The science behind our supplements

Our Founder Linda's success with improving her own gut health inspired her to learn about horse nutrition and the role of the hindgut in horses. In collaboration with leading animal and equine nutritionists Linda explored the effect that diet, mycotoxins and stress have on a horse, and in particular the horse’s gut.

She was determined to create the best possible evidence-based gut health supplement for horses in the world - to improve horses wellbeing, eliminate the need for a plethora of supplements, and save horse owners time and money.

More about our organisation

Dog gut health supplements

Next off the rank was the creation of a gut health supplement for dogs, with a proprietary blend of BIO-K9™ prebiotics, paraprobiotics and fermented postbiotics and all natural food grade ingredients. This product was warmly recieved by dog owners who gave the product 4.5/5 stars in an independent survey.

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Science-based supplements

We're not fans of following the beaten path. That's why when Linda began creating the first supplement in our range, Digestive EQ for equine gut health, she began by looking at the science. She enlisted the support of a team of scientific experts from vets to nutritionists and microbiologists.

Our supplements are backed by scientific research.

As part of our research and design phase of Digestive EQ’s development, we undertook three trials with numerous horses across various disciplines. The results were overwhelming with consistent reporting of improved condition, topline, behaviour, manure consistency, performance, appearance and the ability to cope with stress.

The initial trial was run on 17 horses - mostly Linda's - which showed significant changes, even in the horses who had been performing really well. The supplement formulation was tweaked to be even higher quality, then trialled across 40 more horses in various disciplines.

We also undertook a field study with a new set of randomly selected horses with the guidance of leading Equine Veterinarian Professor, Andrew Dart, (BVsc PHD,Dip ACVS, Dip ECVS). To measure observable outcomes, evidence was collected for weight gain, measurable health changes and palatability. Every single horse in the study showed a remarkable increase in feed conversion with some horses increasing their weekly weight gain by up to 9 times.

“It is difficult to dismiss the relationship between weight gain and the addition of this supplement” commented Prof Dart.

There was also improvement in manure consistency, coat and body condition. All the horses found Digestive EQ palatable and with a few texture adjustments, the supplement was ready for market in November 2017. With new science emerging, we updated the Digestive EQ formulation in 2022, and created a new product, Digestive RP, for horses with higher levels of grain in their diets such as racehorses and high performance horses.

Additionally, we believe that horse lovers are dedicated to finding the best equine supplements for their horses; and the hundreds of testimonials from horse owners that you will find on this site speak for themselves.

Common changes in the horses included

Better weight gain and condition
Calmer, less stressed behaviour
No more head shaking
Greater elevation in movements
Shinier, glossy coats
Better hoof quality and growth
Fussy eaters had a better appetite
Improved feed conversion (less wasted expense!)
Less scouring while travelling

Independent canine survey

Over 3 months, 15 dog owners trialled our Digestive K9 product. Many reported significant changes in two weeks, and the most common benefits were improved toileting, nicer breath, less itching and skin irritation, dogs were happier with more energy, and their coats were softer and shiny. Others reported weight loss was achieved, and anxiety and barking were reduced. These are the overall rankings.

See the canine range

Learn about gut health

We know you love your animals!

That's why we're dedicated to helping you make informed decisions about feeding your dog or horse for great gut health - to maximise performance, health, longevity - and economy!

This is why we continually work with animal health experts with PhDs in Equine Nutrition and Gut Health to create and share educational content.

See our Learn in the menu for articles, videos and fact sheets.

Changes with Digestive EQ

MetaboLize® Field Study

Poseidon Animal Health conducted a field study to test the safety, palatability, and effectiveness of MetaboLize®. This initial trial was designed by Associate Professor, Dr Melody de Latte of the Science Faculty at the Queensland University of Technology, who is an expert on disorders of metabolism and laminitis in horses. The trial was conducted directly by Poseidon Animal Health’s in-house Head Veterinarian, Dr Erin Roddy, DVM, Doctorate of Veterinary Medicine, Equine Focus, Bachelor of Science in Chemistry and Psychology. The study was performed with the prior approval of the Department of Primary Industries Secretary’s Animal Care and Ethics Committee.

Read the Trial Results

The Science behind our Supplements

Scientific Research Articles

Ingredient Name: Red Marine Algae
Included in: Digestive RP and Digestive EQ
Purpose: To increase gastric and hindgut pH to reduce the risk of gastric ulcers and hindgut acidosis. This will assist in maintaining overall gut health and calmer, safer behaviour.
68  Effect of a marine-sourced calcium on fecal pH in horses 
The effect of a natural-source mineral supplement on gastric ulceration in horses 
The influence of feeding a high calcium, algae supplement on gastric ulceration in adult horses 
The Effect of a Seaweed-Derived Calcium Supplement on Gastric Juice pH in the Horse 
Dietary-induced modulation of the hindgut microbiota is related to behavioral responses during stressful events in horses


Ingredient Name: Magnesium Hydroxide
Included in: Digestive RP, Digestive EQ and Stress Paste
Purpose: Strong acid-buffering agent to assist in maintaining a normal stomach pH and normal stomach health. This buffering agent is chosen to increase the pH of the stomach digesta and reduce the risk of 'acid burn' induced squamous gastric ulceration, especially while horses are under stressful situations such as travel or competition.
European College of Equine Internal Medicine Consensus Statement - Equine Gastric Ulcer Syndrome in Adult Horses
Effect of aluminum hydroxide/magnesium hydroxide antacid and bismuth subsalicylate on gastric pH in horses 
Efficacy of a Combination of a Unique Pectin-Lecithin Complex (Apolectol®), Live Yeast and Magnesium Hydroxide in the Prevention of EGUS and Faecal Acidosis in Thoroughbred Racehorses: A Randomised, Blinded, Placebo Controlled Clinical Trial


Ingredient Name: Magnesium Oxide
Included in: Digestive RP and Digestive EQ
Purpose: Balances the calcium to magnesium ratio to ensure proper absorption and metabolism of magnesium.
Calcium-Sensing Receptor and Magnesium 
Calcium to Magnesium Ratio Higher Than Optimal Across Age Groups (P10-100-19)


Ingredient Name: Saccharomyces Cerevisiae Prebiotic & Postbiotic
Included in: Digestive RP, Digestive EQ and Stress Paste
Purpose: To support the hindgut microbial populations and reduce the negative impact of diet or stress on the hindgut bacteria and reduce the risk of stress or diet induced dysbiosis. To increase digestion of fibre, and to reduce inflammation and reduce the negative effects of exercise. 
Effect of a preparation of Saccharomyces cerevisiae on microbial profiles and fermentation patterns in the large intestine of horses fed a high fiber or a high starch diet
Effect of transportation on fecal bacterial communities and fermentative activities in horses: Impact of Saccharomyces cerevisiae CNCM I-1077 supplementation 
Effect of Yeast Culture Supplementation on Digestibility of varying quality Forage in Mature Horses 
Dietary supplementation of Saccharomyces cerevisiae fermentation product attenuates exercise-induced stress markers in young horses 
Effect of a preparation of Saccharomyces cerevisiae on microbial profiles and fermentation patterns in the large intestine of horses fed a high fiber or a high starch diet 
Effect of transportation on fecal bacterial communities and fermentative activities in horses: Impact of Saccharomyces cerevisiae CNCM I-1077 supplementation


Ingredient Name: Carbohydrase Enzymes
Included in: Digestive RP and Digestive EQ

Purpose: To assist with small intestinal starch digestion, as increasing small intestinal starch digestion has the beneficial flow on effect of reducing starch flow into the hindgut. This helps to prevent hindgut microbial dysbiosis caused by the rapid fermentation of starch in the hindgut.
Visualization of the Anticaging Effect of Ronozyme WX Xylanase on Wheat Substrates 
Exogenous fibrolytic enzymes improve carbohydrate digestion in exercising horses 
Changes of the hindgut microbiota due to high-starch diet can be associated with behavioral stress response in horses


Ingredient Name: Phytase Enzyme
Included in: Digestive RP
Purpose: To break down phytate and prevent it from binding to and reducing the absorption of calcium, magnesium, copper, zinc and various amino acids.
Phytase in non-ruminant animal nutrition: a critical review on phytase activities in the gastrointestinal tract and influencing factors


Ingredient Name: Toxin Binder
Included in: Digestive RP and Digestive EQ

Purpose: To bind and /or deactivate harmful mycotoxins that commonly contaminate feedstuffs for horses or that commonly coexist with pastures like ryegrass and fescue and have a negative impact on horse health and behaviour.
Mycotoxins in horse feed 
Mycotoxin and Gut Microbiota Interactions 
Clinical expression of lolitrem B (perennial ryegrass) intoxication in horses 
Mycotoxin: Its Impact on Gut Health and Microbiota 
The intestinal barrier as an emerging target in the toxicological assessment of mycotoxins 
Changes in intestinal barrier functions and gut microbiota in rats exposed to zearalenone 
Impact of mycotoxins on the intestine: are mucus and microbiota new targets? 
Mycotoxin Contamination Management Tools and Efficient Strategies in Feed Industry


Ingredient Name: Threonine
Included in: Digestive EQ, Digestive RP and Stress Paste

Purpose: An essential amino acid required for maintenance of gut lining integrity and protective mucous production.
Specific roles of threonine in intestinal mucosal integrity and barrier function 
Physiological Effects of Dietary Amino Acids on Gut Health and Functions of Swine 
Dietary threonine restriction specifically reduces intestinal mucin synthesis in rats


Ingredient Name: Glutamine
Included in: Digestive RP, Digestive EQ and Stress Paste

Purpose: A conditionally essentially amino acid during periods of stress and disease. Major fuel for the small intestinal mucosa, supports normal villi, assists in maintaining normal intestinal barrier function.
Physiological Effects of Dietary Amino Acids on Gut Health and Functions of Swine 
The Role of Dietary Nutrients in Inflammatory Bowel Disease


Ingredient Name: Proline
Included in: Digestive RP, Digestive EQ and Stress Paste
Purpose: Support normal production of mucin in the gut to maintain natural protection of the gut mucosal surface. Proline is a conditionally essential amino acid that is also found in large amounts in mucin proteins (around 13% of the amino acids).
Specific amino acids increase mucin synthesis and microbiota in dextran sulfate sodium-treated rats 


Ingredient Name: Serine
Included in: Digestive RP, Digestive EQ and Stress Paste
Purpose: Support normal production of mucin in the gut to maintain natural protection of the gut mucosal surface. Mucins are also rich in Serine and research in other animals species shows that supplementation increases mucin synthesis.
Interactions of Intestinal Bacteria with Components of the Intestinal Mucus 
Mucins in Intestinal Mucosal Defense and Inflammation: Learning From Clinical and Experimental Studies


Ingredient Name: Leucine
Included in: Digestive RP and Stress Paste
Purpose: Research in other species has shown that leucine supports intestinal development, promotes cell proliferation and has a role in mucin production.
Roles of amino acids in preventing and treating intestinal diseases: recent studies with pig models


Ingredient Name: Vitamin C
Included in: Stress Paste
Purpose: While horses are able to synthesise their own Vitamin C, research has shown that stress reduces production and suggests supplementation may be beneficial.
Ascorbic acid (vitamin C) status in Icelandic horses in Iceland 
Supplementation of Ascorbic Acid in Weanling Horses Following Prolonged Transportation


Ingredient Name: Betaine
Included in: Stress Paste
Purpose: An osmolyte, used to allow cells to maintain their own individual hydration under heat stress situations. Also used to support the gut during heat stress or competition in hot conditions.
Heat stress in livestock—The role of the gut in its aetiology and a potential role for betaine in its alleviation 
Potential nutritional strategies for the amelioration or prevention of high rigor temperature in cattle – a review 
Dietary Betaine Impacts the Physiological Responses to Moderate Heat Conditions in a Dose Dependent Manner in Sheep


Ingredient Name: Natural Vitamin E 500
Included in: Stress Paste
Purpose: Antioxidant to provide protection against oxidative stress during stress and competition and to support normal immune function in horses being challenged by disease.
A Comparative Review of Vitamin E and Associated Equine Disorders


Ingredient Name: Citrus Pectin
Included in: Stress Paste
Purpose: Designed to assist the magnesium hydroxide in buffering and protecting the stomach lining from acid burn. The pectin mixed with magnesium hydroxide forms an 'alkaline slime' that will coat the stomach lining and protect it from the stomachs natural hydrochloric acid.
Efficacy of a Combination of a Unique Pectin-Lecithin Complex (Apolectol®), Live Yeast and Magnesium Hydroxide in the Prevention of EGUS and Faecal Acidosis in Thoroughbred Racehorses: A Randomised, Blinded, Placebo Controlled Clinical Trial  
Characterizing effects of feed restriction and glucagon-like peptide 2 administration on biomarkers of inflammation and intestinal morphology 
Mucus barrier, mucins and gut microbiota: the expected slimy partners?


Ingredient Name: B Vitamins 
Included in: Stress Paste, Digestive VM
Purpose: Muscle energy generation, metabolism of carbohydrates, fats and proteins, maintenance of normal muscle and nerve function, maintenance of normal appetite, maintenance of healthy skin, coat and hooves.
An Overview of Vitamin Requirements of the Domestic Horse



Meet the Experts of Poseidon

The Poseidon Animal Health team posesses a collective wealth of experience across the fields of small animal and equine veterinary work, canine and equine nutrition, horse breeding, training and competing. As dog and horse owners ourselves, we’ve seen first hand the proven benefits of targeting gut health to improve overall health, appearance, performance and recovery. This shared expertise is strengthened by a passionate commitment to helping as many animals as we can.

Our senior management team and consultants come from animal health, veterinary, pharmaceutical and education/training sectors.


B Rur. Sc (Hon1) PhD RAnNutr

Nerida has a degree in Rural Science in 1999 and a PhD in Equine Nutrition in 2004, and is a registered animal nutritionist (equine) with the Nutrition Society of Australia. Nerida founded Equilize Horse Nutrition in 2003 and as a consulting equine nutritionist she provides high level technical support to feed and supplement companies in Australia and abroad. Nerida works closely with Poseidon Equine on formulations, research and horse owner education.

Read more about Nerida


DVM - Proprietor and Head Veterinarian

Erin has always been interested in Equine Nutrition and particularly in the role that nutrition plays in Equestrian Performance and Disease. She is passionate about researching the science behind Equine Nutrition and Gut Health and the outcome different feeding strategies and practices can have on behavior, development, performance and disease.

Read more about Erin


PhD, BSc (Hons), Grad. Dip. Science Management

Dr Belinda Chapman is a microbiologist with 25 years’ experience in microbiology research, and is Director of Quantal Bioscience, an Australian research company based in Sydney and specialising in microbiology research and education. Belinda works with Poseidon Equine as a consultant to improve our understanding of the microorganisms present in the equine gut, and the effect of prebiotics on the equine gut microbiome.

Read more about Belinda


Animal Naturopathy & Pet Nutritionist 

Ruth is a lover of animals, a pet nutritionist, an animal naturopath, an energy worker and a plant based coach. Just doing her bit to help animals live a happier life.


Dr Renee graduated Vet School before adding Veterinary homeopathy, Chinese herbal medicine and nutrition as her areas of expertise, as well as critical anaesthetics, pain management and dental care. Walking the holistic veterinary path ultimately led her to open The Natural Vets with Dr Henry. Saving animals really does make her soul shine.

Read more about Renee