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Different forms serve different purposes. We break down bioavailability and clinical backing.
NSF Certified for Sport chelated magnesium with excellent bioavailability. Thorne's bisglycinate delivers 200mg elemental magnesium per serving in a form that's gentle on the stomach, backed by strong absorption data, and produced under pharmaceutical-grade manufacturing standards.
The only magnesium form shown to cross the blood-brain barrier effectively. Strong evidence for cognitive function and sleep. Premium pricing reflects patented form.
The workhorse of magnesium supplements. Glycinate form is well-absorbed, gentle on the stomach, and NOW delivers it at an unbeatable price. No glamour, just function.
Magnesium glycinate/lysinate chelate with excellent absorption. 200mg elemental magnesium per serving at a budget-friendly price. Albion Minerals chelate is a respected source.
Three forms of magnesium (citrate, oxide, succinate) in one capsule for broad coverage. 500mg elemental magnesium at $0.12/serving. Life Extension's research-focused approach delivers value.
The only magnesium form demonstrated to cross the blood-brain barrier and elevate brain magnesium levels. Promising for cognitive function, but the evidence is still early-stage and it is expensive for the elemental magnesium you actually get.
The cheapest option, but you get what you pay for. Magnesium oxide has the worst bioavailability of any common form -- only 4% is absorbed. The 400mg label dose is misleading.
The gummy format is appealing but delivers only 83mg magnesium citrate per serving -- well below therapeutic doses. You would need 5 servings to match a single capsule of NOW Glycinate. Form over function.