Carolyn Dean, MD, ND — The Magnesium Miracle
Carolyn Dean, MD, ND is a physician with dual training in conventional and naturopathic medicine who has spent more than three decades researching magnesium's role in human health. Her book The Magnesium Miracle, first published in 2003 and updated in multiple editions, is the most widely read consumer synthesis of magnesium research available — and has introduced millions of people to the science of magnesium deficiency.
Key Contributions:
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Synthesized the research base on magnesium and over 65 health conditions in accessible, consumer-facing language
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Documented the relationship between magnesium deficiency and anxiety, depression, insomnia, muscle pain, fatigue, and cardiovascular disease — drawing on the peer-reviewed literature including Seelig's and Rosanoff's work
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Identified iatrogenic magnesium depletion — the role of common medications (diuretics, PPIs, antibiotics, oral contraceptives, statins) in depleting the body's magnesium stores
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Advocated for the use of multiple forms of magnesium supplementation, including both oral and transdermal approaches, based on individual tolerance and absorption
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Her ReMag® liquid magnesium product represents her attempt to address the bioavailability limitations of conventional oral magnesium forms
📚 Dean C. The Magnesium Miracle. 2nd ed. Ballantine Books, New York. 2017.
How to Contextualize Dean's Work:
Dean's contribution is primarily synthesis rather than original primary research — she aggregates and interprets the peer-reviewed literature rather than conducting her own clinical trials. This is a valuable and important role, but it means her claims are only as strong as the underlying research she cites.
Her work is best treated as a well-researched guide to what the magnesium literature shows, with the understanding that some of the primary research she draws on (particularly regarding transdermal absorption) carries the methodological limitations described elsewhere in this hub.
Mark Sircus, ND — Transdermal Magnesium Therapy
Mark Sircus, ND is a naturopathic physician who authored Transdermal Magnesium Therapy, the primary book-length treatment of topical magnesium application as a clinical tool. His work synthesizes the Shealy and Waring research alongside broader naturopathic clinical experience, and provides the most detailed consumer-facing guide to the practical application of transdermal magnesium.
Key Contributions:
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Brought the Shealy and Waring research into a single accessible framework for practitioners and consumers
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Detailed practical protocols for transdermal magnesium application — sprays, soaks, creams — and their respective use cases
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Addressed the specific advantages of transdermal delivery for populations who cannot tolerate oral magnesium — including people with IBS, Crohn's disease, and other GI conditions
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Emphasized the importance of magnesium chloride specifically (vs. other forms) for transdermal applications, citing the form's high solubility and historical use in clinical settings
📚 Sircus M. Transdermal Magnesium Therapy. 2nd ed. Mark Sircus. 2011.
How to Contextualize Sircus's Work:
Sircus's work is the most directly relevant to transdermal magnesium specifically. Like Dean, his contribution is primarily synthesis and clinical application rather than original research. His claims about absorption rates and clinical efficacy extend somewhat beyond what the peer-reviewed evidence fully supports — which is worth noting while also recognizing the practical clinical value of his protocols.
The honest framing for both Dean and Sircus: their work represents the best available clinical synthesis of the magnesium research literature, not a replacement for that literature. They point you toward the right questions — the peer-reviewed studies are where you verify the answers.
Why Both Voices Matter
Peer-reviewed research is rigorous but often inaccessible. Clinical synthesis work like Dean's and Sircus's makes that research available to the people who need it — patients, practitioners, and consumers trying to make informed decisions about their health.
Both researchers have limitations — their work is only as strong as its sources, and some of those sources are themselves preliminary. But they have also created the most accessible, detailed, and practically useful literature on magnesium supplementation available anywhere.
At LTGLN, we reference their work as part of the broader context of magnesium research — while being clear about where the evidence is strong, where it is preliminary, and where the primary research is still developing.
The magnesium research field is growing rapidly. Studies that were preliminary five years ago are now being confirmed in larger trials. The work of Dean, Sircus, Seelig, Rosanoff, and others has kept this research in the public conversation long enough for that confirmation to happen.
Frequently Asked Questions
Q: What is The Magnesium Miracle by Carolyn Dean?
A: The Magnesium Miracle by Carolyn Dean, MD, ND is the most widely read consumer book on magnesium nutrition. It synthesizes peer-reviewed research on magnesium's role in over 65 health conditions — including sleep, anxiety, cardiovascular health, and hormonal balance — and presents the case that widespread magnesium deficiency is an underappreciated driver of modern illness. It is regularly updated; the most current edition is recommended.
Q: What is Transdermal Magnesium Therapy by Mark Sircus?
A: Transdermal Magnesium Therapy by Mark Sircus, ND is the primary book-length treatment of topical magnesium application as a clinical tool. It synthesizes the Shealy and Waring research alongside naturopathic clinical experience, and provides detailed protocols for magnesium sprays, soaks, and creams. It is particularly useful for people with GI conditions that limit oral magnesium tolerance.
Q: Are Carolyn Dean and Mark Sircus's claims about magnesium scientifically valid?
A: Both Dean and Sircus synthesize genuine peer-reviewed research, and their core claims about magnesium deficiency being widespread and consequential are well-supported by the scientific literature. Some specific claims — particularly around exact transdermal absorption rates or the superiority of transdermal vs. oral delivery — extend beyond what current peer-reviewed evidence fully confirms. We recommend reading their work alongside the primary research it cites, which we summarize elsewhere in this hub.
Q: What medications deplete magnesium?
A: Research summarized by Carolyn Dean and others identifies several common medication classes that deplete magnesium: proton pump inhibitors (PPIs like omeprazole and esomeprazole), diuretics (thiazide and loop diuretics), certain antibiotics (aminoglycosides, amphotericin B), oral contraceptives, and some diabetes medications. Anyone taking these medications regularly should consider discussing magnesium status with their healthcare provider.
→ View our full sourcing documentation and Certificate of Origin on our Purity & Sourcing page.
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