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Magnesium Oxide (Heavy) 900g £12.99

Product Code: 002
MAGNESIUM OXIDE (Heavy) (Mag Ox) 900g £12.99

This Magnesium Oxide (Heavy) is produced by the leading manufacturer in the UK. It is 99.2% pure (slightly purer than the light form) and has a bulk density of 0.3-0.4g/cc. It is a highly absorbent source of magnesium that is the main ingredient of many calmers on the market.

It is denser than the light form, so it easier to handle in the feed room! As it is denser, less volume will be needed in each feed although the mass will still be the same as the light form.

***Please also check out my 85% magnesium oxide***


2 grams of Magnesium Oxide per 100kg bodyweight

500kg horse would be 10 grams of Magnesium Oxide


Magnesium is often a main ingredient in commercial calming supplements. Magnesium plays an important part in nerve and muscle function. This gives magnesium its reputation for having a calming influence on equines.

Magnesium can be of particular benefit to horses during periods of strong spring/autumn grass growth, when magnesium levels are often low.

Magnesium supplementation has been advised by veterinary surgeons with excellent results both in America and the UK. The supplementation serves not only to re-balance the diet in low magnesium areas or with high cereal diets, but also to help in combating fat deposition in overweight animals (cresty necks). Magnesium is also often used to help tense, nervous, highly strung animals due to it’s involvement in the function of excitable membranes.


There are a number of reasons why magnesium intake or status may be low:

TYPE OF DIET AND MANAGEMENT – High levels of concentrate in the diet or out at grass all year

TIME OF THE YEAR – During wet periods and in the Spring and September with periods of grass growth

ENVIRONMENTAL CONDITIONS – Acidic and marshy soils

HEALTH STATUS AND BODY CONDITION – Overweight horses and ponies often have a lower magnesium status

BREED – Native breeds tend to have a lower magnesium status

STRESS – There is a greater requirement for magnesium during periods of stress

***Please Note***

The magnesium oxide can vary in density, so the guidelines for grams per spoonful may change, e.g. 5g per heaped teaspoon. Please make sure you read the label on each pack so that you are feeding the correct amount.

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