Magnesium supplements that may improve sleep: three tested options

Which? tested 26 magnesium supplements for absorption, dosage and additives and highlighted three products: New Leaf Magnesium 4 in 1, Vitabright Magnesium Glycinate, and Nutrition Geeks Mg Glycinate 3-in-1.

Which? reviewed a range of magnesium supplements to see which might help with sleep. Magnesium is described as important for brain health, muscle function and blood-sugar balance, and the NHS recommends around 300 mg daily for men and 270 mg for women. Reviewers bought 26 products and assessed each for bioavailability, measured the magnesium dose per serving, checked for unnecessary additives and sent samples to an independent lab to verify label claims. The aim was to identify products with good absorption, accurate dosing and minimal extras. Key findings: - Which? tested 26 magnesium products and purchased the items rather than relying on free samples. - Testing included assessments of bioavailability, measurements of magnesium per serving, a check for unnecessary additives and independent laboratory verification of label claims. - New Leaf Magnesium 4 in 1: costs about 23p per daily dose (two capsules), provides 381 mg per serving, contains glycinate, citrate, malate and oxide, showed excellent bioavailability and is stocked at Holland & Barrett. - Vitabright Magnesium Glycinate: costs about 21p per daily dose (two capsules), provides 300 mg per serving, uses a single form (glycinate) noted for good absorption; the article also notes dietary sources such as spinach and nuts. - Nutrition Geeks Mg Glycinate 3-in-1: costs about 22p per daily dose (two capsules), provides 384 mg per serving, combines glycinate, malate and citrate, and testers reported strong absorption; this product is available online only. Summary: The review highlights variation in formulation, dose and price among the tested magnesium supplements and reports on differences in absorption and label accuracy. Undetermined at this time.