Magnesium is needed for every energy (ATP) reaction and to activate Vitamin D – Rosanoff

The 1 Mineral Needed for Every Energy Reaction in Your Body

YouTube 72 minutes

  • [02:20] Magnesium is in thousands of reactions. Estimates of how many enzymes use it as a cofactor run from 300 to 1,000, and she usually says 600. That count leaves out ATP. Most ATP in the body is magnesium-ATP, so nearly every energy reaction needs magnesium.
  • [05:21] It isn't used up, but you lose some every day. Magnesium is recycled through reactions, but the kidneys excrete some daily, so the diet has to keep replacing it.
  • [08:12] Low magnesium changes how genes are expressed, especially biological-clock genes. This has been seen in plants, algae and human cell cultures.
  • [10:59] Serum magnesium is a poor measure. The body holds about 25 g, and less than 1% of it is in the blood. Most labs base their normal range on 1974 US data (0.70–0.95 mmol/L), but ranges and units (mmol/L, mg/dL, mEq/L) differ from lab to lab. To keep serum normal, the body draws magnesium from bone and muscle, so stores can run down while serum looks fine. Ronald Elin named this "chronic latent magnesium deficiency" (CLMD). Researchers now suggest at least 0.85 mmol/L (2.1 mg/dL), but even that misses some cases.
  • [19:10] Supplement trial data. In pooled trials, serum magnesium rose and then levelled off at about 20 weeks. Urinary magnesium kept rising through 50 weeks. She reads this as bone and muscle stores refilling, with the kidneys releasing more as the stores fill.
  • [22:39] Better ways to test. A serum magnesium test is cheap, but standard US panels leave it out, so you have to ask for it. Her preferred measure is the Ehrlich–Rosanoff (ER) scale, the ratio of serum magnesium to serum calcium. It came out of German physician Bodo von Ehrlich's 40 years of practice. You need to know which way the ratio is written (Mg/Ca or Ca/Mg) and whether it uses molar or weight units.
  • [27:50] Other measures. The magnesium tolerance test (an IV or IM dose, then 24–48 hours of urine collection to see how much is kept) is useful but hard to do and has no standard cutoff.
  • [30:30] The Magnesium Depletion Score adds points for risk factors. She named hypertension, heavy alcohol use and PPIs, and couldn't recall the fourth. As far as I know, the published score counts diuretic use and reduced kidney function rather than hypertension. A score of 3 or more suggests depletion.
  • [32:44] "Let your body tell you." Her mentor Mildred Seelig's advice was to take magnesium up to the point of loose stools, then cut back. In one story, a woman with mitral valve prolapse took 700 mg/day (the RDA is about 350–410 mg). Months later, diarrhea signalled her stores were full. She was told to cut back but stay above 150 mg/day, and the prolapse was later gone.
  • [36:45] Calcium and magnesium in the diet. The US dietary Ca:Mg ratio went from 2.6 in 1977 to over 3. French researcher Jean Durlach said it should be no higher than 2.0 by weight. Too much calcium without enough magnesium can end up in soft tissue as calcification.
  • [40:46] Processing removes magnesium. Refined sugar loses almost all of it, white flour about 80% (and enrichment doesn't add it back), and refined oils lose almost all of it. [54:01] High-yield crop varieties have also lowered mineral content per serving.
  • [43:17] Link to vitamin D. Vitamin D needs magnesium to be activated. People low in magnesium can show low serum vitamin D that improves once their magnesium is raised. Taking vitamin D alone increases calcium absorption, which can make the calcium–magnesium imbalance worse, so she advises fixing magnesium first.
  • [46:11] Cholesterol, statins and supplement forms. HMG-CoA reductase, the enzyme statins block, needs magnesium. When magnesium is low, she argues the enzyme isn't regulated properly and LDL goes up. Statins simply shut it down and can lower CoQ10. She says she isn't a physician and is not telling anyone to stop a statin.
  • [1:04:25] Meta-analyses suggest the dose of elemental magnesium matters more than the form (oxide, citrate, lactate and so on). She sees most absorption claims as marketing, because the gut adjusts how much it absorbs. She takes a mix that includes oxide and citrate. Her group's site is https://www.magnesiumeducation.com

Which contains an excellent Mean Serum Magnesium and Prevalence of Chronic Latent Magnesium Deficiency (CLMD) in U.S. Adults - Aug 2026

YouTube Timeline

  • 00:00 Welcome Dr. Andrea Rosanoff (The Magnesium Factor)
  • 03:38 How Magnesium-ATP Powers the Batteries of Life
  • 05:58 Why We Rapidly Deplete Magnesium Every Day
  • 08:03 The Hidden Role in DNA Replication & Biological Clocks
  • 10:44 The Blood Test Fallacy & Flawed Hospital Ranges
  • 16:00 Chronic Latent Deficiency & The 0.85 mmol/L Target
  • 20:18 Supplementation Studies: Rebuilding Bone Stores Takes 1 Year
  • 22:49 The Ehrlich-Rosanoff (ER) Scale for Mineral Imbalance
  • 28:21 Magnesium Tolerance Testing & Clinical Risk Scores
  • 32:45 Dr. Mildred Seelig's Rule: Bowel Tolerance & Repletion
  • 36:41 The Calcium-to-Magnesium Ratio Crisis in Modern Diets
  • 38:48 Why Excess Calcium Without Magnesium Calcifies Soft Tissues
  • 41:16 How Food Processing Strips 80% of Dietary Magnesium
  • 43:29 The Vitamin D Loop: Why Vitamin D Needs Magnesium
  • 46:45 Statins vs Magnesium: Regulating HMG-CoA Reductase
  • 51:23 Converting LDL into HDL: What Statins Cannot Do
  • 54:21 Soil Depletion, High-Yield Crops & Lost Minerals
  • 01:00:17 Whole Foods vs Industrial Snacks: The Modern Dilemma
  • 01:03:17 Calculating Your Ca:Mg Ratio & Open-Access Research
  • 01:04:17 Supplement Guide: Chelates vs Oxides & Elemental Dosing
  • 01:06:40 How GI Absorption Adapts to Your Body's Needs
  • 01:08:49 Dr. Rosanoff's Research at CMER & Final Takeaways

Her Publications

  • 2016 – Rosanoff, Dai & Shapses, "Essential Nutrient Interactions: Does Low or Suboptimal Magnesium Status Interact with Vitamin D and/or Calcium Status?" Adv Nutr 7:25–43. This is her key vitamin D paper. Magnesium is a cofactor for making, transporting and activating vitamin D. The US dietary Ca:Mg ratio is now above 3.0, and the best ratio may be about 2.0. The paper warns that taking calcium and vitamin D while low in magnesium may have unknown health effects. [[PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC4717874)] [VitaminDWiki]
  • 2018 – Dai Q, … Rosanoff A, … Shrubsole MJ, "Magnesium status and supplementation influence vitamin D status and metabolism: results from a randomized trial." Am J Clin Nutr 108(6):1249–1258. Rosanoff is a co-author. In this 12-week RCT with 180 people, each person's magnesium dose was set to bring their Ca:Mg intake ratio down to about 2.3. Magnesium raised 25(OH)D₃ when the starting level was near 30 ng/mL, but lowered it when the starting level was about 30–50 ng/mL. [PubMed]
  • Interview (not peer-reviewed): "Magnesium is needed to activate vitamin D." Richard Passwater interviews Rosanoff for WholeFoods Magazine. She walks through each magnesium-dependent step: making the cholesterol precursor, 25-hydroxylation in the liver, transport out of the liver, and activation in the kidney. [WholeFoods Magazine]

Ca:Mg ratio, serum testing, and the "ER scale" from the interview

  • 2025 – Rosanoff, von Ehrlich & Nelson, "A Proposed Scale to Assess Magnesium Status Using Serum Calcium and Magnesium Ratios." Nutrients 17(23):3671. This is the scale she describes in the video. "ER" stands for Bodo von Ehrlich and Rosanoff. Using the molar serum Mg/Ca ratio, ≥0.4 is the goal and 0.36–0.399 signals hidden depletion, with supplements recommended. [PMC]
  • 2025 – Nelson, Rosanoff & von Ehrlich, "Novel Scale for Clinical Identification of Adverse Magnesium/Calcium Imbalances." Nutrients 17(23):3662. This companion paper applies the scale to 10 published clinical studies. In all 10, the scale identified magnesium deficit more reliably than serum magnesium alone. [PMC]
  • 2022 – Rosanoff, West, Elin et al. (MaGNet), "Recommendation on an updated standardization of serum magnesium reference ranges." Eur J Nutr 61(7):3697–3706. This is the paper she mentions from the COVID era. It proposes 0.85 mmol/L (2.07 mg/dL) as the lower limit of normal. [PMC]
  • 2021 – Fan L, Zhu X, Rosanoff A et al., "Magnesium Depletion Score (MDS) Predicts Risk of Systemic Inflammation and Cardiovascular Mortality among US Adults." J Nutr 151(8):2226–2235. This is the original MDS paper. [DOI]
  • 2016 – Costello, Elin, Rosanoff et al., "The Case for an Evidence-Based Reference Interval for Serum Magnesium: The Time Has Come." Adv Nutr 7(6):977–993. [PMC]
  • 2021 – Costello, Rosanoff, Dai et al., "Characterization of Dietary Supplements Containing Calcium and Magnesium and Their Respective Ratio." Across US supplements containing both minerals, the average Ca:Mg ratio was 2.90. [PMC]
  • 2012 – Rosanoff, Weaver & Rude, "Suboptimal magnesium status in the United States: are the health consequences underestimated?" Nutr Rev 70(3):153–164. It argues that the DRIs may be misleading if people in balance studies had chronic latent deficiency. [PubMed]
  • 2010 – Rosanoff, "Rising Ca:Mg intake ratio from food in USA adults: a concern?" Magnes Res 23(4):S181–93. This is the source of the intake-ratio chart she showed in the interview. [PDF]

Other topics from the interview

  • 2004 – Rosanoff & Seelig, "Comparison of mechanism and functional effects of magnesium and statin pharmaceuticals." J Am Coll Nutr 23(5):501S–505S. This is the statin paper she mentions. It argues magnesium regulates HMG-CoA reductase rather than inhibiting it. [[PubMed](https://pubmed.ncbi.nlm.nih.gov/15466951/)] [Full text]
  • 2021 – Rosanoff, Costello & Johnson, "Effectively Prescribing Oral Magnesium Therapy for Hypertension: A Categorized Systematic Review of 49 Clinical Trials." Nutrients 13(1):195. In patients still hypertensive despite medication, ≥240 mg/day lowered blood pressure. Untreated hypertensives needed about 600 mg/day or more. [PMC]
  • 2021 – Rosanoff, "US Adult Magnesium Requirements Need Updating: Impacts of Rising Body Weights and Data-Derived Variance." Adv Nutr 12(2):298–304. [VitaminDWiki]
  • 2013 – Rosanoff, "Changing crop magnesium concentrations: impact on human health." Plant Soil 368:139–153. This covers the high-yield crop argument from the interview. The VitaminDWiki page also includes another author's criticism of her method. [VitaminDWiki]
  • 2022 – Trapani, Rosanoff et al., "The relevance of magnesium homeostasis in COVID-19." Eur J Nutr 61(2):625–636. [PMC]

2003 Book

  • Mildred S. Seelig & Andrea Rosanoff, The Magnesium Factor (Avery, 2003; ISBN 9781583331569). [Books-Express]

Related in VitaminDWiki

Magnesium Depletion Score - better than Mg blood measurement

Magnesium forms

Magnesium Calcium Ratio

Magnesium - many studies