$30.95 per container, before delivery
$1.43 per 200mg elemental magnesium, before delivery
Free delivery
Price checked Oct 16, 2026.
Buy at Double Wood Supplements (direct) →Label, prices & sources →Sports Research MAG LT Magnesium L-Threonate with Magtein (90 veggie capsules)
D · None located
Label read Sep 20, 2026. Where the data comes from
Is Sports Research third party tested? · Which magnesium brands are third-party tested?
Cost
$1.39
per 200mg elemental magnesium
$29.95
per container · Sports Research (direct)
$41.60
a month at one dose a day
Amount per serving
144mg elemental magnesium
Upper intake level
Adults, 350mg a day, from supplements and medications; magnesium in food does not count toward it. One serving of this product holds 144mg, less than that level on its own.
An upper intake level is the largest daily intake unlikely to cause harm for most people. It is not a limit on treatment. Higher amounts are sometimes used, but only under the direction and supervision of a health care provider. It is not a recommendation about what to take.
Source: NIH Office of Dietary Supplements, Magnesium fact sheet for health professionals: the upper intake level, read October 8, 2026 · checked Oct 8, 2026
Definition: NIH Office of Dietary Supplements, Dictionary of dietary supplement terms: what an upper intake level is, read October 8, 2026 · checked Oct 8, 2026
Servings per container
30
Units needed per dose
4.17 capsules
Doses per container
21.6
Cost per serving
$0.998
In whole units
5 capsules = 240mg for $1.66
This is the smallest whole number of capsules that holds at least one comparison dose. It is shown as a caveat and is deliberately not used in ranking, because rounding up changes the amount as well as the price.
- One comparison dose is 4.17 capsules, and capsules cannot be split. The smallest whole number that holds at least the 200 mg comparison dose is 5 capsules, which hold 240 mg.
- Elemental magnesium as printed on this package's own Supplement Facts panel ("Servings Per Container: 30"): "Magnesium 144 mg 34% (from 2000 mg magnesium L-threonate) (Magtein®)" per 3-capsule serving. The panel prints both figures, so the elemental amount is read and the 2000 mg compound weight is recorded beside it; neither is calculated from the other. The panel names one salt and no second salt.
Delivery
Delivery cost
$7.50
Below the $50.00 free-delivery threshold; $20.05 more would make delivery free.
Cost per dose delivered
$1.73
To get free delivery
Spend $20.05 more at Sports Research (direct)
Delivery policy: Sports Research, Sports Research Shipping page · checked Sep 19, 2026
Buying more than one? Calculate the order
Change the quantity to see the actual container subtotal and whether it reaches the recorded free-delivery threshold.
- Container subtotal
- $29.95
- Delivery
- $7.50
- Order total, before tax
- $37.45
- Per 200mg elemental magnesium, delivery included
- $1.73
30 labeled servings in this order. Comparison doses are a price yardstick, not advice about how much to take.
Unit price checked Oct 12, 2026.
View this package at Sports Research (direct) →Set the quantity at the retailer; this calculator does not add items to a cart. Uses the recorded unit price with no coupon or quantity discount. Tax is extra. Delivery terms apply to the contiguous US unless the policy says otherwise.
Delivery terms and limits
Free shipping on orders with subtotals of $50 or more, before tax and after discounts; below that a published $7.50 flat rate (yoga mat and therapy gun excluded), so the delivered cost is known at every price. Standard delivery: 2 business days processing plus up to 10 business days in transit.
Where to buy
Sports Research (direct) · lowest recorded available price
we earn nothing on this link
checked 3 days agoPrice source: Sports Research, sportsresearch.com product pages, one-time prices, read in a browser October 12, 2026 · checked Oct 12, 2026
$29.95Buy
Ordered by price, lowest first, and labeled so you can see what each link earns us. Commission is never an input to that ordering. If the cheapest retailer pays us nothing, that is still the one we send you to. No link on this page earns us anything; every Buy button is a plain retailer link.
Price history
Latest recorded price: $29.95 at Sports Research (direct), checked . Unchanged since we started checking on Sep 20 (20 checks).
We check each price about once a day, so this is the range we recorded, not necessarily every price there has been. It says what changed, not why, and nothing about where the price goes next.
Verification, Tier D: Could not locate independent data
We could not locate independent testing or certification for this product. That is a statement about our search, not about the product. These programs certify what a company submits to them, so a product can be absent simply because it was never entered, which is not a finding against it. Which certifier databases we searched, and when, is listed below. Where a program is not listed there, we have not checked it and do not imply anything either way.
- Searched 4 certifier databases and found no listing for this product, and located no published test results. Programs we did not search are named below as not checked.
- The testing claim we recorded for this product, with where it appeared: NSF Certified Gluten-Free, Non-GMO Project Verified and American Vegetarian Association Certified Vegan marks, and the checklist line "Third Party Tested" (printed on the label image). With no program named there is no listing to open against it, so it does not raise the verification level.
- Checked NSF Certified for Sport database on Sep 20, 2026: not listed.
- Checked USP Verified database on Sep 21, 2026: not listed.
NSF Certified for Sport: checked, not listed
Checked and absent. The full Certified for Sport directory read of Sep 20, 2026 holds two Sports Research rows, both creatine, and no magnesium L-threonate row for this brand. Absence from a database is not a failed test.
Source: NSF Certified for Sport, NSF Certified for Sport directory: full read, Sports Research rows, September 20, 2026 · checked Sep 20, 2026USP Verified: checked, not listed
Checked and absent. USP's own Verified Products directory was read page by page in a browser on Sep 21, 2026: 16 pages, 159 products, 16 brands, captured in this site's directory snapshot. This brand does not appear in the directory or in its brand facet, and no product in it names this brand. USP verifies the products a company submits to it, so this records which products were submitted and nothing else. Absence from a database is not a failed test.
Source: USP, USP Verified Products directory, full read, September 21, 2026 · checked Sep 21, 2026Informed Sport: checked, not listed
Sports Research is on LGC's own Informed Sport product list of September 2026 with 7 product lines, read in full on Sep 24, 2026, and none of them names this product. Absence from a list is not a failed test: Informed Sport certifies the products a company submits, so this records only that this product is not in the program's published list on that date.
Source: LGC (Informed Sport), Informed Sport product list, September 2026 PDF, full read, September 24, 2026 · checked Sep 24, 2026Informed Choice: checked, not listed
Sports Research is on LGC's own Informed Choice product list of September 2026 with 10 product lines, read in full on Sep 24, 2026, and none of them names this product. Absence from a list is not a failed test: Informed Choice certifies the products a company submits, so this records only that this product is not in the program's published list on that date.
Source: LGC (Informed Choice), Informed Choice product list, September 2026 PDF, full read, September 24, 2026 · checked Sep 24, 2026No test reports located for this product.
Not established: Heavy-metal testing, Label-accuracy testing.
Absence of data is not evidence that a product is clean. It means nobody has published a result we could find.
Label
Form
capsule
Serving size
3 capsules
Active ingredient
Magnesium L-Threonate: 144mg as labeled
Elemental magnesium as printed on this package's own Supplement Facts panel ("Servings Per Container: 30"): "Magnesium 144 mg 34% (from 2000 mg magnesium L-threonate) (Magtein®)" per 3-capsule serving. The panel prints both figures, so the elemental amount is read and the 2000 mg compound weight is recorded beside it; neither is calculated from the other. The panel names one salt and no second salt.
Vegan
Yes
Gluten free
Yes
Allergens
Unknown
Other ingredients
Veggie capsule (hypromellose) (capsule), Rice flour, Rice hulls
Label facts rest on: Sports Research, Supplement Facts panels and label faces: Sports Research MAG LT Magnesium L-Threonate, two packages · checked Sep 20, 2026
Other tracked packages
Same category and format and, for vitamin D, the same labeled strength. Different recorded ingredient-form lists are kept separate. Ordered by container price before delivery; only fresh recorded prices are shown. Formulas, flavors and allergens may differ: check each label. These are browsing options, not recommended substitutes.
$58.95 per container, before delivery
$1.36 per 200mg elemental magnesium, before delivery
Free delivery
Price checked Oct 12, 2026.
Buy at Sports Research (direct) →Label, prices & sources →Compare every magnesium L-threonate we price, per 200mg elemental magnesium →
What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.