By Erin Rose · Updated June 25, 2026 · Methodology · About Us Start from a symptom and we connect it to the supplement, form, and dose the evidence actually supports — or tell you when it does not. The 2pm Crash: Why You Hit a Wall Every Afternoon (2026) The afternoon crash isn't blood sugar alone. Iron, B vitamin, magnesium, CoQ10 deficiencies cause energy drops after lunch. What to test, take, and what works. The 2pm Crash: Why You Hit a Wall Every Afternoon (2026) The afternoon crash isn't blood sugar alone. Iron, B vitamin, magnesium, CoQ10 deficiencies cause energy drops after lunch. What to test, take, and what works. Always Tired? The Two Deficiencies Your Doctor Should Test For Persistent fatigue that won't go away is often caused by vitamin D deficiency (42% of adults) or magnesium deficiency (50% of adults). Both are testable. Always Tired? The Two Deficiencies Your Doctor Should Test For Persistent fatigue that won't go away is often caused by vitamin D deficiency (42% of adults) or magnesium deficiency (50% of adults). Both are testable. Anxiety That Won't Go Away? Supplements That Actually Have Evidence If anxiety persists despite lifestyle changes, certain supplements have trial evidence. Magnesium glycinate cut anxiety scores 4.5 points (P<0.001) in an RCT. Anxiety That Won't Go Away? Supplements That Actually Have Evidence If anxiety persists despite lifestyle changes, certain supplements have trial evidence. Magnesium glycinate cut anxiety scores 4.5 points (P<0.001) in an RCT. Brain Fog: The Nutrient Deficiencies Behind Mental Cloudiness (2026) Brain fog - trouble thinking clearly, poor concentration, mental haze - is often caused by deficiencies in B12, iron, vitamin D, or magnesium. What to take. Brain Fog: The Nutrient Deficiencies Behind Mental Cloudiness (2026) Brain fog - trouble thinking clearly, poor concentration, mental haze - is often caused by deficiencies in B12, iron, vitamin D, or magnesium. What to take. Can't Sleep? The Supplement That Actually Has Clinical Evidence If you can't fall asleep or stay asleep, magnesium glycinate is the supplement with the strongest evidence. Meta-analysis shows 17-minute faster sleep onset. Can't Sleep? The Supplement That Actually Has Clinical Evidence If you can't fall asleep or stay asleep, magnesium glycinate is the supplement with the strongest evidence. Meta-analysis shows 17-minute faster sleep onset. Your Doctor Said Take Magnesium — Here's Exactly Which One to Buy Doctor recommended magnesium but didn't say which product? Here's a simple guide: which form, what dose, and the best products ranked by cost and quality. Your Doctor Said Take Magnesium — Here's Exactly Which One to Buy Doctor recommended magnesium but didn't say which product? Here's a simple guide: which form, what dose, and the best products ranked by cost and quality. Eye Twitching That Won't Stop? What Your Body Might Be Telling You Persistent eye twitching (myokymia) is often caused by magnesium deficiency, stress, or poor sleep. What actually helps, including which supplements work. Eye Twitching That Won't Stop? What Your Body Might Be Telling You Persistent eye twitching (myokymia) is often caused by magnesium deficiency, stress, or poor sleep. What actually helps, including which supplements work. Feeling Depressed? Nutrient Deficiencies That Mimic Depression (2026) Low mood, no motivation, and emotional flatness can be caused by deficiencies in vitamin D, folate, B12, omega-3, zinc, and magnesium. Testable and fixable. Feeling Depressed? Nutrient Deficiencies That Mimic Depression (2026) Low mood, no motivation, and emotional flatness can be caused by deficiencies in vitamin D, folate, B12, omega-3, zinc, and magnesium. Testable and fixable. Hair Loss on Ozempic, Wegovy & Mounjaro: What Actually Helps (2026) 25-33% of GLP-1 users experience hair thinning. It's telogen effluvium from rapid weight loss — not permanent. Here's exactly what to take, based on clinical evidence. Hair Loss on Ozempic, Wegovy & Mounjaro: What Actually Helps (2026) 25-33% of GLP-1 users experience hair thinning. It's telogen effluvium from rapid weight loss — not permanent. Here's exactly what to take, based on clinical evidence. Hair Falling Out? Nutrient Deficiencies That Cause Hair Loss (2026) Hair loss in women is most commonly caused by iron deficiency (ferritin <30), vitamin D deficiency, or zinc deficiency - not genetics. Here's what to test.

Hair Falling Out? Nutrient Deficiencies That Cause Hair Loss (2026) Hair loss in women is most commonly caused by iron deficiency (ferritin <30), vitamin D deficiency, or zinc deficiency - not genetics. Here's what to test. Heart Palpitations: Mineral Deficiency, Not a Heart Problem (2026) Heart palpitations and skipped beats are often caused by magnesium and potassium deficiency, not heart disease. 5 of 14 women on low magnesium had arrhythmias. Heart Palpitations: Mineral Deficiency, Not a Heart Problem (2026) Heart palpitations and skipped beats are often caused by magnesium and potassium deficiency, not heart disease. 5 of 14 women on low magnesium had arrhythmias. Heavy Periods & Iron Deficiency: A Cycle That Keeps Worsening (2026) Heavy periods deplete iron every month, causing fatigue, brain fog, and hair loss that worsens each cycle. Break the loop with iron, vitamin C, and folate. Heavy Periods & Iron Deficiency: A Cycle That Keeps Worsening (2026) Heavy periods deplete iron every month, causing fatigue, brain fog, and hair loss that worsens each cycle. Break the loop with iron, vitamin C, and folate. Leg Cramps at Night Every Night? Here's What Actually Helps Nocturnal leg cramps keeping you awake? Evidence-based review of causes and treatments, including the one supplement with RCT evidence for reducing nighttime cramp frequency. Leg Cramps at Night Every Night? Here's What Actually Helps Nocturnal leg cramps keeping you awake? Evidence-based review of causes and treatments, including the one supplement with RCT evidence for reducing nighttime cramp frequency. Restless Legs at Night: The Iron and Magnesium Connection (2026) Restless leg syndrome is strongly linked to iron deficiency - even when ferritin is "normal." Ferritin below 75 mcg/L worsens RLS. What to ask your doctor. Restless Legs at Night: The Iron and Magnesium Connection (2026) Restless leg syndrome is strongly linked to iron deficiency - even when ferritin is "normal." Ferritin below 75 mcg/L worsens RLS. What to ask your doctor. Tingling in Hands & Feet: The B12 Warning Sign You Shouldn't Ignore Tingling, numbness, or pins and needles in your hands and feet is the hallmark of B12 deficiency, and can start at 'normal' blood levels. When it's reversible. Tingling in Hands & Feet: The B12 Warning Sign You Shouldn't Ignore Tingling, numbness, or pins and needles in your hands and feet is the hallmark of B12 deficiency, and can start at 'normal' blood levels. When it's reversible. Compare Magnesium Glycinate Products by Cost Per Day Magnesium deficiency is the most common thread across the symptom pages above — here's how the glycinate products we track compare on cost per day. The evidence · Magnesium Glycinate What the published reviews of Magnesium Glycinate concluded Effects of magnesium and potassium supplementation on insomnia and sleep hormones in patients with diabetes mellitus. · Frontiers in endocrinology , 2024 “The study revealed that magnesium, potassium, and magnesium and potassium combined had a significant effect on serum cortisol and melatonin levels (sleep hormones). In addition, supplementation significantly decreased the severity of insomnia among patients with diabetes by improving sleep duration.” “The study revealed that magnesium, potassium, and magnesium and potassium combined had a significant effect on serum cortisol and melatonin levels (sleep hormones). In addition, supplementation significantly decreased the severity of insomnia among patients with diabetes by improving sleep duration.” The effect of vitamin D and magnesium supplementation on the mental health status of attention-deficit hyperactive children: a randomized controlled trial. · BMC pediatrics , 2021 “Vitamin D (50,000&#x2009;IU/week) and magnesium (6&#x2009;mg/kg/day) co-supplementation for a duration of 8-weeks could improve the behavioral function and mental health of children with ADHD. However, further well-designed studies with a larger sample size are needed.” “Vitamin D (50,000&#x2009;IU/week) and magnesium (6&#x2009;mg/kg/day) co-supplementation for a duration of 8-weeks could improve the behavioral function and mental health of children with ADHD. However, further well-designed studies with a larger sample size are needed.” Bone and vascular effects of magnesium supplements in CKD patients (the MagicalBone Pilot Study). · Nefrologia , 2024 “In sum, these results suggest a possible beneficial effect of Mg on vascular compliance with no detrimental effects on bone status. In addition, our results highlight the need to consider monitorization of urinary Mg status in CKD patients.” “In sum, these results suggest a possible beneficial effect of Mg on vascular compliance with no detrimental effects on bone status. In addition, our results highlight the need to consider monitorization of urinary Mg status in CKD patients.” Positive effects of magnesium supplementation in metabolic syndrome. · International journal of clinical pharmacology and therapeutics , 2024 “Using supplementation with 400 mg magnesium for 12 weeks in patients with metabolic syndrome, ionized magnesium concentrations significantly increased, while serum magnesium did not change significantly.” “Using supplementation with 400 mg magnesium for 12 weeks in patients with metabolic syndrome, ionized magnesium concentrations significantly increased, while serum magnesium did not change significantly.” Method: PubMed searched in humans for randomised trials with Magnesium Glycinate in the title; these 4 of the 31 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Magnesium Glycinate will work for you — each of these reports an average across trials published 2021–2024, and null findings are shown here as readily as positive ones. Every comparison uses clinical evidence from PubMed systematic reviews, product label data from the NIH Dietary Supplement Label Database , and third-party certifications ( USP , NSF ). Products are ranked by cost per clinically-effective dose. See our methodology and editorial standards .