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360 Tablet Tub - magnesium tablets 100mg
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100mg Strength!

Magnesium 100mg

star ratingstar ratingstar ratingstar rating  4 out of 5  | 12 product reviews
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360 Tablets - E419

Blog FAQ's


Magnesium 100mg


  • Bones and Teeth
  • Muscle Function
  • Nervous System
  • Psychological Functioning
  • Tiredness and Fatigue

Why take Magnesium Supplements?


Magnesium is the second most abundant nutrient in the body (after calcium) and is responsible for over three hundred different processes. Fifty to sixty percent is stored in bones, where it works in combination with calcium to increase density and strengthen bones and teeth. Magnesium also plays an important role in the healthy functioning of the nervous system and normal psychological function. Some people find that increasing their daily magnesium intake can reduce feelings of tiredness and fatigue.


Magnesium and Muscle Function


A key function of magnesium is healthy muscle function and contraction, including the vital muscles in the heart. Magnesium helps to balance electrolytes, which is essential for normal muscle contraction. Any imbalance in electrolytes can result in painful muscle cramping or lethargy, and for this reason, many people choose to take magnesium supplements to support healthy muscle function.


High Quality Magnesium Tablets  


Magnesium is an essential mineral that the body needs everyday. However, the body can not manufacture magnesium and so it needs to be obtained through food or supplementation. Our high-quality Magnesium tablets 100mg are the perfect way to top up your daily supply of this essential mineral. Each tablet contains 167mg of magnesium oxide, which provides 100mg of elemental (bioavailable) magnesium.


 Nutritional InformationPer tablet

 Magnesium Oxide



 ... providing elemental Magnesium 



 NRV = Nutrient Reference Value (previously referred to as RDA) 
 g = Microgramme, mg = Milligram, IU = International Units


Other Ingredients: Microcrystalline Cellulose, Magnesium Stearate.

V: Suitable for vegetarians
Free from artificial additives and preservatives
Lactose free
Wheat free
Fish free
Gluten free
Yeast free



Take two to four tablets daily as a food supplement or as directed by a healthcare professional. Store in a cool dry place. Keep away from children at all times. Do not use if the seal is broken.



If you are taking any prescription medication, you have a medical condition or you have specific concerns about the suitability of any of our products in relation to these, you should always consult your GP or Pharmacist prior to taking supplements. Pregnant or lactating women should consult a GP before taking supplements. Do not exceed the recommended daily dosage. Keep out of reach of children. Supplements should not be taken as a substitute for a varied diet. Always read the label before use.



UK Mainland


STANDARD: FREE 2-day tracked delivery for all online orders.

All orders dispatched to UK addresses will automatically qualify for FREE Standard 2 Day Delivery, regardless of order size. This means you won't be waiting long for your goods to arrive. Order before 12.30pm Monday-Friday to receive goods within 2 working days (excluding bank holidays). 


EXPRESS: FREE next-day delivery for orders over 70.

Place your order before 12.30pm Monday-Friday to receive your goods the next-working day (excluding bank holidays). For orders under 70 there is a small 5.25 charge for Express Next Day Delivery.


Track your order

All orders dispatched to UK addresses can be tracked. Simply follow the link in your dispatch confirmation email to locate your parcel. If you encounter any problems please call our freephone number 0800 988 0292 to speak to a customer service advisor.


Europe & Rest of the World

For all European and International orders, delivery charges will vary depending on the total weight and size of the order. As you add products to your basket the delivery charge will automatically update. This service offers all our international customers fair and competitive delivery charges.


Terms & Conditions

Orders must be placed before 12.30pm Monday to Friday (excluding bank holidays) to qualify for our Express Next Day Delivery or Standard 2 Day Delivery. These services are currently available for UK addresses only and are subject to stock levels. If an item(s) is out of stock, it will be given priority delivery upon arrival.


Please Note: The views expressed below are those of Simply Supplements customers. Simply Supplements does not endorse these views, nor should they be regarded as medical advice.

  • 4 stars4 stars4 stars4 stars

    Reviewed on
    18th Nov 2013
    Support against migraines 
    Richard Chesworth, Leeds
    I take these in the evening before bed and over the past four months the frequency and severity of my migraine attacks has notably reduced. The tablets arrived quickly and in excellent condition. 

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    30th Nov 2012
    Healthy bones & teeth  
    Howard Mcaffery , Kincardineshire
    I use Magnesium along with calcium supplement to help with my bones and teeth. I have them on your auto-despatch so they are sent to me automatically which is brilliant and means im never without.

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    24th Oct 2012
    All round excellance  
    Hillary Pots, Havant
    I have ordered from you for many years and your service is always brilliant no matter how big or small your query your staff are always happy to help. I have recently added this item to my auto despatch to save 10% on them

  • 4 stars4 stars4 stars4 stars

    Reviewed on
    5th Jul 2012
    help ease the cramps 
    Marvin Peterson, Waterlooville
    Recommended to me by my physiotherapist to help ease the cramps I suffer with after vigorous exercise. Can safely say it has been very succesful and will continue to use for a long time now.

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    16th May 2012
    Cramp prevention 
    Robin Vermeer, Rugby
    I take magnesium mainly for good bone health and more importantly for helping to prevent muscle cramps which I tend to experience when I'm in bed trying to sleep but they have definitely worked for me in this respect. It used to be pretty annoying for my wife when I would constantly be fidgeting around in bed but thankfully that no longer happens.

  • 4 stars4 stars4 stars4 stars

    Reviewed on
    21st Mar 2012
    Hassle Free 
    Mr Peter Jones, Colchester
    I'm a returning customer & as usual I found the website easy to use & found what I wanted straight away & at a good price.

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    7th Mar 2012
    Boris B, Keighley
    Recommended to me by a friend to help ease the regular cramps I suffer - deffo recommended to others works well!

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    17th Feb 2012
    Marion Newall, London
    After being told how much improvement a friend had gained after taking the tablets (when other ones had no effect)I ordered them for my wife to try and they have helped her a lot, she has been using them alongside calcium and magnesium. I have just made an order of twice the amount knowing that they will not go to waste.

  • 5 stars5 stars5 stars5 stars5 stars

    Reviewed on
    20th Dec 2011
    excellent service 
    Bill Paignton, Glasgow
    Quite simply this company beats all others, the quality of the products are very good, the delivery is quick, the prices are excellent and I have very little trouble ordering on the website.

  • 3 stars3 stars3 stars

    Reviewed on
    18th Mar 2009
    Smaller Boxes Please! 
    Sandra Thompson, Lincoln
    Why can't you make them so they go through the letterbox? I live just outside of Lincoln and nearly every time I have to go into the town centre just to get them from the sorting office. I know another company make them letterbox size but they are not as cheap as you are. Please make them smaller as magnesium is important for me and I need it as part of my diet.

  • 4 stars4 stars4 stars4 stars

    Reviewed on
    18th Mar 2009
    Quick Delivery  
    Maureen, Bristol
    Am chuffed to bits with your firm as after placing my order with you it arrived in 3 days. My friend ordered at the same time and she got her order 1 day after mine. Your deliveries are very fast, which is essential as I need to take these tablets everyday.

  • 4 stars4 stars4 stars4 stars

    Reviewed on
    20th Apr 2007
    MAG-nificent ! 
    Stacey Abbott, Manchetser
    I use magnesium every day and have to say yours in much better than any other I have tried, the other shops sell them at a higher price and the strength of theirs is less than yours, it is very useful and am glad that I get them at such a low price. 

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  • 18th August 2014 - Clare Hudson
    Q: Bw many tablets should you take. I have food allergy wheat gluten and sugar. Have only been taking one in the evening but what is the recommended dose ? And how do you know if you have taken too much ?
    A: The recommended daily dosage for this supplement is two to four tablets a day. You can take up to four a day, depending on your specific needs, or if you have been advised to take a particular amount by a medical professional. As long as you are not exceeding the maximum recommended dosage of four tablets a day, then you should not be taking too much. Unfortunately, depending on the individual, different symptoms can show if you have taken too much. Please be aware that we are not medically trained, therefore if you do have any specific concerns, then we do strongly suggest that you seek medical advice from your local pharmacist or GP.
  • 29th October 2013 - Midge

    I know that calcium and magnesium are often taken together. If I were to take 1 tablet per day of your magnesium, how much calcium would I need to take?


    Many health experts recommend we take calcium and magnesium in a ratio of 2:1. If you were to take one of these tablets on a daily basis (100mg in total) we would recommend that you try to consume around 200mg of Calcium. 

    You may want to consider our Magnesium 400mg and Calcium 200mg combination supplement, so that you can take beneficial levels of both nutrients in one convenient tablet. Please click HERE for more information.

  • 14th March 2013 - brian gregory
    Q: Why is your magnesium the oxide variety. I understood this is the most difficult variety for the body to handle. The citrate variety is recommended by many Doctors.

    Magnesium Oxide provides significantly higher concentrations of magnesium when compared to other types, including Magnesium Citrate. Therefore we choose to use Magnesium Oxide in our supplements.

  • 28th November 2012 - Sylvia Berlucci
    Q: If I take around 350mg-500mg Magnesium can this cause Diarrhea?

      Magnesium is often a key ingredient in many laxative medications to clear the bowel. In high quantities, magnesium may cause diarrhoea, although more than the RDA is required.

    • 7th November 2012 - lind
      Q: how small is this tablet?

      Each of our Magnesium 100mg tablets are approximately 8mm in size.

    • 11th October 2012 - CarolSwain
      Q: In June I went to the Dr about restless leg syndrome.He prescribed Pergolide 50 microgram tablets twice a day. Friends recommended your magnesium tablets.Would I be able to take these instead?

      Unfortunately, as we are not medically trained, we would advise that you consult your GP in regards to this. Our products and information are not intended to replace the attention or advice of a physician or other health care professional.


    • 4th May 2011 - Tash
      Q: Is this product safe for pregnant women?

       Pregnant or lactating women should consult a GP before taking supplements.

    • 14th September 2010 - Pauline
      Q: If I start to take magnesium will it interact with my other medication 1)Omeprozole Plus 1) Glucosomine, chondroitin and calcium capsules, 2) omega 3 capsules. 3)Ginko bilobo.4) cranberry tablets, and 5) potassium citrate.

      We are not aware of any interactions between these products, but we would advise that you consult with you local GP or pharmacist for medical advice.  

    • 27th July 2010 - Sarah Bannon
      Q: What sort of magnesium is this, gluconate, or citrate.

      Each tablet provides beneficial levels of Magnesium Oxide.

    • 7th January 2009 - Benjamin
      Q: Does this product contain Soya?

      No, this product does not contain Soya

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