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Magnesium Citrate

Guides and comparisons Multivitamins: how to compare daily vitamin & mineral formulas

Magnesium citrate on this shelf comes as tablets, capsules and powders, some combined with vitamin B6 or other minerals. A label can print two numbers that look alike: the weight of the magnesium citrate compound (for example 2,667 mg) and the magnesium it contains (400 mg); compare the magnesium line. The serving is also not always one unit: it can be two tablets, three capsules or a scoop. The table below prices three products per 100 mg of declared magnesium, the same unit as the magnesium glycinate comparison; it is a unit price for comparing labels, not a dose.

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Portion prices are calculated from the net contents. Portion sizes differ between products; this is not a dosing recommendation. Read the full ingredients and directions on the product label.

Price per 100 mg magnesium = portion price ÷ declared magnesium per portion (mg) × 100.

High Strength Magnesium (as Citrate), 400mg - 90 tablets Holland & Barrett High Strength Magnesium (as Citrate), 400mg - 90 tablets Magnesium Citrate, 400mg - 120 vcaps NOW Foods Magnesium Citrate, 400mg - 120 vcaps Magnesium Citrate, Pure Powder - 227 grams NOW Foods Magnesium Citrate, Pure Powder - 227 grams Magnesium (Citrate), 100mg - 100 vcaps Life Extension Magnesium (Citrate), 100mg - 100 vcaps
Pack size 90 tablets 120 capsules 227 g 100 capsules
Main ingredients Magnesium citrate Magnesium citrate Magnesium citrate Magnesium citrate
Label portion 2 tablets 3 capsules 3 g 1 capsules
Declared magnesium per label portion 400 mg 400 mg 450 mg 100 mg
Pack price €6.99 €18.99 €17.99 €13.99
Price per portion €0.16 €0.47 €0.24 €0.14
Price per 100 mg magnesium €0.04 €0.12 €0.05 €0.14
Allergen information See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement.
Certifications — — GMP UL Certified —
Label information Label information Label information Label information Label information

Authorised EU Health Claim (HC-092 • Reg. (EU) 432/2012)

“Magnesium contributes to normal muscle function”

Conditions of use: The claim may be used only for food which is at least a source of magnesium as referred to in the claim SOURCE OF [NAME OF VITAMIN/S] AND/OR [NAME OF MINERAL/S] as listed in the Annex to Regulation (EC) No 1924/2006.

A varied, balanced diet and a healthy lifestyle are important.

Prices include VAT for Ireland. Courier delivery: €6.99; free from €65.00. Estimated delivery: 2–4 working days.

Product facts checked: 2026-10-28.

Frequently asked questions

What is the difference between "magnesium citrate 2,667 mg" and "magnesium 400 mg" on a label?

The first is the weight of the compound (magnesium bound to citric acid), the second is the magnesium itself. One capsule label in the table, for example, lists 400 mg of magnesium from 2,667 mg of magnesium citrate per 3 capsules. Compare the magnesium line.

Can I compare magnesium citrate with magnesium glycinate by price?

Yes, on the declared magnesium. Both comparison tables price 100 mg of magnesium, so the figures can be read side by side. The compound bound to the magnesium differs; the tables do not rank them.

Why do serving sizes differ so much between products?

One product counts two tablets as a serving, another three capsules, another a 4.2 g scoop of powder. The price per serving and the magnesium per serving are therefore not comparable until you look at both; the table shows them next to the unit price. Follow each label's own serving and maximum.