Compare every Magnesium product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Essential mineral involved in 300+ enzymatic reactions
We rank Magnesium by price per 375mg - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
What it is
Magnesium is an essential mineral, which is a nutrient the body needs to function but cannot make on its own. It is involved in more than 300 enzymatic reactions, which are chemical processes that use enzymes to speed up vital bodily functions.
Why it's used
It is used to support a wide range of biological processes across the body. Because it is required for so many different chemical reactions, it is a fundamental component for maintaining general health.
How it's made
To create a supplement, magnesium is extracted from natural sources and combined with other molecules to create a stable compound. This resulting powder is then measured and packed into capsules or pressed into tablets for sale.
What it typically costs
Magnesium is generally mid-range in price. This is because the raw mineral is relatively abundant and easy to source, but the cost can vary depending on the complexity of the specific compound being manufactured.
Dosage by purpose
Purpose
Typical studied dose
Evidence
high blood pressure (hypertension)
243 to 973 mg per day
limited
type 2 diabetes
300 to 600 mg elemental magnesium per day
emerging
bone health
300 to 1830 mg per day
emerging
periodontal health
500 mg per day (combined with zinc gluconate)
limited
insomnia
250 to 729 mg of magnesium oxide per day
emerging
Forms compared
Form
What it is
Why chosen
Does it actually differ?
Magnesium Citrate
A salt form of magnesium
It is one of the most studied forms and is consistently absorbed well by the body
Shows good bioavailability compared to other forms
Magnesium Glycinate
A salt form of magnesium
It appears to be absorbed well by the body
Listed as having good bioavailability
Magnesium Oxide
A salt form of magnesium
Not recommended for increasing magnesium levels
Has extremely poor absorption and a higher risk of stomach-related side effects
Verdict: You should seek out Magnesium Citrate or Glycinate over Magnesium Oxide because Oxide is poorly absorbed and more likely to cause stomach issues.
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.
Essential mineral involved in 300+ enzymatic reactions
How does Suppio calculate the best-value Magnesium?
We rank Magnesium by price per 375mg - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Are these prices verified?
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
How often are Magnesium prices updated?
Prices across our retailer network are refreshed at least daily.