Best Magnesium Supplement Brands in 2026 — Ranked by Trust Score

Magnesium is one of the most popular supplements — and one where the form matters enormously. We ranked 3382 brands by safety and quality data.

Magnesium Forms: Why It Matters

Not all magnesium is the same. The form determines absorption and effects:

• Magnesium Glycinate — Best absorbed, gentle on stomach. Good for sleep and relaxation.
• Magnesium Citrate — Well-absorbed, may have laxative effect. Good for constipation.
• Magnesium L-Threonate — Crosses blood-brain barrier. Studied for cognitive function.
• Magnesium Oxide — Cheapest, worst absorbed (~4% bioavailability). Avoid unless you need a laxative.
• Magnesium Taurate — Good for heart health. Emerging research.

Budget brands almost always use magnesium oxide. Check the label for the specific form.

Top Magnesium Brands by Trust Score