Harbor & Pine Magnesium Citrate 150 mg
Harbor & Pine · Demo
- Primary ingredient
- Magnesium Citrate
- Per serving
- 150 mg elemental magnesium
- Servings
- 60
- Format
- Capsules
- Price
- $14.99*
- Per serving cost
- $0.25
Not verified
Magnesium comparison
Magnesium Citrate vs Magnesium Oxide
The most directly studied magnesium comparison: solubility, absorption markers, and cost.
Quick answer
This is the magnesium pairing with the most direct research. In small human studies, citrate was more soluble and produced higher absorption markers than oxide. Oxide packs far more magnesium per tablet and is cheaper per 100 mg. Both can loosen stools; citrate is used as a laxative at higher doses.
| Compare | Citrate | Oxide |
|---|---|---|
| Elemental magnesium by weightSuppScout calculation | ~16% | ~60% |
| SolubilityPublished research | Highly soluble | Poorly soluble |
| Absorption studiesPublished research | Higher absorption markers vs oxide | Lower absorption markers vs citrate |
| Digestive effectsPublished research | Laxative at higher doses | Associated with diarrhea at higher doses |
| Typical formats | Powders, capsules, liquids | Tablets, multivitamins |
| Price per 100 mg (demo catalog)SuppScout calculationBased on fictional demonstration listings | $0.08–$0.17 (demo) | $0.04–$0.09 (demo) |
Rows marked with a source type show where the information comes from. See how SuppScout compares.
Who might look at each
Magnesium Citrate
- People comparing forms with more absorption data
Magnesium Oxide
- People prioritizing cost and pill count
These describe common reasons people consider each option — not a recommendation. There’s no universal winner.
Magnesium Citrate and Magnesium Oxide, explained
Magnesium Citrate
A soluble magnesium salt of citric acid. Citrate overview.
Magnesium Oxide
A dense, low-cost, poorly soluble magnesium compound. Oxide overview.
Key differences
- Citrate dissolves readily; oxide does not.
- Studies show higher absorption markers for citrate.
- Oxide is denser and cheaper per 100 mg.
Similarities
- Both are widely available and inexpensive.
- Both can cause loose stools at higher intakes.
Published research
Research overview
A randomized, double-blind study found magnesium citrate more bioavailable than other preparations including oxide, and an earlier study reported greater solubility and absorption for citrate than oxide. Both studies were small and short, and they measured absorption markers rather than health outcomes.[1][2][3]
How to read product labels
- Compare cost per 100 mg elemental magnesium.
- Check whether a “citrate” product also includes oxide.
Products containing each
Magnesium Citrate
Plainlabel Magnesium Citrate Powder (Lemon)
Plainlabel Nutrition · Demo
- Primary ingredient
- Magnesium Citrate
- Per serving
- 300 mg elemental magnesium
- Servings
- 90
- Format
- Powder
- Price
- $21.99*
- Per serving cost
- $0.24
Not verified
Magnesium Oxide
Harbor & Pine Magnesium Glycinate (Buffered) 240 mg
Harbor & Pine · Demo
- Primary ingredient
- Magnesium Glycinate
- Per serving
- 240 mg elemental magnesium
- Servings
- 90
- Format
- Capsules
- Price
- $19.49*
- Per serving cost
- $0.22
Not verified
Harbor & Pine Magnesium Oxide 250 mg
Harbor & Pine · Demo
- Primary ingredient
- Magnesium Oxide
- Per serving
- 250 mg elemental magnesium
- Servings
- 100
- Format
- Tablets
- Price
- $8.99*
- Per serving cost
- $0.09
Not verified
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References
- Walker AF, Marakis G, Christie S, Byng M (2003). Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study. Magnesium Research 16(3). pubmed.ncbi.nlm.nih.govRandomized trial
- Lindberg JS, Zobitz MM, Poindexter JR, Pak CY (1990). Magnesium bioavailability from magnesium citrate and magnesium oxide. Journal of the American College of Nutrition 9(1). pubmed.ncbi.nlm.nih.govStudy
- Magnesium: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.govGovernment
SuppScout links to primary and authoritative sources wherever possible. See our editorial policy for how sources are selected and how corrections are handled.
This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.