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Independent comparisons built from product labels and dated retailer-offer snapshots.

Published by Paolo Tozzo · Business no. 181336668 · Varna, Bulgaria

United States · USD

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This site compares product information, not personal health needs. Read our methodology and important information.
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Catalog/Magnesium/Comparison
Same market · same category

Magnesium 250 mg, 250 Tablets vs Extra-Strength Magnesium Glycinate Powder 500 mg — Unflavored

Choose different products
The short version

At a glance

Value
Magnesium 250 mg, 250 TabletsLower cost per 100 mg elemental magnesium
Active dose
Extra-Strength Magnesium Glycinate Powder 500 mg — UnflavoredHigher declared elemental magnesium per label serving
Label-day units
Not awardedFewer counted tablets, capsules, softgels, or gummies across the label-directed day
  • The products declare different Magnesium form; this difference does not establish superiority.
Side by side

Declared facts and derived metrics

Cost bands use USD. Product pages show exact listed prices with their verification dates.

Magnesium 250 mg, 250 Tablets and Extra-Strength Magnesium Glycinate Powder 500 mg — Unflavored comparison
FactMagnesium 250 mg, 250 Tablets ↗ at iHerb (opens in a new tab)21st CenturyExtra-Strength Magnesium Glycinate Powder 500 mg — Unflavored ↗ at The Vitamin Shoppe (opens in a new tab)Solaray
Magnesium details
Elemental magnesium250 mgLeads500 mg
Magnesium formMagnesium oxideMagnesium bisglycinate
Cost / 100 mgLeads$0.01$0.22
Counted units / label day1Not declared
Shared facts
Brand21st CenturySolaray
Label serving size1 tablet1 Scoop (7.96 Grams)
Servings per container25030
Delivery formTabletPowder
AvailabilityIn stockIn stock
Selected retaileriHerbThe Vitamin Shoppe
Product last verifiedJul 17, 2026Jul 19, 2026
Tax includedTax inclusion not confirmedTax inclusion not confirmed
Shipping includedShipping excluded from comparisonShipping excluded from comparison
How to read this comparison
  1. Compare elemental magnesium per serving—not compound weight.
  2. Note the declared form and counted units across the label-directed day.
  3. Use cost per 100 mg—not product-specific daily cost—to compare value.

Calculated values use the published category formulas. They do not change when the page language changes.

What these numbers do not establish

Differences in listed price, declared amount, chemical form, or counted label-day units do not establish safety, effectiveness, bioavailability, tolerance, or personal suitability. Verify the current label and discuss individual health decisions with a qualified healthcare professional.

Attribution and freshness

Sources and freshness

Check the dated manufacturer, label, and retailer records behind the displayed facts and prices.

Magnesium 250 mg, 250 Tablets

Label facts last verified Jul 17, 2026.

  • Manufacturer product source
  • 21st Century · label Jul 17, 2026
  • iHerb · offer:us:iHerb Jul 17, 2026
  • iHerb price source Jul 17, 2026
  • View the complete product source record

Extra-Strength Magnesium Glycinate Powder 500 mg — Unflavored

Label facts last verified Jul 19, 2026.

  • Manufacturer product source
  • Solaray · label Jul 19, 2026
  • The Vitamin Shoppe · offer:us:The Vitamin Shoppe Jul 19, 2026
  • The Vitamin Shoppe price source Jul 19, 2026
  • View the complete product source record

Ready to check a retailer?

View Magnesium 250 mg, 250 Tablets ↗View Extra-Strength Magnesium Glycinate Powder 500 mg — Unflavored ↗