Why is the elemental magnesium higher than 14%?

A fully reacted magnesium bisglycinate chelate typically assays around 14% elemental magnesium. Material assaying 18%–20.3% is a buffered magnesium glycinate, meaning a proportion of the magnesium remains present as magnesium oxide rather than fully bound to glycine. Buffered material delivers more elemental magnesium per gram; fully chelated material is generally chosen for digestive tolerance.

What is 40 mesh and why does it matter?

40 mesh means the powder has passed through a sieve with 40 openings per linear inch. The supplier specification is a minimum of 85% passing 40 mesh. It produces a fine, uniform, free-flowing powder suitable for direct use, blending and capsule filling.

How do I measure a serving?

Weigh it on a digital scale. Powder density varies with settling and humidity, so spoon measures are unreliable for a mineral where the serving matters. A 0.1g resolution kitchen scale is sufficient.

What does it taste like?

Mild and slightly alkaline — the specification pH is 8 to 11. It is not bitter or sour. Most people mix it into juice or squash rather than plain water.

Should I choose powder or capsules?

Powder gives you full control over the serving and a lower cost per gram, but needs scales and a drink. Capsules are fixed-serving and more convenient. If you are new to magnesium and want simplicity, start with capsules. If you want to adjust your intake precisely or buy in volume, choose the powder.

Which pack size should a first-time buyer choose?

The 100g pouch is the usual starting point — around 100 servings at 1g daily. Regular users generally move to 500g or 1kg for better value per gram.

How much magnesium glycinate powder should I take per day?

Most UK guidance is given in elemental magnesium. 1g of this powder provides around 200mg elemental, 1.5g provides around 300mg, and 2g provides around 400mg — which is the UK Expert Group on Vitamins and Minerals guidance level for supplemental magnesium. The NHS reference intake from all sources is 270mg for women and 300mg for men.

How many teaspoons is a serving?

Roughly a quarter teaspoon per gram, so a half teaspoon is about 2g. Teaspoon measures are approximate because powder density changes with settling and humidity — weighing on a digital scale is more accurate.

Can I make it into a drink?

Yes. Stir your weighed serving into around 200ml of water or juice per gram and drink it. The powder has a mild, slightly alkaline taste rather than a bitter or sour one, so it mixes into squash or juice easily.

Is magnesium glycinate the same as magnesium bisglycinate?

The names are often used interchangeably. Strictly, bisglycinate means the magnesium is bound to two glycine molecules. Elemental magnesium content differs between fully chelated bisglycinate (typically around 14%) and buffered glycinate such as this material (18%–20.3%), so always compare on the elemental figure rather than the name.

Does this powder contain fillers or additives?

No. There are no flow agents, anti-caking agents, bulking agents or additives of any kind. The only ingredient is magnesium glycinate.

Is it suitable for vegans and vegetarians?

Yes. The supplier technical dossier confirms the material is suitable for both, is non-GM, non-irradiated and free from all 14 declarable allergens.

What is the shelf life and how should I store it?

A minimum of 3 years from date of manufacture. Store sealed in a cool, dry place away from moisture and direct sunlight, and reseal the pouch after every use.

How fast is UK delivery and what are your returns?

Orders placed before 3:30pm Monday to Friday dispatch the same working day from our Southend-on-Sea facility. Free shipping on UK orders over £10. Unopened items can be returned within 30 days.

Can I subscribe and save?

Yes. Subscribe and Save gives you a discount on every recurring order, delivered on a schedule you choose. You can change the frequency, skip a delivery, pause or cancel at any time from your account with no fee.

Can I spread the cost over three months?

Yes. Interest-free instalments are available at checkout on eligible orders, letting you split the cost into three monthly payments with no interest and no fees when you pay on time. The credit is provided by our third-party payment partner and is subject to their eligibility checks. Full terms are shown at checkout before you commit.

Do you supply magnesium glycinate powder wholesale in the UK?

Yes. We have supplied magnesium glycinate in the UK since 2016 and hold stock up to 100kg for trade, formulation and contract packing. Trade enquiries go through our contact page.

Is this material suitable for capsule and tablet manufacturing?

Yes. At a minimum 85% passing 40 mesh it is a free-flowing, uniform powder suitable for blending, encapsulation and tabletting. We encapsulate the same material in-house.

Can you provide a technical dossier or Certificate of Analysis for trade orders?

Yes. The full supplier technical dossier and batch-specific Certificates of Analysis are available on request for all trade and wholesale orders.

Do you offer white-label or private-label magnesium?

Yes. We run in-house encapsulation and can supply white-label and private-label magnesium products to your specification, in your own branding.

What are your trade lead times and bulk sizes?

Bulk sizes are 25kg, 50kg and 100kg from UK-held stock, so stocked lines dispatch same day with no import lead time. Bespoke white-label runs take longer depending on volume and packaging — contact us for a quotation.

What Our Customers Say

Read all reviews on Trustpilot →

Glossary

Elemental magnesium	The weight of actual magnesium in a compound, as distinct from the total compound weight. The figure that counts nutritionally.
Chelate	A mineral bound within an organic molecule — here, magnesium held by glycine.
Buffered	A glycinate in which part of the magnesium remains as oxide rather than fully bound to glycine, giving a higher elemental percentage.
NRV	Nutrient Reference Value — the labelling benchmark. 375mg per day for magnesium.
Mesh	Particle size measure — openings per linear inch in the sieve the powder passes through.
ICP / ICP-MS	Analytical methods used to measure mineral content and trace metals.
Loss on drying	Moisture content measure — lower means a drier, more stable powder.

Read our full magnesium guide on r/HealthByKnowledge →

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