Why Magnesium is so good for us…and yet we have so little of it 

My most viewed video on youtube to date has been on the benefits of Magnesium on our overall health. In this blog, I summarise the most useful points from that video.

1) The majority of chronic illnesses are driven by chronic inflammation. With regards to  the heart, atherosclerosis (hardening of our blood vessels) is the process that  eventually leads to heart attacks and this is caused by chronic low grade  inflammation. The inflammation is caused by lifestyle factors such as smoking, poor  nutrition (especially processed foods), lack of exercise, lack of good quality sleep and  stress.

2) As the arteries harden over a number of years, it becomes more difficult for blood  to get to our vital organs such as our brain, kidneys and heart. As these organs start  getting deprived of blood they start malfunctioning.

3) Any agent which can improve the blood supply to our vital organs can offer  potential benefits to our health. Magnesium, in that sense, has the following  beneficial properties:

a) It can help relax smooth muscle and therefore relaxes our blood vessels allowing  blood to get through more easily
b) It is anti-inflammatory
c) It has some anticoagulant properties which again help blood to travel through the  hardened blood vessels more easily

What is Magnesium?

Magnesium is both a mineral and an electrolyte. It is the 4th most abundant mineral in the  body. It is necessary for electrical activity in the heart and the brain and is also a co-factor  in more than 300 reactions within the body. The recommended daily allowance is 400-420 mg for men and 310-360mg for women. However, our daily intake is far less than this. We  should be taking 400mg daily but the majority of people take between 240- 370 mg at  most. It is estimated that 75% of the population in the western world takes in less  magnesium than is recommended. It is also important to understand what happens to the  magnesium once we have ingested it. 30-40% is absorbed from our gut and also our small  bowel. Some of it is excreted through our kidneys but then the kidneys try and re-absorb it  especially when we are magnesium deficient. Magnesium is also interesting because only 1-2% is  available in the blood. Most of the magnesium is in bone (67%) and within the cells (31%).  Hence when we look at measuring magnesium levels in a routine blood test, we are only  measuring 1-2% of the total amount of magnesium present within our bodies and this is why the blood test is not a good marker of total body magnesium content.

Why are we Magnesium deficient?

The majority of us are Magnesium deficient. Here are the reasons why:

1) We take in less than we should.

This is because of modern farming methods which serve to deplete the magnesium in soil.  Processing depletes magnesium further.​

2) We absorb less of it from our stomachs

Reflux disease has become hugely prevalent because of the bad food that we are being fed  and a large number of people are now on chronic proton pump inhibitors to reduce acid  production. Unfortunately acid is necessary for absorption of magnesium and it is well  recognised that chronic proton pump inhibitor use is associated with an increased risk of  magnesium deficiency.

Carbonated beverages also reduce the absorption of magnesium and can compound the  problem.​

3) We use up a lot more magnesium these days

We are using up a lot more magnesium now compared to a hundred years ago. Remember  Magnesium plays a role in over 300 reactions within our bodies. Stress, which is ubiquitous  these days, results in increased Magnesium break-down. Lack of sleep also results in  increased magnesium usage. There is a lot more sugar in our food these days and  Magnesium is required to break sugar down and this again causes depletion of  magnesium.

4) We excrete a larger than necessary amount of magnesium

Coffee, Tea and pharmacological diuretics all cause us to excrete more magnesium in our  urine. In particular diuretics will actually stop the kidneys from re-absorbing magnesium.

You can therefore see why we, as a population have become so deficient in this vital  mineral/electrolyte.

What are the effects of magnesium deficiency?

The signs and symptoms are usually subtle and often we put them down to the rigors of  modern day living. In particular, tiredness, anxiety, sleep disturbance, depression, restless  legs and even heart palpitations can be caused by magnesium deficiency. Hardening of the  arteries can cause elevated blood pressure readings. Improving magnesium levels can help  with all these symptoms. In addition it can help achieve better control of blood pressure  and also diabetes.

How do you confirm whether you are deficient?

This can be difficult because the blood test is virtually useless as it only measures the 1-2%  of magnesium in the blood and does not give an accurate assessment of total body  magnesium. If the blood test shows that the magnesium levels are normal then you can  not be sure because it may be falsely reassuring but if the blood test is indeed very low  then it is very likely you are deficient.

A better way to measure Magnesium levels is to measure the content of magnesium in the  red cells. This is called Red cell Magnesium Count. Unfortunately few laboratories (in the  UK) offer this measurement routinely. Another way to get a more accurate assessment of  body magnesium stores is to measure the content of magnesium in the urine. Again this is  not a routinely available test in most laboratories. An easier way is simply to increase your  magnesium levels and see if you notice a difference.

Why don’t doctors recommend Magnesium?

There are several reasons for this:

1) There are no large scale randomised trials to provide an evidence base for its  benefits. This is largely because most large scale trials are very expensive to run and  are pharma-sponsored. No pharma company is going to profit from magnesium  and therefore there is little incentive is studying its benefits. However a search on  Pubmed reveals several small scale studies which indirectly point to magnesium  being essential for our good health.

2) It is difficult to measure and the most commonly used method which is a simple  blood test is hugely flawed and can often give normal values even in those who are  very deficient.

3) Most doctors are brainwashed by the pharmaceutical industry into believing that  the only remedy to any problem is a set of pills.

How do I increase my magnesium levels?

There are several ways:

1) Improve intake by avoiding processed foods and eating organically grown  magnesium rich foods from local growers. Almonds, Spinach, Cashew nuts, peanuts  all contain lots of magnesium. Magnesium can also be absorbed through the skin  and Magnesium Oil which is available in many health shops can help when applied  topically. Similarly the addition of an oral magnesium supplement can greatly boost  magnesium levels and reduce symptoms of magnesium deficiency.

2) Increasing the absorption of magnesium through the gut by reducing reliance on  proton pump inhibitors. If you have reflux, alternative agents such as H2 receptor  blockers do not cause magnesium deficiency and could provide relief from reflux  equally well.

3) Reducing the breakdown of magnesium by maintaining a good lifestyle – better  sleep patterns, management of stress and regular exercise help. Also reducing  sugar intake is very helpful.

4) Reducing excretion of magnesium by avoiding diuretics such as coffee and tea can  help

Can Magnesium be harmful?

I would always recommend that you seek your own doctor’s counsel before taking any  supplements so that they can advise you after evaluating your medical history. Truthfully at  recommended daily allowances, magnesium supplementation is very safe. The only caveat  is if you have severe kidney disease in which case i would again recommend taking your  doctor’s advice. Some people do develop a runny stomach on certain preparations.  Magnesium glycinate in particular is generally well tolerated in those who have issues with  diarrhoea with other forms of magnesium.

What preparation and what dose is best?

As there are so many preparations, it is beyond the scope of this review to go through each  and every one of them. In general, magnesium oxide is least effective and best avoided. I  have used Magnesium taurate 125 mg twice a day with great success in many of my  patients. Similarly Magnesium Citrate at 200 mg daily is also very effective as is Magnesium  glycinate. Magnesium supplements are very easily available at health food stores and  online suppliers such as Amazon.

I hope you found this post useful. Here is a link to a video on this subject. I would love to  hear your comments on whether you have used magnesium and whether you have  benefited in some way from it.

About the Author:

I'm Dr Sanjay Gupta, a Consultant Cardiologist with specialist interest in Cardiac Imaging at York Teaching Hospital in York, UK. I believe that high quality reliable jargon-free information about health should be available at no cost to everyone in the world.


  1. Chris V 21st August 2018 at 2:10 am - Reply

    Thanks to your video, i was encouraged to try taurate. To my surprise (and joy), after around 2 weeks, my palpitations greatly reduced

    God bless you Dr. Gupta!

  2. Mrs Patricia Beadle 20th September 2018 at 10:45 pm - Reply

    Was diagnosed with svt 18 months ago, but in the last 3 months it was discovered from a blood test my thyroid is producing too much thyroxin. Now taking Slozem, Carbimazole and Bisoprolol. Also have esophigitis with spasms and take Esomeprazole.
    Would Magnesium be of benefit to me please.

  3. Ani 23rd October 2018 at 12:33 am - Reply

    So is it a no no if you have ckd?? I fear the use of many medications created the problem and added new problems.

  4. Christine Somerville 9th December 2018 at 8:54 pm - Reply

    Very informative thank you for taking the time to write this article. I am definitely going to try magnesium. Have developed troublesome ectopics and would love to reduce the symptoms.

  5. Artur 10th December 2018 at 1:15 pm - Reply

    Thank you very much, dear Sanjay

  6. AnnesK 27th March 2019 at 3:17 pm - Reply

    Over a year now that I have been diagnosed as having PVC and have been put on 2 types of beta-blockers. Your write up has just came in handy to further understand my condition and the use of magnesium. Hopefully this will help suppress my PVCs and not getting an ablation done.

    Thanks again Dr. Sanjay

  7. Dave 23rd June 2019 at 8:45 pm - Reply

    Thank you Doctor for such an informative video.

    • Jill Wharrier 20th July 2019 at 12:15 pm - Reply

      Thank you Dr Gupta for yet another very helpful and informative video. I have ordered Magnesium Glycinate and now realise it’s in tablets of 200mg. Is it ok to take 2? I am a female of 69 years and have developed Atrial Fibrillation over the past 4 months.
      My main concern is that I am breathless.

  8. joey 9th September 2019 at 8:43 am - Reply

    can i take magnesium if im having a lower heart rate.. i have episodes of lower heart rate to a normal heart beat.. hope u can answer me.. thank u in advance

  9. James Boslough, MD, FACEP 10th November 2019 at 9:49 pm - Reply

    In 2015 when I had a L hip replacement, the anesthesiologist told me I had a lot of PVCs during surgery and referred me to a cardiologist who did an in-office echocardiogram, EKG and thorough cardiac exam. No mention of magnesium. When we moved from MT to Colorado my new internist recommended a Holter monitor which showed a lot of PVCs including bigeminy, trigeminy and quadrigeminy. I was again referred to a cardiologist who felt the PVCs were benign but that an ablation procedure should be considered if they got more frequent or I had symptoms of SOB, CP, dizziness, light headedness or palpitations. I’ve had no symptoms with the PVCs. Interestingly, the Holter monitor showed one episode of R on T phenomena and one run of 3-beat VT. As a physician myself, I then started reading on PubMed about PVCs and started taking magnesium supplements. Within one week, my PVCs decreased remarkably and by two weeks the PVCs totally resolved and have not returned over the past 4 months I’ve been taking magnesium 500 mg per day as magnesium oxide (Walmart brand). Out of 5 doctors I’d seen about my PVCs, not one mentioned magnesium to try. Why? There’s no money in it, it’s cheap, it’s not a Rx and it’s been around forever. Listen, and listen again to Dr. Gupta’s video. He’s right on, and I’m grateful that he has gone to the trouble to make this known. I’ve already passed this video on to friends and family to educate them and have asked that they in turn pass it on. Thank you, Dr. Gupta. I can’t tell you how much I appreciate your making this more well known to the general public.

  10. Jessica 1st March 2020 at 2:13 am - Reply

    My PCP, Cardiologist as well as the Electrophysiologist all recommended magnesium oxide for my RVOT PVCs and if oxide is not a good magnesium then why was that particular one recommended?

    • ASHWIN PATEL, MRPharmS 8th February 2021 at 5:37 pm - Reply

      Magnesium oxide is not well absorbed in the GI tract and can be converted into Magnesium Hydroxide (Milk of Magnesia) which has Laxative properties. I find Magnesium Glycinate best (but any Chelated to an Amino acid Magnesium salt will work well), Magnesium Oxide preparations tend to be very cheap but useless for our purpose!

  11. ALINE P. YAP 16th April 2020 at 9:40 am - Reply

    Thank you very much for this information.

    Palpitations wake me up every 2 to 3 hours. Why is that?

  12. Christine 9th October 2020 at 3:34 pm - Reply

    Thank you! I am going to try using Magnesium. Some friends referred me to you and your videos and I am enjoying the education. Over 20 years of dealing with heart palpitations and anxiety and no one has every explained things to me like you. You are a blessing.

  13. Kathy milbourn 10th November 2020 at 8:41 pm - Reply

    If only all doctors were like you we woulid be well instead of antibiotics and pill pushing you are 1 in a million Kathy thankyou thank you 🙏

  14. Emmely Rackemann 29th November 2020 at 10:01 am - Reply

    Amazing information in this video Dr Gupta thank you for sharing such an important piece of the overall puzzle of health!! Love your holistic perspective on this and looking at nutrition, lifestyle and natural supplements first. A breath of fresh air to hear!

Leave A Comment