Retailer region: Some links in this guide open Amazon.com (U.S.), as checked on 16 September 2026. A U.S. listing does not confirm Canadian delivery, Canadian-dollar pricing or the same local model. Check the destination, currency, delivery and return terms before ordering.
Magnesium labels can differ in chemical form, elemental amount, serving units and added ingredients. This research-based shopping guide compares those decisions across five existing listings. It does not diagnose a deficiency, prescribe a dose or claim that we tested the products.
Affiliate disclosure: DealScanOn may earn from qualifying purchases through the retailer links. Manufacturer references below identify specific labels; they do not establish that every linked marketplace variant is identical.
The label differences that matter
| Product family | Main comparison task | Listing |
|---|---|---|
| Webber Naturals Magnesium 250 mg | The identified ASIN is the 250 mg caplet blend, not the 200 mg bisglycinate reference. | Check exact label (U.S. retailer) |
| Jamieson calcium–magnesium–vitamin D listing | The redirect indicates added calcium and vitamin D; current retailer pack remains unverified. | Check exact label (U.S. retailer) |
| Natural Factors Magnesium Citrate | Match citrate form, amount per unit, capsule count and regional label. | Check exact label (U.S. retailer) |
| NOW Foods Magnesium Citrate | Distinguish tablets, capsules and powder; serving sizes may differ. | Check exact label (U.S. retailer) |
| Nature’s Bounty Magnesium | Require the exact formulation and format before comparing value. | Check exact label (U.S. retailer) |
1. Webber Naturals Magnesium 250 mg
The retained short link resolves to ASIN B08WV4HT6J. A retailer record for that ASIN identifies Webber Naturals Magnesium 250 mg caplets, not Magnesium Bisglycinate 200 mg. The 250 mg manufacturer label lists oxide, malate and glycerophosphate. The separate 200 mg bisglycinate reference describes a different formula. Check the actual regional pack before ordering; the final U.S. seller page remains unavailable in this audit.
View retailer details (U.S. retailer)
2. Jamieson calcium–magnesium–vitamin D listing
The retained link’s redirect identifies a calcium–magnesium–vitamin D combination at ASIN B08WRMHN3R, while the earlier paragraph described a magnesium-only 250 mg product. Those are not interchangeable. Jamieson’s combination-product label confirms that this product family contains added calcium and vitamin D. The final retailer page could not be fully retrieved, so its current pack and label remain unverified. Do not use the previous magnesium-only amount to compare this offer.
View retailer details (U.S. retailer)
3. Natural Factors Magnesium Citrate
Use the complete Canadian label to confirm the specific citrate product. A product family name does not establish the amount in each capsule or the number needed for the labelled serving. If the listing only shows the front of the bottle, obtain the back label before comparing it with the other options. We are not assigning a stomach-tolerance or best-citrate score without comparative evidence.
View retailer details (U.S. retailer)
4. NOW Foods Magnesium Citrate
A large container can look inexpensive while using a different serving size. Compare the label’s amount and serving units first, then calculate cost for the prescribed or labelled use. Do not assume a NOW tablet, capsule and powder are interchangeable because the ingredient family is the same. Check the seller’s region, full ingredient panel and package count.
View retailer details (U.S. retailer)
5. Nature’s Bounty Magnesium
Treat the exact label as the starting point. Confirm the magnesium form and whether the item is a tablet, softgel or another format; the previous article’s broad format description was not a verified specification for one SKU. A low bottle price is not enough to award a budget winner without comparing equivalent units and checkout costs.
View retailer details (U.S. retailer)
Compare an equivalent quantity, not the biggest number
Write down four fields for each option: elemental magnesium amount, number of tablets or capsules per labelled serving, total units in the container, and complete checkout cost. Keep a separate column for other active ingredients. A product that combines magnesium with melatonin or vitamin D answers a different question from magnesium alone.
Illustrative shopping arithmetic: bottle A costs C$18 for 90 capsules and uses two capsules per labelled serving, so it contains 45 servings at C$0.40 each. Bottle B costs C$24 for 120 capsules and uses one per labelled serving, so it contains 120 at C$0.20 each. Those prices are examples, not offers, and the products are only comparable after their amounts and intended use match. Do not increase a dose to make a value calculation look better.
What the health evidence does—and does not—establish
NIH explains that magnesium supports normal body functions, but supplements can cause diarrhoea and other adverse effects, and can interact with medicines. The risk from excessive intake is greater when kidney function is impaired. A supplement’s role in normal muscle function does not establish that this particular product treats sleep problems, cramps or post-workout soreness. See the NIH magnesium fact sheet.
Ask a pharmacist or clinician to check suitability and interactions if you take medicines, have a medical condition, are pregnant or breastfeeding, or are shopping for a child. Use the actual label and professional advice; this comparison supplies no personal dosing instruction.
When to skip a listing
- The complete ingredient panel or serving information is missing.
- The seller’s photos and written description show different strengths.
- A health promise is the only reason given to choose it.
- The seal, expiry information or seller identity is unclear.
Frequently asked questions
Does bisglycinate always mean oxide-free? No. The separate Webber 200 mg reference is buffered, while the retained retailer ASIN identifies a different 250 mg blend. Inspect the complete ingredient declaration.
Does citrate automatically mean better value? No. Value depends on the actual label, usable quantity and total cost.
Which is the overall winner? We are not naming one without an equivalent-dose, exact-product comparison. First establish whether supplementation is appropriate; then compare the specific labels.