Nature Made vs Doctor's Best Magnesium Glycinate 200 mg
Buy Nature Made if you want a tested product; buy Doctor’s Best to pay less. Both give 200 mg of magnesium as a glycinate chelate in a 2-pill serving (Doctor’s Best’s also has lysine). Nature Made is USP Verified. Doctor’s Best is on no public testing list and costs $0.20 a serving against $0.73 at list price.
The verdict
The magnesium is the same. The difference is the testing mark and the price: at list prices, Nature Made costs 3.7 times as much a serving.
Prices are at brand list prices; prices on Amazon differ; checked October 14, 2026. Labels from each brand and NIH’s label database.
Side by side
| Nature Made | Doctor’s Best | |
|---|---|---|
| Magnesium a serving | 200 mg in 2 capsules | 200 mg in 2 tablets |
| Servings a bottle | 30 | 120 |
| Testing list | USP Verified (on USP’s list) | None found |
| List price | $21.99 | $23.99 |
| A serving, at list price | $0.73 | $0.20 |
| Most the label directs a day | 2 capsules (200 mg) | 2 tablets twice a day (400 mg, over the 350 mg limit) |
| Buy | Check price | Check price |
Who each one is for
- Nature Made if you want a product on a public testing list. It is the pick in our magnesium buying guide.
- Doctor’s Best if price matters most. Take one serving (2 tablets, 200 mg); its label’s second serving would take you over NIH’s 350 mg limit for pills.
- Neither if you want the lowest cost per mg: BulkSupplements Magnesium Glycinate Powder costs $0.13 per 200 mg at list price, but its label names glycinate and oxide, so it is a blend.
If you have kidney disease, ask your doctor before you take magnesium. Weak kidneys cannot clear the extra, so it can build up (NIH).
Frequently asked questions
Is Nature Made or Doctor's Best magnesium glycinate better?
Neither has better magnesium: both give 200 mg of magnesium as a glycinate chelate in one 2-pill serving (Doctor’s Best’s chelate also has lysine). Nature Made is USP Verified, which means USP tested that the capsules hold what the label says. Doctor’s Best is on no public testing list and costs less: $0.20 a serving against $0.73, at each brand’s list price. Prices on Amazon differ.
What does the USP Verified mark mean on a magnesium bottle?
U.S. Pharmacopeia tested the product for the ingredients and amounts on its label. It says the label is accurate, not that the supplement works better. A mark on a store listing is not proof; USP’s own list shows which exact products are verified.
Why choose glycinate over citrate or oxide?
Many people choose glycinate because it is gentle on the stomach. In the one trial that compared glycinate with oxide at the same dose (100 mg, in 12 people who had part of their small bowel removed), overall absorption was about the same (23.5% vs 22.8%), and glycinate was better tolerated by every patient (Schuette 1994). At list prices citrate costs less per mg, and it was absorbed better than oxide in small studies (NIH). No trial shows glycinate works better than citrate.
Related
- Thorne vs Doctor’s Best · best magnesium glycinate · third-party tested glycinate
- Types of magnesium compared · magnesium guide
Sources
- NIH Office of Dietary Supplements. Magnesium fact sheet for health professionals (updated January 6, 2026).
- Schuette SA, Lashner BA, Janghorbani M. Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection. JPEN. 1994. PubMed 7815675
- Labels: NIH label 322551 (Nature Made, 2 capsules = 200 mg) and NIH label 322515 (Doctor’s Best). USP’s list of verified products, searched October 14, 2026. Prices: each brand’s own list price, checked October 14, 2026; we quote no Amazon prices.
This page is for information. It is not medical advice.