Immun-Ocean GASTRO EXTRA MAGNESIUM Equine Supplement for Focus and Calming

100 Days Supply for One Horse

COST PER DAY: Gastro Extra Magnesium: £1.55 / €1.65


✓ Consistent performance.

✓ Supports gastric health.

✓ Supports athletic effort & recovery times.

✓ Helps with calming.

✓ Ideal for sales preparation.


GASTRO EXTRA MAGNESIUM is a daily multifactorial gut supplement specially formulated for performance horses which suffer from stress.  It  helps to present sales horses not only looking their best, but also calm and ready to do themselves justice.

It is a 100% natural feed supplement comprising of Ascophyllum Nodosum and Lithothamnium which provides a formulated balance of vitamins and minerals. It is a natural approach to supporting the proper, efficient process of equine digestion, providing gastric and hind gut comfort.

Lithothamnium provides a rich supply of minerals including 32 trace elements. This naturally balanced mix of minerals, vitamins, amino acids and antioxidants helps to maintain a healthy immune system and gut environment and aids the overall well-being of competition horses.

Gastro Extra Magnesium contains soothing properties to help maintain intestinal health as well as a healthy balanced digestive system. Gastro Extra Magnesium encourages the growth of friendly bacteria for regular gut function, which allows the horse maximum utilisation of the feed.

The Omega 3 fatty acids in Gastro Extra Magnesium are known for their uses in supporting brain health and aiding concentration levels resulting in consistent performance. The Omega 3 fatty acids have natural soothing properties which work quickly to ease stiffness, allowing your horse to move more freely.

Natural MSM is a natural organic sulphur and is abundantly found in Ascophyllum. It helps to maintain healthy and flexible joints, offering your horse both short and long-term joint support.

With optimum levels of magnesium to help with nerve and muscle function this product contains no listed banned substances and is suitable for horses competing at all levels.

Ascophyllum Nodosum seaweed from the cold North Atlantic has been used for centuries as a natural source feed supplement, low in iodine and rich in vitamins, minerals and amino acids. It is composed of 48 elements, 16 amino acids and 11 vitamins.

The macro algae is hand harvested in accordance with traditional and sustainable methods that have been used for centuries along the Atlantic coastline of Ireland.

Lithothamnium Calcareum is a red algae belonging to the Corallinaceae family. It grows extremely slowly, giving it time to filter and absorb large quantities of sea nutrients.

Feed Gastro Extra Magnesium for total gut health and stress management.

Powered by Irish goodness for naturally healthy horses.

High performance horses
Sales preparation
Show Jumpers
Thoroughbreds for Public Sales

Immune support
Aids digestion
Allows maximum utilisation of the feed
Aids flexible joints
Helps with focus and a calm attitude

Consistent performance
Supports intestinal health
Helping with stress
Calm focused horse


GASTRO EXTRA MAGNESIUM is available in 5kg tubs (100 days supply for one horse).

1 scoop = 25g

Adult Horses = 1 Scoop twice per day mixed with regular feed.

Introduce gradually over 7/10 days.

Concentrated supplement – not to be fed ad lib. Mix well before use and store in a cool, dry place.


COMPOSITION Seaweed Meal (Ascophyllum Nodosum), Lithothamnium, Magnesium Oxide (enhanced levels 950g), Veg Oil &Fat (Flax Oil).

DIGESTIBILITY ENHANCERS Saccharomyces Cerevisiae NCYC Sc 47/CNCM I-4407 (4b1702) 1010CFU/g.

ANALYTICAL CONSTITUENTS Crude ash 62% Crude fibre 7.7% Crude protein 2.6% Crude fat 2.18% Sodium 1.41%.

These unique macro algae blends naturally contain calcium, magnesium, copper and omega 3.

Immun-Ocean Gastro does not contain any ingredient known to contravene the Jockey Club, FEI or BSJA rules. Immun-Ocean Gastro Extra Magnesium is free of all contaminants.

Note: the values listed above are typical. Components of Immun-Ocean Gastro Extra Magnesium are natural products of marine origin and as such, are subject to seasonal variation.

Customer Reviews

Based on 4 reviews
Lydia Hannon
Significant Difference

Since very limited turn out this winter, one of our horses has become stressy and tucked up. Since using the immun-ocean with added magnesium it has certainly held more condition and had a more relaxed attitude.
We’ve always used immun-ocean products and believe the horses look and perform noticeably better when on the immun-ocean supplements.

Norma Dennehy
Happy Customer

Fantastic product. Have all 6 jumping ponies on this with no need for additional supplements. Happy ponies.

Gillian Dunlop
Dunlop Sporthorses

Fantastic product, noticed remarkable difference within days of using it on two young competition mares. Their attitude, temperament and general demeanour improved significantly making them far easier to work with and settled to ride. Will be keeping this product on board for sure!!!

Ger - Showjumper Ireland

The horses look great, are less bloated and you can really feel the difference in them. We will not ever be without this product.