Equine America Magnitude Horse Calmer

Equine America Magnitude Horse Calmer
1kg Tub

Images are for illustration purposes only. Packaging may change from time to time and images on our website may or may not be updated.

  • 1kg Tub £24.99


Equine America Magnitude contains essential magnesium needed in the body for healthy nerve function. In magnesium deficient horses, behaviors exhibited are likely to be that of nervousness and tension, which can often have a number of detrimental effects on the overall well-being of your horse. By supplementing highly absorbable Magnitude into its daily feed, you are ensuring your horse has enough magnesium for promoting healthy nerve tissue and thus reducing nervous tension and anxiety.

Does not contravene current Jockey Club or FEI rules; it can continue to be fed whilst the horse is competing.


Magnitude - slight colour change – but the same great product, now with even more quality assurance! We are pleased to confirm that that there is no difference in the magnesium levels, or the chemical source of the magnesium used (magnesium oxide - MgO), only in the physical form of MgO we are now using.

This change in physical form (to the slightly more granular form, with a pale beige colour) has arisen because we are delighted to report that we are now manufacturing the Equine America (UK) products in the UK, using certified facilities with the highest standards of safety and production. Although Equine America (UK) products have always been free from prohibited substances, our new UFAS and BETA NOPS certifications will provide further reassurance in the light of the recent high profile prohibited substances cases, giving our customers peace of mind regarding FEI, BEF and BHA prohibited substances, enabling full traceability.

In order to comply with the rules and regulations regarding these certifications, we are only able to use certain suppliers, who are also certified, and have had to make a change to our supply of magnesium oxide, so we are now using the lower dust, slightly granular form, which is pale beige.


Magnesium Oxide.


Compounds of Trace elements - Calcium Carbonate - E170-25,000mg/kg.


  • Crude Protein - 0%
  • Crude Fibre - 0%
  • Crude Oils & Fats - 0%
  • Crude Ash - 8.00 %
  • Magnesium Oxide - 97.50%

Feeding guidelines

For an average 500 kg horse, feed 5 grams daily with the horse's regular feed. Repeat as required or as advised by a veterinary surgeon. Feed others according to body weight, less for ponies and smaller horses and more for larger breeds.

5g measuring scoop supplied.

Additional Information

FEI/Jockey Club Legal? Yes

How long will it last? (average size

horse at maintenance rate)

Approximately six months
Average cost per day? (Approx) 10p

Need help or advice? Contact us:

All prices include VAT where applicable.

Reviews (23)

Summary of Reviews for Equine America Magnitude Horse Calmer

Overall 4
Ease Of Use
Value For Money
Absence Of Side Effects
20 out of 23 (87%) customers would recommend this product.
5 stars (15 reviews)
4 stars (4 reviews)
3 stars (1 reviews)
2 stars (1 reviews)
1 stars (2 reviews)

Only verified purchasers of this product can leave a review.

55 Very good
Verified Purchase

By on 18 September 2020

Very well thought of

Customer recommends this product

45 Calmer
Verified Purchase

By on 17 May 2020

I buy this one all the time. One little scoop per day keeps him sensible

Customer recommends this product

45 Does what it says on the tub
Verified Purchase

By on 17 April 2020

Certainly seems to help

Customer recommends this product

55 It works!
Verified Purchase

By on 24 May 2019

Really pleased with this product, good value for money, only a small amount needed daily & mixes in easily in feed, the product changed recently from a white powder to a brown granules as it's now manufactured in the U.K. Still works brilliantly. I know it works for my mare because if she ever runs out I can see the difference! She is very reactive & if she gets upset or excited without magnesium she finds it very difficult to calm back down & continues to wind herself up. Not nice for either of us.

Customer recommends this product

1 person found this review helpful

Verified Purchase

By on 4 February 2019

Good value for money if it works, a waste of money it not. Did not work for my horse at all hence poor ratings.

Customer does not recommend this product

Page 1 of 5

Next Page

Q & A

Below are some recent questions we've received regarding Equine America Magnitude Horse Calmer, including answers from our team.

16 April 2022 at 4:42pm

Is this safe for a laminitic?

Beth Rice

Is this safe for a laminitic?

  • VioVet Staff

Yes this is safe to feed to a Laminitic providing your horse is not receiving further sources of Magnesium as a supplement.

20 April 2019 at 4:11pm

Change in formula


Hi there

Why has this product changed I have been using it for years as a white powder but the last tub I brought is brown and looks more like minerals?

  • VioVet Staff


Thank you for getting in touch.

As we do not manufacture this particular product we are not sure if the ingredients have been amended recently. What we have to keep in mind with these natural products is because of their active ingredients, the colour, smell and most commonly taste/texture can change as they are all naturally sourced.

Hope that helps,


9 September 2014 at 4:44pm

Mg. oxide powder


Can you ship to the USA?

  • VioVet Staff

We can ship products which are already available and approved in the USA. We cannot send products which have not been approved by your authorities as being safe. This product has of course been approved and so we can ship to the USA. We charge for delivery (normally £10) and of course you must allow for the conversion of US dollars to GP pounds when comparing prices.

Delivery Information