After three weeks with five glycinate products, the cheapest bottle in the lineup gave us the most elemental magnesium per dollar without a single stomach complaint.
Magnesium glycinate has become the default form for sleep, cramps and stress, and every brand now sells one. The labels all say ‚high absorption‘, but the dose per serving ranges from 120 mg to 275 mg, the price per day from 15 cents to nearly a dollar, and two products need two or three pills to reach the dose on the front. We bought all five from Amazon, weighed the servings, checked the certificates and took each one for four evenings.
How we tested
Certificates mattered as a tiebreaker: NSF Certified for Sport and USP Verified mean an outside lab has checked the dose and screened for contaminants. Taste, mixability and pill size were noted but weighed less.
The results at a glance
| # | Product | Dose and form | Cost | Score | Best for |
|---|---|---|---|---|---|
| 1 | Doctor’s Best High Absorption Magnesium | 200 mg / 2 tablets, TRAACS chelate | ~$0.17/day | 8.9/10 | Best overall value |
| 2 | Thorne Magnesium Bisglycinate | 200 mg / scoop, powder | ~$0.75/day | 8.6/10 | Athletes, tested purity |
| 3 | Pure Encapsulations Magnesium (glycinate) | 120 mg / capsule | ~$0.42/day | 8.3/10 | Sensitive stomachs |
| 4 | Nature Made Magnesium Glycinate | 200 mg / tablet, USP Verified | ~$0.27/day | 8.0/10 | Drugstore pick |
| 5 | NOW Foods Magnesium Bisglycinate Powder | 250 mg / scoop, powder | ~$0.35/day | 7.7/10 | Flexible dosing |
The five products, ranked
Doctor’s Best High Absorption Magnesium
- Albion TRAACS chelate, 100% glycinate/lysinate
- 240 tablets for about $20
- Two tablets per 200 mg dose
The tablets are large but easy to swallow, dissolved cleanly in our water test and caused no stomach upset in four evenings. At 17 cents a day it costs a quarter of the premium picks for the same form.
Thorne Magnesium Bisglycinate
- NSF Certified for Sport
- Dissolves fully in water, mild citrus taste
- The most expensive per day
The powder format lets you dial the dose down to 100 mg, and the NSF seal is the strictest in the lineup. You pay for it: one tub lasts about two months at 200 mg.
Pure Encapsulations Magnesium (glycinate)
- Hypoallergenic, no fillers or coatings
- Small capsules, easy to split doses
- Only 120 mg per capsule, so 200 mg needs two
The cleanest ingredient list we saw and the one product our tester with a sensitive stomach preferred. The low dose per capsule makes it flexible and a bit pricey.
Nature Made Magnesium Glycinate 200 mg
- USP Verified dose and purity
- One tablet per 200 mg
- Large tablet, small 60-count bottle
Widely available and independently verified. The single-tablet dose is convenient; the bottle is gone in two months and the tablet is the biggest in the test.
NOW Foods Magnesium Bisglycinate Powder
- 250 mg per scoop, adjust freely
- Unflavored, mixes into anything
- Slightly chalky in plain water
A solid budget powder from a brand with its own testing lab. It lost points for texture and because the scoop dose runs above the 200 mg most people need.
Who should pick what
- Sleep or stress: any glycinate at 200 mg about an hour before bed. Doctor’s Best is the value pick.
- Muscle cramps after training: Thorne, because the NSF seal matters if you compete, and the powder goes into a shaker.
- Sensitive stomach or on several medications: Pure Encapsulations at 120 mg, and a word with your doctor first.
Frequently asked questions
How much magnesium should I take?
Is glycinate really better than oxide or citrate?
Who should not take magnesium supplements?
Sources: NIH Office of Dietary Supplements, Magnesium Fact Sheet · Schuchardt & Hahn, Intestinal Absorption and Factors Influencing Bioavailability of Magnesium (2017)