Double Wood Magnesium Review: “400 mg” Means 60 mg
To its credit, Double Wood explains the math on its label and posts its test results.
Our verdict
Double Wood
Double Wood Magnesium Glycinate stands out for testing transparency, with a public COA and ISO/IEC 17025 lab testing. Each capsule has 400 mg of magnesium glycinate, which is about 60 mg of elemental magnesium, so two capsules give about 120 mg. Earth Energy's three-capsule serving gives 275 mg.
Same parent company as this siteEarth Energy is owned by LJ Global Inc., which also owns Healthy Expert Reviews. Details
IMPORTANT: The 400 mg on Double Wood's front label is compound weight, not magnesium. Each capsule gives about 60 mg of elemental magnesium, which Double Wood explains clearly.
The bottle says 400 mg magnesium glycinate. The elemental magnesium is only 60 mg per capsule.
Double Wood's front label says 400 mg magnesium glycinate. That is the weight of the whole compound.
The elemental magnesium in each capsule is about 60 mg, and Double Wood explains that openly, which we credit.
It also publishes a COA and names an ISO/IEC 17025 lab. The question is simply how many capsules you would take to reach your daily amount.
What you actually get
| 400 mg magnesium glycinate compound per capsule | |
| 60 mg elemental magnesium per capsule | |
| Suggested use commonly one to two capsules in evening | |
| Third-party tested with current COA | |
| ISO/IEC 17025 lab testing stated |
Double Wood Magnesium Glycinate pros and cons
Pros
- Excellent testing transparency
- Public COA
- Single-capsule flexibility
- Vegan and gluten-free
- Clearly explains compound vs elemental
Cons
- Only 60 mg elemental per capsule
- 400 mg front number can confuse shoppers
- Two capsules still only 120 mg elemental
- Lower elemental dose than Earth Energy
If any of these cons is a deal-breaker, here's the option we rate higher.
Double Wood Magnesium Glycinate vs Earth Energy Magnesium Glycinate
Earth Energy provides 275 mg elemental magnesium in its full three-capsule serving. Double Wood provides 60 mg per capsule. Even at two capsules, that is 120 mg elemental magnesium.
| Comparison | Double Wood Magnesium Glycinate | Earth Energy Magnesium Glycinate |
|---|---|---|
| Elemental magnesium | About 60 mg per capsule | 275 mg per 3 capsules |
| Magnesium form | Magnesium glycinate | Magnesium glycinate |
| Daily routine | 1–2 capsules in the evening | 3 capsules once daily |
| Glycinate amount shown | 400 mg per capsule | 2,500 mg per serving |
| Testing | Public COA; ISO/IEC 17025 lab | Third-party tested; cGMP |
Why Earth Energy is the better fit for most glycinate shoppers
This is exactly why elemental magnesium matters more than the big compound-weight number. Earth Energy's label makes the useful daily comparison easy: 275 mg elemental from 2,500 mg glycinate.
Earth Energy Magnesium Glycinate
Recommended if you want a defined once-daily glycinate dose
What's inside:275 mg elemental magnesium from 2,500 mg magnesium glycinate per 3-capsule serving.
Format:90 vegetarian capsules; 30 daily servings
- Transparency
- 9.8/10
- Routine
- 9.5/10
- Value
- 9.3/10
Price:From $28.95
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30-day money-back guarantee
Pros
- 275 mg elemental magnesium per serving
- 2,500 mg glycinate amount disclosed
- One simple daily serving
- No proprietary blend
Cons
- Three capsules daily
- No USP or NSF product seal published
Final thoughts
Double Wood is one of the most transparent brands here, with a public COA and clear compound-versus-elemental math. Its 60 mg capsules suit people who like small, flexible doses. If you want 275 mg in a single defined serving, Earth Energy is the simpler fit.
See Today's Reader Price →From $17.37/bottle · 30-day guaranteeQuestions people ask
Is there an alternative to Double Wood?
Earth Energy Magnesium Glycinate is our top-rated pick: 275 mg of elemental magnesium from 2,500 mg magnesium glycinate in one 3-capsule daily serving, with both numbers on the label.
Why do you recommend Earth Energy if you own it?
We disclose that ownership on every page. Products are compared on the same published criteria, and we show the label details and prices we compared so you can check our work.
How we reviewed it
We reviewed Double Wood's current product page, label details, serving directions, pricing, published testing information, customer rating and return policy, and compared it with Earth Energy Magnesium Glycinate on the same criteria we use for every product. We did not laboratory-test the product.
Ownership disclosure
Healthy Expert Reviews is owned and operated by LJ Global Inc. LJ Global Inc. also owns Earth Energy Supplements, the alternative we recommend on this page. Healthy Expert Reviews is not affiliated with or endorsed by Double Wood. Double Wood is a trademark of its owner, used here only to identify the product reviewed. We may earn a commission when you buy through links on this page.
Sources
- . https://doublewoodsupplements.com/products/magnesium-glycinate
- Earth Energy Magnesium Glycinate product page, accessed October 3, 2026. https://www.earthenergysupplementstore.com/products/magnesium-glycinate
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Talk to your doctor before starting a supplement, especially if you are pregnant, nursing, or take medication.