GutDaily

• Owner-problem phase first: 112 searches across retailers, owner forums and competitor labels. Owners who had lived through a digestive emergency wanted daily support, but powders would not stick to food and the best-loved digestive snacks contained no live organism.
• Literature pass: our AI-powered research system extracted eleven controlled rabbit trials into one dose table; our team checked the arithmetic. We chose the strain from the EU feed-additive register, so the product is legal for rabbits from day one rather than retrofitted.
• A second, stricter pass changed the concept. One small biscuit is a minor share of daily intake, so it cannot be a fibre supplement; hay does that job. Baking destroys cultures, so the live yeast goes on after baking.
• Rejected: a Lactobacillus 'restores the flora' story (Lactobacillus is not a dominant rabbit gut genus and dies in baking), an Enterococcus strain without EU rabbit authorisation, and, for now, sodium butyrate, after a liver enzyme rose in a 600-rabbit trial.

Live yeast culture (Saccharomyces cerevisiae CNCM I-4407)

The only live culture authorised for rabbits in the EU; applied after baking so it stays alive.

Mannan-oligosaccharides (yeast cell wall)

Prebiotic partner to the yeast; together they outperformed either alone in growing rabbits.

Timothy or meadow hay flour

High-fibre base, specified so the biscuit does not dilute a hay diet.

Guar gum

Binds the biscuit without starch or sugar.

Refined vegetable oil

Coating, held to an oxidation spec, that carries the live culture onto the baked biscuit.

Vanilla

Flavour cue; the only palatant we found with published rabbit data.

• In 32 weaned rabbits over 56 days, the group fed Saccharomyces cerevisiae yeast plus MOS had the best growth and feed conversion of four diets, with improved digestibility including fibre. Production rabbits; not our biscuit. [1]
• In 120 weaned rabbits of two breeds, diets with MOS gave higher final body weight and feed intake than the control diet, plus better carcass traits. Production rabbits; MOS as a feed ingredient, not our biscuit. [2]
• The only pet-rabbit study of our yeast strain was a double-blind crossover in 6 healthy rabbits. The yeast changed none of the measured gut bacteria, body weight or dropping size and weight. Small, but we disclose it. [3]

• Most evidence for this strain comes from young production rabbits; the only pet-rabbit study was small and found no effect. GutDaily has not yet been tested in animals.
• No study shows that a probiotic prevents digestive emergencies in pet rabbits. A rabbit that stops eating or passing droppings needs a vet within hours.
• The strain is authorised for rabbits in the EU. There is no species-specific evidence for it in guinea pigs or chinchillas.

1. [1]Alrajab K, Ghoorchi T, et al. 2026. Synbiotics are Better Than Probiotics and Prebiotics for Use as Nutrition in Growing Rabbits.Veterinary medicine and science · PubMed 42132366 · Free full text
2. [2]Abd El-Aziz AH, El-Kasrawy NI, et al. 2022. Growth, immunity, relative gene expression, carcass traits and economic efficiency of two rabbit breeds fed prebiotic supplemented diets.Animal biotechnology · PubMed 32734820
3. [3]Benato L, Hastie P, et al. 2014. Effects of probiotic Enterococcus faecium and Saccharomyces cerevisiae on the faecal microflora of pet rabbits.The Journal of small animal practice · PubMed 24961954

These studies tested ingredients or similar products, often in other species, not this finished product.