Best magnesium oxide 2026, ranked by price per 100 mg of magnesium: Nutricost Magnesium Oxide is lowest at $0.0148 of 5 offers
Same-salt price ranking · prices checked 2026-11-02
Cheapest by declared elemental magnesium is Nutricost Magnesium Oxide: 420 mg of elemental magnesium per serving × 240 servings, offer B06VW5YP1Z, confirmed match observed 2026-11-02, at $0.0148 per 100 mg among 5 ranked oxide offers. Median $0.0293; spread ×4.3. 2 on review; 51 of 61 labels unmatched as of 2026-11-02.
computed from dated offers
Chart data
| Displayed chart text |
|---|
| Nutricost |
| $0.0148 |
| tnvitamins |
| $0.0258 |
| Douglas Laboratories |
| $0.0293 |
| Wonder Labs |
| $0.0356 |
| Carlson |
| $0.0636 |
| median $0.0293 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
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Replace the observed container price with yours to calculate the declared elemental cost per 100 mg.
Same-salt comparison appears here.
Which oxide label is cheapest by declared elemental magnesium per 100 mg, and by how much?
Nutricost Magnesium Oxide is cheapest by declared elemental magnesium at $0.0148 per 100 mg among 5 ranked offers, against the same-salt median $0.0293. Prices observed 2026-10-26 to 2026-11-02. Every table row represents one ASIN and observation date; linked label versions share one rank. The physical form and capsule verdict are shown beside each offer.
computed5 unique ranked offers support a median and an interquartile band within oxide.
| Rank | Brand | Product | Mg × servings | Offer, price, date | USD / 100 mg | Mg / $1 | Match | Form | Capsule verdict | DSLD id | Retailer |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Nutricost | Magnesium Oxide (1 offer · 2 label versions) | 420 mg × 240 servings | B06VW5YP1Z; $14.95; 2026-11-02; $1.87 a month | $0.0148 | 6,757 mg | confirmed | Capsule | needs-00 | 223424 | Check current price at Amazon |
| 2 | tnvitamins | Magnesium Oxide 420 mg (1 offer) | 420 mg × 120 servings | B0DBM66LDN; $12.99; 2026-11-02; $3.25 a month | $0.0258 | 3,876 mg | confirmed | Capsule | needs-00 | 336940 | Check current price at Amazon |
| 3 | Douglas Laboratories | Magnesium Oxide (1 offer) | 300 mg × 250 servings | B07L6PFS17; $22.00; 2026-11-02; $2.64 a month | $0.0293 | 3,413 mg | confirmed | Capsule | fits-0 | 245309 | Check current price at Amazon |
| 4 | Wonder Labs | Magnesium Oxide 400 (1 offer · 3 label versions) | 483 mg × 125 servings | B007ZCLOQU; $21.49; 2026-11-02; $5.16 a month | $0.0356 | 2,809 mg | confirmed | Tablet or Pill | not-applicable | 261002 | Check current price at Amazon |
| 5 | Carlson | Magnesium Gels 400 mg (1 offer) | 400 mg × 100 servings | B001LF39JM; $25.42; 2026-11-02; $7.63 a month | $0.0636 | 1,572 mg | verified | Softgel Capsule | not-applicable | 216334 | Check current price at Amazon |
Source · Amazon via licensed data provider; NIH DSLD · Unique ASIN × date; 5 ranked unique oxide offers, prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
Where does each oxide offer sit against the same-salt median?
Among 5 ranked oxide offers, the median is $0.0293 per 100 mg, against $0.0148 for the lowest priced offer by declared elemental magnesium. The P25–P75 band spans $0.0258 to $0.0356; n=5. Prices observed 2026-10-26 to 2026-11-02. Each point is one unique offer.
computed
Chart data
| Displayed chart text |
|---|
| n=5 |
| P25 $0.0258 |
| P75 $0.0356 |
| median $0.0293 |
| Statistic | USD per 100 mg |
|---|---|
| Lowest | $0.0148 |
| P25 | $0.0258 |
| Median | $0.0293 |
| P75 | $0.0356 |
| Highest | $0.0636 |
Source · Ranked unique retail offers · R7 quantiles; 5 ranked unique oxide offers, prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
What would 30 days of oxide cost at the label serving and at the Daily Value reference?
For the lowest priced ranked oxide offer by declared elemental magnesium, 30 days cost $1.87 at the label's own serving, against $1.86 at the 420 mg Daily Value reference in 21 CFR 101.9. These are computed from the observed price and declared elemental amount, prices observed 2026-10-26 to 2026-11-02; arithmetic on the label, not intake advice.
computed with assumption
Chart data
| Displayed chart text |
|---|
| Nutricost |
| $1.86 · $1.87 |
| tnvitamins |
| $3.25 · $3.25 |
| Douglas Laboratories |
| $2.64 · $3.69 |
| Wonder Labs |
| $4.49 · $5.16 |
| Carlson |
| $7.63 · $8.01 |
| Douglas |
| Laboratories |
| Offer | At label serving, 30 days | At 420 mg DV, 30 days |
|---|---|---|
| Nutricost Magnesium Oxide | $1.87 | $1.86 |
| tnvitamins Magnesium Oxide 420 mg | $3.25 | $3.25 |
| Douglas Laboratories Magnesium Oxide | $2.64 | $3.69 |
| Wonder Labs Magnesium Oxide 400 | $5.16 | $4.49 |
| Carlson Magnesium Gels 400 mg | $7.63 | $8.01 |
Arithmetic on the label, not intake advice.
Source · Observed price; NIH DSLD serving · 30 days; 420 mg DV reference, 21 CFR 101.9; 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
Which oxide prices are on review, and why are they outside the ranking?
2 unique oxide price observations are on review as of 2026-11-02, against 5 ranked offers. The table shows each observed container price and the match reason. A provisional observation has no computed price per 100 mg here because its pack or dose has not passed the label match checks.
measured2 price observations for oxide remain on review with reasons shown below.
| Label | Observed container price | Review reason | Status |
|---|---|---|---|
| BulkSupplements.com Magnesium Oxide Powder | $17.97 observed 2026-09-11 | pack weight differs: the offer lists 250 g, the label 500 g | provisional |
| NusaPure Magnesium Oxide 1000 mg | $19.35 observed 2026-09-21 | the filed elemental amount (1000 mg per serving) is likely the compound mass | provisional |
Source · Amazon via licensed data provider · Match classifier; 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
How many oxide labels have no matched US price?
51 of 61 labels with recognized oxide have no published US retail price match as of 2026-11-02, against 5 unique ranked offers and 2 on review. The rows below are individual NIH DSLD records, not missing values inferred from a price series. Open a label to check its filed serving and form.
measured5 ranked offers, 2 on review and 51 unmatched of 61 recognized oxide labels.
| Label | Filed elemental mg | DSLD id |
|---|---|---|
| Basic Vitamins Magnesium 250 mg | 250 mg | 250165 |
| Carlson Magnesium Gels 400 mg | 400 mg | 216338 |
| DC Magnesium 500 mg | 500 mg | 245144 |
| DC Magnesium 500 mg | 500 mg | 267036 |
| DC Magnesium 500 mg | 500 mg | 267037 |
| DC Magnesium Oxide 400 mg | 241 mg | 265891 |
| DC Magnesium Oxide 400 mg | 241 mg | 267034 |
| Douglas Laboratories Magnesium Oxide | 300 mg | 232875 |
Source · NIH DSLD; published price matches · Recognized salt labels; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
Does the lowest priced oxide label fit in its filed capsule?
The lowest priced oxide offer by declared elemental magnesium is $0.0148 per 100 mg, against a size 000 capsule capacity of 1,100 mg at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Its filed label's mass balance verdict is needs-00. Capsule arithmetic applies only when the label names a capsule and a defined salt, prices observed 2026-10-26 to 2026-11-02.
computed with assumption| Offer | Physical form | Capsule verdict | DSLD id |
|---|---|---|---|
| Nutricost Magnesium Oxide | Capsule | needs-00 | 223424 |
| tnvitamins Magnesium Oxide 420 mg | Capsule | needs-00 | 336940 |
| Douglas Laboratories Magnesium Oxide | Capsule | fits-0 | 245309 |
| Wonder Labs Magnesium Oxide 400 | Tablet or Pill | not-applicable | 261002 |
| Carlson Magnesium Gels 400 mg | Softgel Capsule | not-applicable | 216334 |
Source · NIH DSLD; salt mass budget · Powder density 0.8 g/mL (top of 0.6–0.8); 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How is each price observed and matched to a label?
5 unique oxide offers passed brand, salt, form, elemental amount and pack checks, against 2 on review as of 2026-11-02. Retail observations come from Amazon via a licensed data provider; one ASIN and observation date count once. The public method lists the fields that must agree before an offer receives a rank.
computed| Layer | Method and date |
|---|---|
| Labels | NIH DSLD snapshot 2026-08-10 |
| Offers | Amazon via licensed data provider, prices observed 2026-10-26 to 2026-11-02 |
| Ranking | Confirmed or verified match, unique ASIN × date |
Source · NIH DSLD; Amazon via licensed data provider · Release 2026-08-10-f441aa9f · release 2026-08-10-f441aa9f · CSV · method