Minerals
6 evidence-based guides on minerals — backed by clinical research and scored in our catalog.
Magnesium Glycinate vs Citrate vs Oxide: Which Form Actually Absorbs?
Glycinate (80% absorbed) vs citrate (50%) vs oxide (4%) — with elemental-dose math, side effects, and picks for sleep, constipation, and cognition.
Best Magnesium Supplements 2026, Ranked by Clinical Evidence
Learn which magnesium form actually matches your goal — glycinate, threonate, citrate and more — and see the top-scored magnesium products in our catalog.
8 Signs of Magnesium Deficiency – 2026 Guide
Muscle cramps, twitching eyelids, and poor sleep may signal low magnesium. Learn all 8 signs, why standard blood tests miss it, and how to fix it.
Zinc Supplement Guide 2026: Evidence-Based & Ranked
Learn which zinc forms actually shorten colds, how dosing affects testosterone and copper balance, and who faces the highest deficiency risk.
Iron Supplements Guide 2026: Evidence-Based & Ranked
Learn who needs iron supplements, what bloodwork to get, and which forms won’t wreck your stomach. Covers dosing science most doctors skip.
Best Food Sources of Magnesium
Roughly half of adults fall short on magnesium. The top whole-food sources - leafy greens, nuts, seeds, legumes, dark chocolate - plus how much you need and when a supplement helps.