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Sanderson Magnesium FX 1000


  • 60 tablets

    RRP: NZ$27.10

    You save 49% (NZ$13.40)

  • 120 tablets

    RRP: NZ$40.90

    You save 33% (NZ$13.30)

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Magnesium Organic Ultra-Absorption FX 1000 is a high absorption complex of organic magnesium salts and does not contain inorganic magnesium oxide or phosphate, which have poor bioavailability. Magnesium FX 1000 has been formulated to include magnesium citrate, magnesium aspartate, magnesium orotate and magnesium amino acid chelate. Research has shown these organic forms are much better absorbed and are better utilised than inorganic forms. This formulation also contains vitamin B6, vitamin D and selenium as cofactors involved in the optimal absorption and utilisation of magnesium.

It is well known that some forms of minerals or other substances can be absorbed better by the body than others. The most commonly used form of magnesium in supplements is inorganic magnesium oxide (MgO), because it is cheap and because it has a high (up to 60%) elemental magnesium content. HOWEVER, the availability of the magnesium in MgO has been assessed at only around 4-5%. So a tablet boasting 500mg MgO is actually only likely to provide around 15mg magnesium. Compare this is with the availability of Magnesium Aspartate at around 42%, Magnesium Citrate at 25%, Magnesium Amino Acid Chelate at 25% or Magnesium Orotate at 20% for example. Organic forms of magnesium are better tolerated and better absorbed by the body.

Magnesium Organic Ultra-Absorption FX 1000 may be useful to support healthy heart function; muscle relaxation; sleep and relaxation; nervous system balance; PMS associated with cramps and changes in mood; anxiety, mood & irritability.



Take 1-2 tablets, or as prescribed by a healthcare professional. As magnesium may promote restful sleep it is suggested that tablets are taken in the evening.


Taking too much magnesium may lead to diarrhoea. More serious problems can develop with excessive magnesium intake from magnesium-containing laxatives. However the amounts of magnesium found in nutritional supplements are unlikely to cause such problems.

People with kidney disease should not take magnesium supplements without consulting a doctor. 

Magnesium has a range of beneficial and adverse interactions with various medications so if you are taking a medication you should check with your health professional before taking it. 


  • Magnesium Citrate (providing 70mg elemental magnesium)  451.61mg
  • Magnesium Amino Acid Chelate (providing 80mg elemental magnesium)  400mg
  • Magnesium Orotate (providing 5mg elemental magnesium)  76.92mg
  • Magnesium Aspartate (providing 5mg elemental magnesium)  66.76mg
  • (Total elemental magnesium 160mg)
  • Pyridoxine Hydrochloride  5mg
  • Selenium (as Selenomethionine)  75mcg
  • Vitamin D3 100iu

Superior Low Allergy Formulation:

Free from added sugars, yeast, starches, gluten, wheat, corn or other cereals, dairy products, colouring, preservatives, or artifical flavours.


Each Sanderson product bears the signature of Warren Sanderson, one of the original founders, and represents an assurance of quality. Their range includes: probiotics, multivitamins and homeopathic sleep supplements. They also have a range for children that includes the Smarty Fish – One-a-day, rich in omega-3 and colostrum, which may help with brain and physical development.

Superior Organic Iron is another highly reviewed product and helps with increasing deficient iron levels, which may help improve stamina levels and mental activity.

You may like to see more of our leading brands here.

Your satisfaction is of paramount importance to us! If we can help in any way please contact us using the details below.

Email: [email protected]

New Zealand Free Phone: 0800 148 148

Other Countries Phone: +64 3 524 8414

Live Chat: Between the hours of 9.30am – 4pm

You can also subscribe to the HealthPost email newsletter for all the latest news, health info and exclusive special offers. Find out more about our guarantee, payment options and delivery times, or view our FAQs page for frequently asked questions and answers.

We also highly recommend reading product reviews. They can be a great way of finding out that little bit extra about products you're interested in.

We publish all helpful customer reviews, including negative reviews - these are genuine!

Customer Reviews

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Items 1 to 10 of 32 total

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Have been taking for poor sleep Review by

Have been taking this for a month now hoping to increase my sleep and help with symptoms of fibromyalgia.
Unfortunately this product has not helped at all.

First-rate. Review by

Excellent product - has eased long-term back muscle spasm pain, and certainly promotes restful sleep.

Excellent Review by

Had previous problems getting to sleep initially and after waking in the middle of the night. This product has helped heaps:)

Sanderson FX1000 Magnesium Review by

I suffer from night cramps in my legs after every time I exercise - this NZ made product stops this from happening, one each night (whether I have exercised or not) is ideal....

sanderson magnesium Review by

It isn't quite what I wanted, but is a good alternative.
Your service is extremely good

Sleep support Review by

I have been having so much trouble sleeping because, despite having chronic fatigue (one would think I would sleep lots), I also have low Cortisol levels which can mean interrupted sleep patterns and that my sleep is not refreshing. This Magnesium supplement has helped better than others with getting to sleep and waking less, or for shorter periods of time. It's also helped with my restless legs.
Although it hasn't led to a 'cure' for my condition, it has certainly helped in a very tangible way.
Highly recommended.

Magnesium Review by

Recommended by friend for husband who constantly suffered cramp in his legs. Had not seen my husband experiencing any cramp since using the magnesium. Will continue to use.

Great product Review by

Seems to be helpful in relaxing my muscles and preventing restless leg syndrome which I often used to suffer from. It also seems to assist with sleep and keeps me on an even keel with my moods.

Great product Review by

Seems to help with my restless leg syndrome and aids in relaxation helping me to have a good nights sleep.

very good Review by

We have been using this magnesium for half a year and are happy with it.

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Product Highlights


  • healthy heart function
  • muscle relaxation
  • sleep and relaxation
  • nervous system balance
  • PMS associated with cramps and changes in mood
  • anxiety, mood & irritability.



    We Deliver Worldwide

    International orders are welcome and we offer you a choice of either Airmail or Courier delivery to best suit your needs.

    Airmail to all countries is via an untracked service.  All Courier delivery options are tracked, and tracking details will be emailed to you with your order dispatch confirmation.

    The exact delivery cost of your order will be clearly displayed for your approval during the checkout process. You can estimate the delivery cost of the goods in your cart at any stage by using our 'Postage Estimator' on the Shopping Cart Summary page.

    See our Delivery page for more information.

    Japan, Malaysia, Philippines, Singapore, South Korea, Taiwan, Thailand and Vietnam

    Airmail (5-15 working days)
    $5 first kg plus $10 per additional kg

    International Delivery Charges (all prices in NZD)


    See also dedicated site:

    Tracked Airmail (4-8 working days)
    $4.50 per order flat rate (free for orders over $79)

    Priority Courier (3-5 working days)
    $14.90 for up to 3kg, $5 per additional kg

    China including Hong Kong and Macau | 中国地区(包含香港和澳门)

    In the unlikely event you incur import tax on an order with a total value below NZD $200, HealthPost will reimburse you for the tax amount with Reward Points.

    如果您的订单被海关收税, HealthPost将报销您支付的关税(适用于价值在200纽币以下的订单)。
    偿还方式是将关税金额充值到您在HealthPost账户上的reward points里。

    Summer Special: EMS Courier Delivery | 夏日EMS 邮费优惠政策: (3-8 working days)

    Orders less than NZD $158 total: $5 per kg flat rate

    Orders over NZD $158 total and under 5kg in total weight: FREE DELIVERY

    Orders over NZD $158 total and over 5kg in total weight: first 5kg are free then $5 per additional kg

    Courier (3-8 working days)
    $10 first kg plus $5 per additional kg

    Rest of East Asia

    Airmail (5-15 working days)
    $5 first kg plus $10 per additional kg

    Courier (3-8 working days)
    $70 first kg plus $20 per additional kg

    USA, UK & Europe

    Airmail (5-15 working days)
    $10 first kg plus $10 per additional kg

    Courier (3-8 working days)
    $20 first kg plus $5 per additional kg (selected countries – see *)
    Or $70 first kg plus $20 per additional kg

    South Pacific

    Airmail (5-15 working days)
    $10 first kg plus $10 per additional kg

    Courier (3-8 working days)
    $20 first kg plus $5 per additional kg to Cook Islands, Samoa, Tonga and Vanuatu
    Or $70 first kg plus $10 per additional kg

    Rest of World

    Airmail (5-15 working days)
    $20 first kg plus $15 per additional kg

    Courier (3-8 working days)
    $30 first kg plus $10 per additional kg (selected countries – see **)
    Or $70 first kg plus $20 per additional kg

    * $20 first kg delivery to USA, UK, Europe is only available to:

    Austria, Belgium, Canada, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Romania, Slovenia, Spain, Sweden, Switzerland, United Kingdom and USA.

    ** $30 first kg delivery to Rest of World is only available to:

    Brazil, Costa Rica, Ecuador, El Salvador, Mexico and Uruguay

    Customs / Import Regulations

    Customs and import regulations vary widely between countries. Some of the products we sell via this website are prohibited for importation into certain countries. Unfortunately, it's not possible for us to be aware of all of the regulations specific to any given country. Where we are aware of any particular import restrictions, we endeavour to make note of this on the product detail page.

    HealthPost Ltd accept no liability for the refund/replacement of any goods or any costs relating to, or arising from, the importation or confiscation of any goods by your countries Customs Office or other government body. Read more about our Customs / Import Regulations Policy.

  • FREE NZ DELIVERY When You Spend Over NZ$79, Or Just $4.50 Per Order
  • EARN BONUS Reward Points With Every Order learn more

    30 Days Hassle Free Return Service

    Your satisfaction is extremely important to us. Any problems will be addressed in a friendly and efficient manner, with your total satisfaction as our over-riding concern.

    Our Return Policy

    If you have changed your mind about a product and it is in re-saleable condition (unopened, with undamaged packaging) you can return it within 30 days of receipt for a full refund.

    For more info on returns, visit our Guarantee page.

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