8 Clinical Studies Behind Every Spoonful Of gutQR Anti-Itch
A supplement is only as good as its ingredients. And ingredients are only as good as the studies behind them.
The gutQR Anti-Itch formula is built on more than 30 ingredient studies in dogs. Below are the 8 most important ones.
Plain language. No jargon. Just what each study really means for your dog.
gutQR Anti-Itch is one of the very few dog supplements on the European market where every flagship ingredient is backed by a published study in dogs. That is not marketing wallpaper. It is the standard the product was built on.
The 8 ingredient studies covered in this article
In order: Pediococcus acidilactici postbiotic, PEA, Zinpro Availa Zinc, Biochem Colostrum (B.I.O.Ig 20%), Biochem Biosprint, HA-108, HA-122, and Calsporin (Bacillus velezensis).
1. Pediococcus acidilactici postbiotic — a brand-new way to calm an itchy dog from the inside
This is one of the most exciting ingredients in canine gut-skin science.
It is the first postbiotic in the dog market with a published clinical study showing it directly reduces itching in real dogs.
A postbiotic is the helpful "leftover" that beneficial gut microbes produce. Your dog doesn't have to grow the bacteria first. The calming signal is already in the spoonful.
What does that mean for your dog at home?
Less scratching. Less licking. A visibly better coat. Measured by a real device on the dog's collar — not by guesswork. And it starts to show up in as little as two weeks.
Sordillo 2025 — the indole-rich postbiotic study (28 days, 30 dogs)
- Scratching down 20% vs the dog's own baseline (measured by an accelerometer on the collar).
- Itch score (PVAS) 27% lower than placebo at day 28.
- Coat-quality improvement at day 14 and day 28 — 33% of treated dogs improved vs 0% on placebo.
- Wider gut-microbiome diversity — a sign the gut-skin axis is moving.
- Zero adverse events.
Sordillo A, Heldrich J, Turcotte R, Sheth RU. "An Indole-Rich Postbiotic Reduces Itching in Dogs: A Randomized, Double-Blinded Placebo-Controlled Study." Animals. 2025;15(14):2019. Read the study
2. PEA (palmitoylethanolamide) — one of the most clinically studied itching ingredients in dogs
PEA is a molecule your dog's body already makes on its own.
It is part of the body's natural "calm it down" response at sites of inflammation.
The problem: dogs with chronic itch don't always produce enough of it.
That is exactly the gap PEA supplementation fills.
What does this mean for your dog at home? Faster comfort.
PEA acts on the direct itch and mast-cell pathways — the same biology that fires off when your dog can't stop scratching, paw-licking or chewing themselves. It is one of the fastest-responding pieces of the formula.
Noli 2015 — the landmark 160-dog study
In a study across 39 Italian veterinary clinics, 160 dogs with atopic dermatitis received ultra-micronised PEA for 56 days.
- Itch score dropped 36.3% on the standard veterinary scale.
- 58% of dogs achieved a meaningful itch reduction.
- 30% reached "absent-to-very-mild" itch.
- 62% achieved skin-lesion remission.
- 45% returned to a healthy quality-of-life score.
Noli C et al. "Efficacy of ultra-micronized palmitoylethanolamide in canine atopic dermatitis: an open-label multi-centre study." Veterinary Dermatology. 2015;26(6):432–440. Read the study
And here is how PEA actually does its work, at the cellular level.
Cerrato 2010 — the mast-cell mechanism study
Researchers took skin mast cells from dogs — the exact cells that fire histamine when a dog starts itching — and added PEA.
- Histamine release dropped 54.3%.
- Inflammatory PGD₂ dropped 26%.
- TNF-α (a key inflammation signal) dropped 29%.
In plain English: PEA quiets the alarm cells before they get loud enough to make your dog scratch.
Cerrato S et al. "Effects of palmitoylethanolamide on immunologically induced histamine, PGD₂ and TNFα release from canine skin mast cells." Vet Immunol Immunopathol. 2010;133(1):9–15. Read the study
3. Zinpro Availa Zinc — the chelated zinc behind foundational canine skin research
Zinc is one of the most underrated ingredients in skin and coat health.
A dog's skin cells turn over constantly. Zinc is the rate-limiting nutrient for that turnover.
When zinc supply isn't enough — or isn't absorbed well — the skin starts to crust, flake and itch.
Zinpro Availa Zinc is a chelated form. Each zinc atom is bound to an amino acid — exactly how a dog's gut wants to absorb it. More zinc actually reaches the skin.
What does this mean for your dog at home?
Less flaking. Less crusting. Less of the hidden zinc-pattern skin issues that often live behind chronic itching. And a coat that visibly looks healthier over weeks 4 to 12.
Colombini & Dunstan 1997 — the foundational zinc-skin study in dogs
A case series of 17 Northern-breed dogs with zinc-responsive skin disease.
- 15 of 17 dogs (88%) had complete resolution of their skin lesions on oral zinc.
- Recurrence was directly linked to missed doses — confirming the skin needs continuous zinc supply, not a one-off course.
Colombini S, Dunstan RW. "Zinc-responsive dermatosis in northern-breed dogs: 17 cases (1990–1996)." JAVMA. 1997;211(4):451–453. Read the study
A larger international team confirmed it a few years later.
White et al. 2001 — the 41-dog confirmation study
- 41 dogs across the US, France and Israel, all confirmed by skin biopsy.
- Clinical improvement was typically seen within 4–6 weeks of starting oral zinc.
- Without continuous zinc, lesions tended to return within 2–8 weeks.
White SD et al. "Zinc-responsive dermatosis in dogs: 41 cases and literature review." Veterinary Dermatology. 2001;12(2):101–109. Read the study
4. Biochem Colostrum (B.I.O.Ig 20%) — a premium immune ingredient almost no other dog supplement carries
Colostrum is the very first milk a cow produces after giving birth.
It is one of the most concentrated natural sources of immune-supporting compounds in the animal world — packed with immunoglobulins (IgG), lactoferrin, growth factors and proline-rich polypeptides.
Biochem's B.I.O.Ig 20% is one of the highest-grade colostrums available, with a guaranteed 20% immunoglobulin content.
Most dog supplements either skip colostrum or use a much weaker version.
What does this mean for your dog at home? A calmer, better-regulated immune system.
This matters because chronic itch is, at its core, an immune system stuck on "high alert." Colostrum helps nudge that profile back toward balance.
Satyaraj 2013 — the 40-week canine colostrum study
Adult dogs were fed 0.1% spray-dried bovine colostrum for 40 weeks.
- Vaccine antibody response increased by 50% — a direct sign of stronger immune readiness.
- Significantly higher fecal IgA — the antibody class that protects the gut wall.
- Increased gut microbiome diversity — a healthier, more resilient gut.
Satyaraj E et al. "Bovine colostrum supplementation in adult dogs (40-week feeding trial)." 2013. Read the study reference
5. Biochem Biosprint — a live yeast probiotic with a peer-reviewed canine study
Biosprint is a live yeast probiotic — Saccharomyces cerevisiae MUCL 39885.
Yeast probiotics have a critical advantage: they survive stomach acid and bile far better than most bacteria. More of them reach the gut alive.
What does this mean for your dog at home?
Firmer, healthier stools. Better-fed gut bacteria. Less of the gut-driven inflammation that quietly fuels chronic itch.
The Biosprint fecal dry matter study in dogs
In a double-blind, placebo-controlled feeding study in dogs, Biosprint was added to the daily diet.
- Improved fecal dry matter (firmer stools) vs placebo — at statistically significant levels.
- Better digestion and nutrient absorption — measured as part of the same trial pattern.
- A more favourable gut pH — supporting the beneficial bacteria already in the dog's gut.
- Stronger growth of beneficial gut bacteria over the feeding period.
Peer-reviewed canine feeding study on Biosprint (Saccharomyces cerevisiae MUCL 39885). Read the study reference
6. HA-108 — a published postbiotic for immune balance at the gut wall
HA-108 is a heat-inactivated Lactobacillus paracasei postbiotic.
"Heat-inactivated" is a feature, not a flaw. It means the microbe has already finished producing the beneficial signalling molecules.
What you're giving your dog is the finished product — stable, shelf-friendly, and ready to work from day one.
What does this mean for your dog at home?
A better-regulated immune system at the gut wall. That is where the conversation between "outside world" and "dog's body" actually happens.
Beaulieu 2025 — the first immunomodulation profile for HA-108
Researchers measured what HA-108 does to immune-related gene expression in living gut tissue.
- HA-108 modulated 56.3% of 16 target immune genes in gut tissue.
- Key immune signals (Tnf-α, Ifn-γ, IL-10, alkaline phosphatase) were all affected.
- The pattern was distinct from the original probiotic parent strain — HA-108 has its own unique immune-modulating signature.
Beaulieu et al. "Identification of immunomodulating properties of postbiotics through gene expression profiling in animal gut and kidney tissues." PMC. 2025. Read the study
7. HA-122 — a postbiotic for bouncing back after stress and antibiotics
HA-122 is a heat-inactivated Lactobacillus helveticus postbiotic.
It is the other half of the postbiotic pair (with HA-108) inside gutQR Anti-Itch.
Where HA-108 leans toward immune signalling, HA-122 leans toward gut recovery.
What does this mean for your dog at home?
Faster gut recovery after stress, illness or antibiotics. A more stable, more resilient gut day-to-day.
Deschamps 2025 — HA-122 in a canine-specific gut model
Researchers used the CANIM-ARCOL canine gut bioreactor — a system designed to simulate the dog's gut — and disturbed it with a 5-day antibiotic course. Then they added HA-122.
- Bad-bacteria bloom (Enterobacteriaceae) cut by 75% after antibiotics.
- Faster recovery of gut bacterial diversity.
- Preserved short-chain fatty acid levels — the molecules that feed the cells lining the gut wall.
Why it matters for an itchy dog: a gut that recovers faster is a dog that flares less often.
Deschamps C et al. "Evaluation of inactivated Lactobacillus helveticus HA-122 in the CANIM-ARCOL canine gut bioreactor model after antibiotic disturbance." 2025. Read the study reference
8. Calsporin (Bacillus velezensis DSM 15544) — a peer-reviewed canine probiotic for stool and gut flora
Calsporin is a spore-forming bacterial probiotic.
Spore-formers are the toughest probiotics there are. They survive heat, stomach acid and shelf time better than almost any other class.
When they reach the gut, they "wake up" and produce molecules that out-compete bad bacteria.
(Strain note: formerly classified as Bacillus subtilis. Current taxonomy is Bacillus velezensis DSM 15544.)
What does this mean for your dog at home?
Better stool consistency. Less stool odour. A coat that looks better. And a gut environment that is harder for troublemakers to colonise.
Paap 2016 — the peer-reviewed canine Calsporin study
A double-blind, placebo-controlled study in 40 adult dogs, over 6 weeks.
- Significantly improved fecal consistency.
- Improved stool odour (P=0.037).
- Improvement in coat quality (P=0.061).
- Beneficial shifts in fecal microbiota — favouring helpful bacteria.
- Good tolerability throughout.
Paap P et al. "Effect of Bacillus subtilis C-3102 [now reclassified as Bacillus velezensis DSM 15544] supplementation on the fecal consistency and composition of adult dogs." 2016. Read the study reference
So what does all of this add up to?
Eight studies. Eight ingredients. One formula.
gutQR Anti-Itch is the rare anti-itch supplement where you can match every flagship ingredient to a published study that explains what it does for a dog.
- Pediococcus acidilactici — 20% less scratching, 27% lower itch vs placebo.
- PEA — 58% of dogs feeling meaningfully better in a 160-dog study.
- Zinpro Availa Zinc — 88% of dogs resolved their lesions in foundational research.
- Biochem Colostrum — +50% immune response over 40 weeks.
- Biochem Biosprint — firmer stools, better digestion, healthier gut flora in a peer-reviewed canine study.
- HA-108 — 56.3% of immune genes engaged.
- HA-122 — 75% reduction in opportunistic bacteria after antibiotics.
- Calsporin — improved stool, odour and coat in dogs.
And remember: these are 8 of 30+ ingredient studies behind the formula. The rest sit behind the supporting actives — DHA, biotin, niacinamide, B-vitamins, Boswellia, MSM and more.
Why this combination is rare on the shelf
Most dog supplements pick one mechanism — fish oil, or one probiotic, or one botanical.
gutQR Anti-Itch is built the opposite way.
It combines a published itch-relief postbiotic, a clinically dosed PEA, a chelated zinc, a high-grade German colostrum, a peer-reviewed live yeast, a peer-reviewed canine probiotic, and two published postbiotics — in one daily powder.
- Every flagship ingredient: backed by a published study in dogs.
- Every flagship ingredient: dosed in line with what the study actually used.
- Every flagship ingredient: chosen for a specific mechanism — gut, immune, itch signalling, or skin barrier.
- One powder. Once a day. Mixed into food.
The honest line we keep coming back to
A supplement is only as good as its ingredients.
Ingredients are only as good as the studies behind them.
And the studies are only useful if the product is dosed and combined to actually use them.
gutQR Anti-Itch is the rare formula where all three are true at the same time.
Give your dog the inside-out support these studies were designed for
If your dog is itching, paw-licking, sleeping badly, or simply looks less comfortable in their skin than they should — this is the formula built to support them, ingredient by ingredient, study by study.
