Compare every Magnesium Citrate product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Highly bioavailable magnesium form with mild laxative properties
We rank Magnesium Citrate by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Magnesium Citrate is a type of magnesium salt. It is created by combining magnesium with citric acid, which makes it highly bioavailable, meaning the body can absorb it into the bloodstream more easily than some other forms.
This ingredient is primarily used to increase magnesium levels in the body. Because it has mild laxative properties, it is often used to help relieve constipation by drawing water into the intestines.
To make this supplement, manufacturers combine magnesium oxide or magnesium carbonate with citric acid in a controlled liquid solution. This mixture is then filtered and dried into a fine powder, which is then put into capsules or pressed into tablets.
This supplement is generally mid-range in price. This is because the process of bonding magnesium to citric acid is more complex than producing basic magnesium oxide, but the raw materials remain relatively common and easy to source.
| Purpose | Typical studied dose | Evidence |
|---|---|---|
| bone turnover and bone mineral density in postmenopausal osteoporotic women | 1,830 mg | emerging |
| sleep quality | 320 mg | limited |
| Form | What it is | Why chosen | Does it actually differ? |
|---|---|---|---|
| Magnesium Citrate | A salt form of magnesium that is widely studied. | It is chosen for its good bioavailability, meaning the body can absorb it easily. | Consistently shows good bioavailability compared to other forms. |
| Magnesium Glycinate | A salt form of magnesium. | It is used because it appears to have good bioavailability. | Listed as having good bioavailability, similar to magnesium citrate. |
| Magnesium Oxide | A salt form of magnesium. | Not recommended for increasing magnesium levels due to poor performance. | Has extremely poor absorption and a higher risk of causing stomach-related side effects. |
Verdict: Avoid magnesium oxide due to poor absorption and side effects, and instead choose magnesium citrate or glycinate for better absorption.
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.
Highly bioavailable magnesium form with mild laxative properties
We rank Magnesium Citrate by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
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.