Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Manufacturer COA
Manufacturer statement
WeightWorld product page says the supplement is "Third-Party Tested" and the page includes a PDF titled "WEIGHTWORLD_MAGNESIUM_GLYCINATE_1422_mg_180_CAPSULES_-_BATCH_CODE_0429825-TCC.pdf". The PDF itself is a "TESTING COMPLIANCE CERTIFICATE" for "WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825" and reports microbiology and contaminant testing plus magnesium/vitamin B6 tolerance checks.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Verified independent evidence
Manufacturer statement
WeightWorld UK product page says “Third-party lab tested — View Certificate”; the certificate for WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825 is a Testing Compliance Certificate attached to test report no. 26C22334 from Neotron Spa, and it states the sample is compliant with contaminant limits and nutrient tolerances.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Compare elemental magnesium, not compound weight. A 1,420 mg bisglycinate compound can supply 200 mg elemental magnesium. The rest is the accompanying compound. Use the declared elemental amount; do not infer it from a generic conversion percentage. Read the dose guide ↓
WeightWorld product page says the supplement is "Third-Party Tested" and the page includes a PDF titled "WEIGHTWORLD_MAGNESIUM_GLYCINATE_1422_mg_180_CAPSULES_-_BATCH_CODE_0429825-TCC.pdf". The PDF itself is a "TESTING COMPLIANCE CERTIFICATE" for "WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825" and reports microbiology and contaminant testing plus magnesium/vitamin B6 tolerance checks.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
WeightWorld UK product page says “Third-party lab tested — View Certificate”; the certificate for WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825 is a Testing Compliance Certificate attached to test report no. 26C22334 from Neotron Spa, and it states the sample is compliant with contaminant limits and nutrient tolerances.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing and Zipvit product page both claim the product is "Third Party Tested" / "Independently Verified for Quality & Safety" and "INDEPENDENTLY LAB TESTED"; Zipvit product page also shows "106% LABEL ACCURACY 4/4 TESTS PASSED 1/1 CLAIMS VERIFIED".
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "Formulated and Tested with Expertise" and "our products undergo rigorous testing for heavy metals and unwanted compounds during production" on the Ingredients & Quality page.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
VitaBright says: "All our supplements undergo rigorous quality testing. We normally have every batch tested by an independent laboratory which issues third-party certification."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "Certified for Quality & Safety — Our products are GMP (Good Manufacturing Practice) certified" and the product page also shows two COA images, but I did not find an independently verifiable third-party registry entry or readable lab report for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production..."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
AAVALABS’ own FAQ and brand article say the company’s products are subjected to “thorough independent third-party laboratories to ensure purity, including checks for heavy metals, GMOs, and gluten,” but I did not find a product-specific COA, lab report, or certifying-body registry entry for Fullnesium Complex.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Time Health product page says "Third Party Test Report" and "Heavy Metal Analysis" for Magnesium L-Threonate - Magtein® - Cognitive & Sleep Support, but I did not locate an independently verifiable lab report or certification page for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Viridian’s own site says the product has "130 purity checks" and the product page says "I Trust Viridian Supplements because I see what goes into them - 130 purity checks, no junk, and formulas rooted in real research"; the brand also says "Our 130 Point Promise" includes a "Purity" checklist and that a reference sample of every batch is kept for its complete shelf life.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: “We publicize our third party test results so you can be confident that you’re stacking with the best.” Amazon listing also says: “THIRD PARTY TESTED – Our capsules are third party tested for purity and potency.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
New Leaf Products’ Ingredients & Quality page says: “To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production …”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Wild Nutrition’s own site says Food-Grown® Magnesium is “Scientifically studied” and that a “gold-standard placebo-controlled sleep study” showed it “increases sleep by 42 minutes per night and sleep quality by 32%”; it also says the product was put through a “double-blind, parallel clinical trial” with the University of Queensland.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
WeightWorld product page says the supplement is "Third-Party Tested" and the page includes a PDF titled "WEIGHTWORLD_MAGNESIUM_GLYCINATE_1422_mg_180_CAPSULES_-_BATCH_CODE_0429825-TCC.pdf". The PDF itself is a "TESTING COMPLIANCE CERTIFICATE" for "WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825" and reports microbiology and contaminant testing plus magnesium/vitamin B6 tolerance checks.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
WeightWorld UK product page says “Third-party lab tested — View Certificate”; the certificate for WEIGHTWORLD MAGNESIUM GLYCINATE 1422 mg 180 CAPSULES - BATCH CODE: 0429825 is a Testing Compliance Certificate attached to test report no. 26C22334 from Neotron Spa, and it states the sample is compliant with contaminant limits and nutrient tolerances.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Amazon listing and Zipvit product page both claim the product is "Third Party Tested" / "Independently Verified for Quality & Safety" and "INDEPENDENTLY LAB TESTED"; Zipvit product page also shows "106% LABEL ACCURACY 4/4 TESTS PASSED 1/1 CLAIMS VERIFIED".
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "Formulated and Tested with Expertise" and "our products undergo rigorous testing for heavy metals and unwanted compounds during production" on the Ingredients & Quality page.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
VitaBright says: "All our supplements undergo rigorous quality testing. We normally have every batch tested by an independent laboratory which issues third-party certification."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "Certified for Quality & Safety — Our products are GMP (Good Manufacturing Practice) certified" and the product page also shows two COA images, but I did not find an independently verifiable third-party registry entry or readable lab report for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: "To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production..."
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
AAVALABS’ own FAQ and brand article say the company’s products are subjected to “thorough independent third-party laboratories to ensure purity, including checks for heavy metals, GMOs, and gluten,” but I did not find a product-specific COA, lab report, or certifying-body registry entry for Fullnesium Complex.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Time Health product page says "Third Party Test Report" and "Heavy Metal Analysis" for Magnesium L-Threonate - Magtein® - Cognitive & Sleep Support, but I did not locate an independently verifiable lab report or certification page for this specific product.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Viridian’s own site says the product has "130 purity checks" and the product page says "I Trust Viridian Supplements because I see what goes into them - 130 purity checks, no junk, and formulas rooted in real research"; the brand also says "Our 130 Point Promise" includes a "Purity" checklist and that a reference sample of every batch is kept for its complete shelf life.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Manufacturer site says: “We publicize our third party test results so you can be confident that you’re stacking with the best.” Amazon listing also says: “THIRD PARTY TESTED – Our capsules are third party tested for purity and potency.”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
New Leaf Products’ Ingredients & Quality page says: “To ensure the highest safety and quality, our products undergo rigorous testing for heavy metals and unwanted compounds during production …”
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Wild Nutrition’s own site says Food-Grown® Magnesium is “Scientifically studied” and that a “gold-standard placebo-controlled sleep study” showed it “increases sleep by 42 minutes per night and sleep quality by 32%”; it also says the product was put through a “double-blind, parallel clinical trial” with the University of Queensland.
One-time purchase prices; delivery and conditional discounts excluded. Daily cost uses the recorded label serving. Comparison amounts are not personal dose recommendations. Unknown Prime eligibility is not treated as confirmed.
Magnesium forms explained
The form used affects both the elemental percentage and how well it's absorbed - a higher headline mg figure does not automatically mean more usable magnesium. Capsule, tablet and powder are just delivery formats - use the Format filter above to narrow by those; the form itself is what determines elemental content and absorption.
Oxide
Inorganic magnesium compound
Compare
Declared elemental magnesium
Evidence context
Small studies find lower absorption than several soluble salts
Compound mass and elemental magnesium are different. An absorption result does not establish how well this product treats a symptom.
Citrate
Magnesium associated with citrate
Compare
Elemental amount and full serving
Evidence context
A soluble form discussed in comparative absorption research
Check whether citrate is used alone or blended with oxide. A supplement is different from a magnesium-citrate laxative medicine.
Bisglycinate (Glycinate)
Magnesium associated with glycine
Compare
Actual ingredients, including any oxide
Evidence context
The name alone does not prove better sleep or tolerance
A clear total does not reveal how much magnesium each salt contributes in a blend. See the sleep evidence below for the specific preparations studied.
Malate
Magnesium associated with malate
Compare
Declared elemental amount
Evidence context
Muscle and energy marketing is not a clinical result
Compare the actual formula and dose. Do not assume that a named salt establishes superior symptom relief.
L-Threonate
Magnesium associated with threonate
Compare
Elemental amount as well as compound mass
Branded source
Magtein where disclosed
A branded ingredient and its research are separate from verified testing of the finished product.
Taurate
Magnesium associated with taurine
Compare
Elemental magnesium and other ingredients
Evidence context
A cardiovascular claim needs outcome-specific evidence
Often appears in blends; do not infer the contribution of each form from the total.
Hydroxide
Inorganic magnesium compound
Compare
Elemental amount and intended use
Medicine distinction
Also used in laxative and antacid preparations
Follow the specific product instructions. A medicine regimen is not a general nutritional supplement target.
Magnesium dosage: read the elemental amount
Compound weight versus elemental magnesium
The WeightWorld listing declares 1,420 mg of compound supplying 200 mg elemental magnesium in two capsules. Lindens headlines 500 mg magnesium oxide but declares 300 mg elemental. These are recorded label amounts, not independent measurements. Use the product analyses linked in the comparison to inspect each source.
Daily cost and the value calculation
Measure
Calculation
Use it to compare
Price per day
Pack price ÷ recorded daily servings
The cost of following the stated comparison serving.
Price per 100 mg elemental
Pack price ÷ total declared elemental mg in pack × 100
Used in the value score; the comparison table displays daily cost.
The 100 mg unit is arithmetic, not a recommended dose. A blend with undisclosed contributions retains its total elemental figure but carries a review note; we do not invent the share from each salt.
UK intake context
The NHS gives total daily needs of 300 mg for men and 270 mg for women aged 19–64, usually obtainable from a varied diet. These include food, not extra supplement targets. NHS magnesium guidance.
Magnesium glycinate vs citrate, oxide and threonate
Absorption evidence and symptom relief are different questions.
Oxide
Separate compound mass from elemental magnesium.
Small studies generally find lower absorption than several soluble salts.
L-threonate / Magtein
Read the elemental quantity as well as the larger compound number.
A branded-source claim is separate from verified testing.
Multi-form blends
Check if the amount supplied by each salt is disclosed.
A clear total does not identify each component’s contribution.
NIH ODS reviews comparative absorption. It does not establish a universal best form for every person or goal. Our scores evaluate the disclosed record and value; they do not rank absorption or treatment outcomes.
Magnesium benefits: sleep, cramps and anxiety
Evidence by goal
Goal
Evidence strength
What was assessed
Typical study context
Main limitation
Sleep
Modest signals; uncertainty remains
Different salts, including bisglycinate
Small older trials plus a four-week 2025 trial
Short follow-up and subjective outcomes; no universal best form
Common muscle cramps in older adults
Meaningful prevention benefit unlikely
Various preparations
Cochrane review
Pregnancy evidence differs; exercise cramps were not supported by eligible trials
Anxiety
Suggestive, not conclusive
Some combinations with other ingredients
Heterogeneous intervention studies
Cannot isolate magnesium in combination trials
Read the full evidence-by-goal detail
Sleep: include the newer trials
A 2021 review in older adults found low or very low quality evidence from three trials. A 2025 bisglycinate trial subsequently reported a small improvement in self-reported insomnia severity after four weeks using 250 mg elemental magnesium daily. Short duration and subjective outcomes limit certainty; this does not show superiority over citrate or verify a product in this table.
Leg and muscle cramps
The Cochrane review found a meaningful preventive benefit unlikely for common cramps in older adults. Pregnancy findings were inconsistent; the review did not provide eligible trial evidence for exercise-associated cramps.
Anxiety
A 2024 systematic review found promising results in some studies, but small samples, mixed populations and other active ingredients limited interpretation. These findings do not establish magnesium as an anxiety treatment.
When to take magnesium: morning or before bed?
No timing comparison here establishes a universal morning-versus-evening winner. The 2025 bisglycinate trial used 30–60 minutes before bed, but did not compare that schedule with morning use. Treat the schedule as study context, not proof of an optimal bedtime window.
Check the label and any medicine-spacing instructions below. Keep the stated elemental amount and full serving in view; a bedtime product name is not evidence of a sleep benefit.
Magnesium side effects and safe-dose context
Who should be cautious?If any of the following apply to you, speak to a healthcare professional before taking Magnesium - see the full detail below for why.
Kidney disease or impaired kidney function
Medicines that interact with magnesium
Multiple supplements, antacids or laxatives supplying magnesium
A label serving above the NHS supplemental-dose context
Supplemental doses above 400 mg can cause diarrhoea; the NHS says 400 mg or less is unlikely to cause harm for most people, with uncertainty about long-term high doses. This is general context, not a target. NHS guidance.
Kidney impairment increases toxicity risk. NIH ODS safety review. High-dose entries are flagged and excluded from our top-pick selection.
Magnesium interactions, vitamin D and zinc
Magnesium can interfere with absorption of some antibiotics and bisphosphonates. Diuretics and proton-pump inhibitors can affect magnesium status. Check spacing and suitability with a pharmacist using the specific medicine instructions. NIH interaction guidance.
For products containing vitamin D or zinc, compare each declared amount separately. Check overlapping ingredients and costs across your products; A combination label is not evidence that everyone needs all its ingredients.
Who might consider it?
Consider whether the goal is filling a dietary gap, following advice after a clinical assessment, or trying to address a symptom. These are different decisions. Review food sources and the amount already supplied by other products first. The comparison is designed to make label differences visible; it cannot choose a dose or diagnose the cause of fatigue, cramps or poor sleep.
How we assess magnesium quality
Testing review pending means the product evidence review is unfinished; it is not a failed test or a finding that no report exists. Open the Testing status for the current record and its sources.
A useful review checks the finished product, laboratory, batch, identity and elemental-magnesium results, relevant contaminants and any certification scope. Manufacturer claims and raw-material documents are not automatically independent evidence for the bottle.
Pending testing is excluded from provisional scores. The other components assess documented formulation, dose and label clarity, manufacturer information and value. The existing value calculation compares cost per 100 mg elemental magnesium; the table shows daily cost and daily dose for simpler comparison. Prime and commission contribute no points. Read the scoring method.
Magnesium deficiency and blood testing
Fatigue, weakness and cramps can occur with magnesium deficiency but do not diagnose it. Serum magnesium is commonly measured, yet does not fully reflect total stores. Interpret results alongside diet, medicines and kidney function with a clinician. NIH deficiency and assessment guidance.
Testing evidence in this comparison
A testing claim is not the same as a verified report. No public evidence located does not mean a product has not been tested.
Testing review pending0
Recognised certification0
Verified independent evidence1
Manufacturer COA1
Testing claimed11
No public evidence located9
What does magnesium cost?
Current UK comparison set, based on the daily serving shown on each label.
£0.07Lowest daily cost
£0.17Median daily cost
£1.30Highest daily cost
Your questions, answered
What is the difference between magnesium glycinate and citrate?
They are different magnesium salts. Compare the declared elemental dose, ingredients and cost in the form guide, which separates absorption evidence from claims about symptoms.
Which magnesium is best for sleep?
The available studies do not establish one form as best. The sleep evidence summary includes both the older review and the small benefit reported in a newer bisglycinate trial.
One recent trial used 30–60 minutes, but did not compare different times. That does not establish an ideal schedule. See the timing section and trial source.
Does magnesium help leg cramps?
For common cramps in older adults, the Cochrane review did not find a meaningful preventive benefit likely. See the cramp evidence and population limits.
Can I take magnesium with vitamin D or zinc?
Check each ingredient’s amount and duplicates across products. The combination and interaction guide explains what to review; an added ingredient is not an automatic benefit.
What happens if I take too much magnesium?
Diarrhoea can occur at high supplemental doses, and kidney impairment changes the risk. Read the safety panel and NHS/NIH sources before choosing a serving.
