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Trying to find the best magnesium supplement? ConsumerLab tested popular forms and brands. Find out which ones passed our review and tests, which failed, and which we selected as our Top Picks. Learn which forms of magnesium are best absorbed, correct dosage, side effects, and who is most likely to need magnesium.
Information about magnesium including independent product reviews and comparisons, warnings, recalls, side effects, clinical use updates, and news.
ConsumerLab purchased and tested 15 popular magnesium supplements, including softgels, capsules, tablets, liquids, and gummies, to help identify the best magnesium supplements, and selected its Top Pick. Magnesium supplement brands tested include Bluebonnet, BulkSupplements, Doctor’s Best, Garden of Life, GNC, Natural Vitality, NOW, Pure Encapsulations, and others.
Find out how much magnesium you should be getting on a daily basis, signs of magnesium deficiency, and how much magnesium is too much, particularly from magnesium supplements and laxatives containing magnesium. Find out the side effects and potential adverse effects of too much magnesium.
Answer: The most common side effects of magnesium supplements are stomach upset, nausea, vomiting and diarrhea (as nearly all forms of magnesium have a laxative effect). Magnesium hydroxide (milk of magnesia) and magnesium citrate, for example, are commonly found in over-the-counter products to treat constipation.
Answer: Magnesium L-threonate is composed of magnesium bound to threonic acid (EFSA Panel, EFSA J 2024). Compared to other forms of magnesium, magnesium L-threonate contains a relatively small amount of elemental magnesium (only 8% compared to 11% to 60% for other forms of magnesium). However, it is of clinical interest due to an apparently unique ability to cross the blood-brain barrier and ...