9 Warning Signs Your Body Is Begging for Magnesium

Dr. Eric Berg DC| 00:09:24|Mar 14, 2026
Chapters9
The chapter highlights that many people misattribute fatigue and stress to other causes, when hidden magnesium deficiency is the root issue, noting that most magnesium is stored in bones and cells rather than blood. It warns against relying on blood magnesium levels to assess deficiency.

Magnesium deficiency hides in plain sight—Dr. Eric Berg DC reveals 9 telltale signs and practical tips on supplementation and absorption.

Summary

Dr. Eric Berg DC argues that magnesium deficiency is a widespread, overlooked culprit behind fatigue, anxiety, insomnia, and more. He notes that most magnesium sits in bones and cells, with only 0.3% in blood, making blood tests a poor indicator of total magnesium status. He lists up to nine warning signs, from sudden anxiety and waking at 2:00 a.m. to sugar cravings and heavy limbs, tying many to impaired calcium-magnesium balance and mitochondrial energy production. Berg explains how stress, insulin resistance, low stomach acid, and even medications can deplete magnesium, and he emphasizes magnesium’s role in relaxing muscles and keeping arteries flexible. He also discusses practical supplementation guidance, recommending magnesium glycinate over magnesium oxide (which he says is only about 3% absorbed). He shares dosing strategies (300–400 mg multiple times a day for deficiency correction), timing (late in the day for sleep support), and lifestyle tweaks (low-carb diet to improve absorption, and addressing vitamin D and hydrochloric acid needs). The video ends with a tease about a follow-up on different magnesium forms. Throughout, Berg grounds his advice in how magnesium supports relaxation, sleep, heart health, and overall energy production in mitochondria.

Key Takeaways

  • Only 0.3% of magnesium is in blood serum, so blood tests often misjudge total magnesium status.
  • Nine hidden signs include sudden anxiety, middle-of-the-night wakefulness, eye tetany, random chest tightness, headaches, sugar cravings, wired-but-tired, restless legs, and heavy limbs.
  • Magnesium glycinate is preferred over magnesium oxide due to up to 80% absorption versus about 3% for oxide.
  • To correct deficiency, use 300–400 mg of magnesium glycinate multiple times a day rather than a single large dose.
  • Magnesium supports relaxation (calming brain and muscles), helps prevent calcification, and may influence blood pressure and atrial fibrillation risk.
  • Factors that deplete magnesium include stress, sugar, caffeine, alcohol, high insulin, low stomach acid, medications, and low vitamin D.
  • Best take time is toward the end of the day to aid sleep, with options for powder or pills; beware of diarrhea if taking large single doses beyond 400 mg.

Who Is This For?

Essential viewing for health-conscious adults, especially those with fatigue, anxiety, sleep issues, insulin resistance, or cardiovascular concerns who want practical guidance on magnesium status and supplementation.

Notable Quotes

"There’s over 300 medications that can deplete your magnesium."
Dr. Berg begins by outlining how easily magnesium can be depleted by drugs and lifestyle factors.
"Magnesium is the master controller over calcium. Magnesium controls the relaxation."
Explains the calcium-magnesium dynamic and how it affects muscle contraction and relaxation.
"Magnesium glycinate… you absorb 80%."
Gives specific absorption data contrasting glycinate with oxide.
"If you take more than 400 milligrams… it goes through the urine."
Dosing guidance on single-session absorption limits.
"...magnesium can greatly help reduce those cravings very easily."
Links magnesium to sugar/carbohydrate cravings.

Questions This Video Answers

  • How can I tell if I’m magnesium deficient beyond a blood test?
  • What are the best forms of magnesium for sleep and anxiety relief?
  • Why is magnesium glycinate preferred over magnesium oxide?
  • How should I dose magnesium to correct a deficiency without causing diarrhea?
  • Can improving hydrochloric acid and vitamin D status enhance magnesium absorption?
Magnesium deficiencyMagnesium glycinateMagnesium oxideCalcium-magnesium balanceMitochondrial energyAtrial fibrillation riskInsulin resistanceStomach acid hydrochloric acidVitamin D interactionSleep and relaxation
Full Transcript
A lot of people think they're tired, inflamed, and stressed for no reason. When in reality, they have one huge mineral deficiency, and that is magnesium. Today, we're going to discuss the nine hidden magnesium deficiency symptoms that most doctors don't even realize. Most of the storage of magnesium is inside your bones as well as inside your cells. only onethird to 1% that's 0.3% of your magnesium is in your blood serum. And so the worst mistake that people make, especially doctors, when they're evaluating magnesium, is to depend on this blood level of magnesium. That is a big mistake. Let's say you want to determine someone's wealth by having them show you what they have in their wallet as far as their coins. That is not a good place to determine their wealth. You want to look actually in their bank account. you don't want to look in their pocket. Well, that's the exact mistake that a lot of people make when they're looking into the blood for not just magnesium, but other nutrients as well. There's over 300 medications that can deplete your magnesium. Let me also just show you all the other things that can deplete your magnesium. Stress, sugar, caffeine, alcohol, having high levels of insulin because your carbs are too high. And a large percent of the population has insulin resistance. So, they can't even absorb the normal amounts of magnesium. Low hydrochloric acid in your stomach, chances are you don't have enough hydrochloric acid. We've already covered the medication. Low salt and low vitamin D can all lower your magnesium levels. Now, let's go through the hidden magnesium deficiency symptoms. Number one, anxiety. I'm talking about a sudden anxiety that comes out of nowhere. There's no real reason to have anxiety and all of a sudden you feel anxious. could also be a panic attack as well. You want to think about magnesium as your breaks. Okay? And without magnesium, you have no breaks. So then you can't stabilize the nervous system. All right. Number two, waking up at 2:00 a.m. This many times can be related to high levels of cortisol. Now, there's many reasons why people have cortisol in the middle of the night. It could be a blood sugar issue. It could be a stress issue. But one of the key things that magnesium does is it suppresses and it keeps cortisol under control. Now a really classic deficiency of magnesium would be eye twitching. That's called tetany. It's a classic magnesium deficiency. And what's happening deep inside the muscle is that magnesium because it's the master controller over calcium. There's an imbalance. We have too much calcium and not enough magnesium to control it. So the simplicity of this is calcium controls the contraction okay of the muscle. Magnesium controls the relaxation and if there's not enough magnesium all you get is this contraction this tetany and it is the mineral to prevent calcification in your body. If you take a look at even heart attacks, for example, deep in your cells, you have calcium crystals building up in the mitochondria that then interfere with the normal contraction and relaxation. Magnesium will keep your joints from calcifying. Magnesium keeps the arteries from becoming stiff. I mean, think about how many people have high blood pressure as they get older, which many times is merely a magnesium deficiency. Migraines, headaches can be a magnesium deficiency. Think about how many people have muscle spasms. If you could just kind of scan your body and you have tight muscles anywhere, chances are you need more magnesium. Next one is heart pounding after eating. Magnesium is so important to relax the heart. Many of the heart medications really mimic the magnesium effect. So without magnesium, the arteries get stiff, they contract, blood pressure goes up. that can lead to atrial fibrillation, which is a very common and classic magnesium deficiency for which you need a lot of magnesium over a long period of time. And don't worry, at the end of the video, I'm going to show you what type of magnesium you should take and when to take it and how much to take it. Number five is feeling exhausted from thinking, right? Because at the very foundation of the creation of energy, you need magnesium in the mitochondria. So just thinking too much actually makes you tired. But magnesium can easily fix that. Our brain is only 2% of our whole body, but it uses 20% of the energy. Next one is random chest tightness. Now, you might be thinking heart attack, but if you're low in magnesium, you won't have that relaxation of the smooth muscle. Low magnesium allows calcium to go into the heart tissues and start to cause more contraction and more tightness. Next one, number seven, is sugar or carbohydrate cravings. So, I've noticed when I put people on magnesium, many times they don't crave as much as they did before and they're really surprised because they thought it was just a carb craving that wasn't connected to anything. But magnesium can greatly help reduce those cravings very easily. Next one is wired but tired. You go to bed and you lay there and you just can't get into a deep, restful, relaxed sleep. Magnesium helps calm the brain, calm the muscles, and without magnesium, your brain and your body just has this nervous energy. It can't relax. Another symptom that's related that I didn't put on this list is restless leg syndrome. That could be a magnesium deficiency, too, where your legs are just full of energy and you need to either massage the legs or go for a jog in the middle of the night. I had that for many, many months. Last one. Number nine is feeling really heavy. Like you feel like you're 200 lbs. It's like what's going on? My legs are heavy. I feel like I'm trudging through water. What is going on? That is a magnesium deficiency. And this is because the energy factories called the mitochondria are dependent on magnesium and you don't have enough to power the mitochondria. So basically it's taking more effort to move your body and your muscles. Now let's talk about what type of magnesium is best. What magnesium is the worst is magnesium oxide. That is the magnesium that they sell at CVS drugstores. It's the type of magnesium that most the research on magnesium is done with. And the problem with magnesium oxide is you only absorb 3%. Okay, 3%. And so you'd have to take a tremendous amount to have it work. But the problem is when you take more you get diarrhea. So a much better source of magnesium is magnesium glycinate. With magnesium glycinate, you not only have magnesium, but you also have glycine, which is a type of protein that helps GABA in our brain. So, it's really good for calming us down, helping us sleep, and you absorb 80%. Now, some people will say, "Oh, magnesium glycinate doesn't cross the bloodb brain barrier, so it can't really affect our sleep." But that's actually not true because a lot of mechanisms that involve sleep are not actually even in the brain. They're in your gut. They're in your tissues. And so by giving your body more magnesium, it can indirectly affect the brain. The best time to take magnesium is toward the later part of the day. I like to take mine after dinner sometime. Sometimes I'll take pills, sometimes I'll take powder. Powder is much easier to take. You mix it with some water. You drink it down. If you mix it with warmer water, it will completely dissolve. Sometimes I don't have time to warm the water and sip it like tea, so I'll just put it in cold water and slug it down. And one thing you need to know, when you take more than 400 milligrams of magnesium glycinate at any one time, it goes through the urine. Okay? So our bodies can only absorb certain amounts at a time. If you really wanted to create a therapeutic benefit, let's say you're dealing with atrial fibrillation or some type of major deficiency like osteoporosis, you would want to take magnesium glycinate 300 milligrams to 400 milligrams several times a day. Okay? And that way you can get much more absorption. A couple of things that will help you. Going in a lowcarb diet, low carb diet to fix insulin resistance. That will allow you to absorb more magnesium. Also, if you're getting older, if you're over the age of 50 or 60, chances are you have low hydrochloric acid. And the way that you know you have that is if you have like any indigestion or heartburn or gird in which case if you took something called betane hydrochloride not only would that fix your stomach but you're going to absorb a lot more magnesium and other minerals. And also it takes vitamin D to absorb magnesium and it also takes magnesium to absorb vitamin D. Most people are deficient in vitamin D. Taking both of those can go a long way in a lot of different problems. Also, be careful with the caffeine. A lot of people drink way too much coffee. I'll do one small cup of coffee in the morning and that's it for the day. And once you do that, since we're on the topic of magnesium, I have another video for you describing the different types of magnesium. And I put that video right here. Check it out.

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