↗ public sourceswww.abvista.com/products/progres· 5 studies, 3 independent/mixed
Evidence · moderate
The active substance is backed by 5 studies including meta-analyses; the verdict per claim below reflects what the literature actually shows, not the brochure. Strength reflects the active substance, not the brand.
What the manufacturer claims
Free
Captured from the product page, typed and attributed — the producer’s own statements, checked against the literature below.
Physiological
Supports gut integrity by downregulating enzymes that, in excess, compromise epithelial integrity.
Physiological
Beneficially modifies the intestinal microbiota, favouring butyrate producers and lactobacilli.
Performance
Improves performance, with fewer intestinal disorders and less reliance on medication.
Manufacturer’s own words — not independently verified. The ledger below gives the evidence verdict for each.
Claim ↔ evidence ledger
Verdict free · receipts in Power
Each claim against the studies on the active substance, with the funding split. Open a row for the studies behind the verdict.
Claim
Verdict
Evidence & funding
PhysiologicalSupports gut integrity by downregulating enzymes that, in excess, compromise epithel…
Supported
2 studies · 0% indep
›
Read The gut-integrity mechanism (lower MMP activity; immune modulation under challenge) is demonstrated, though the studies are manufacturer-linked.
2019
In-feed resin acids reduce matrix metalloproteinase activity in the ileal mucosa of healthy broilers without inducing major effects on the gut microbiotaPure resin acids lowered ileal-mucosa matrix metalloproteinase (MMP) activity in healthy broilers, with no major microbiota change — a direct mechanism for the gut-integrity claim.
Effect of resin acid and zinc oxide on immune status of weaned piglets challenged with E. coli lipopolysaccharideResin acid modulated the immune response of weaned piglets challenged with E. coli LPS (Guan et al., 2021, Front. Vet. Sci. 8:761742).
PhysiologicalBeneficially modifies the intestinal microbiota, favouring butyrate producers and la…
Supported
1 study · 0% indep
›
Read Resin acids raised lactobacilli in one trial, but a mechanistic study found little microbiota change in healthy birds — the microbiota effect is modest/variable.
2015
Natural resin acid-enriched composition as a modulator of intestinal microbiota and performance enhancer in broiler chickenA moderate dose of resin-acid composition positively affected broiler performance and increased ileal lactobacilli, though caecal microbiota changes did not clearly drive the performance effect.
PerformanceImproves performance, with fewer intestinal disorders and less reliance on medicatio…
Mixed
2 studies · 0% indep
›
Read Performance gains are inconsistent: the same dose improved performance in some broiler trials but not in others; benefits are clearest under challenge.
2021
Dietary resin-acid concentrate improved performance of broiler chickens and litter quality in three experimentsAcross three experiments, resin-acid concentrate improved broiler performance and litter quality — but the size of the performance effect varied between experiments.
Distribution, metabolism and recovery of resin acids in broilers fed tall-oil-fatty-acid diets (with performance context)Notes that 3 g/kg tall oil fatty acids increased bird weight in one study but had no performance effect at the same dose in two other studies; no tissue accumulation/safety concern.
Bottom line. The gut-integrity mechanism is genuinely supported: resin acids lower the matrix-metalloproteinase activity that degrades epithelial integrity, and modulate immune status under an inflammatory challenge.
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Composition
Free
● Disclosed by manufacturer
coniferous resin acidsactive phytogenic
◆ Referenced — with resolving source
None referenced with a resolving source yet.
Evidence — on the active substance
Table free · full-text in Power
Why these studies The evidence for a proprietary product is the evidence for its active substance. These are the studies (meta-analyses first) behind the verdicts above, with funding labelled.
Year
Study & effect size
Funding
Type
Access
2019
In-feed resin acids reduce matrix metalloproteinase activity in the ileal mucosa of healthy broilers without inducing major effects on the gut microbiotaPure resin acids lowered ileal-mucosa matrix metalloproteinase (MMP) activity in healthy broilers, with no major microbiota change — a direct mechanism for the gut-integrity claim.
Natural resin acid-enriched composition as a modulator of intestinal microbiota and performance enhancer in broiler chickenA moderate dose of resin-acid composition positively affected broiler performance and increased ileal lactobacilli, though caecal microbiota changes did not clearly drive the performance effect.
Dietary resin-acid concentrate improved performance of broiler chickens and litter quality in three experimentsAcross three experiments, resin-acid concentrate improved broiler performance and litter quality — but the size of the performance effect varied between experiments.
Distribution, metabolism and recovery of resin acids in broilers fed tall-oil-fatty-acid diets (with performance context)Notes that 3 g/kg tall oil fatty acids increased bird weight in one study but had no performance effect at the same dose in two other studies; no tissue accumulation/safety concern.
Effect of resin acid and zinc oxide on immune status of weaned piglets challenged with E. coli lipopolysaccharideResin acid modulated the immune response of weaned piglets challenged with E. coli LPS (Guan et al., 2021, Front. Vet. Sci. 8:761742).
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Analysis & tools
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The working map a maker won’t give you — built only from the evidence on this page. Nothing here is marketing.
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Open the analyst workbench
Dose benchmark, the independent-vs-sponsored split, the pooled meta-analysis effects, the contradictions and the gaps — all derived from the studies above.
Dose: label vs effective trial range vs EU max
Independence-of-evidence breakdown
Pooled meta-analysis effect sizes
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Dose benchmark
Label / recommended≈0.5–3 g/kg complete feed
Effective in trials0.5–3 g/kg in published trials; performance benefit (where seen) often at the upper end
EU maximumNot an additive maximum — handled as a feed material/phytogenic
Expressed on a resin-acid / tall oil fatty acid basis; doses and resin-acid content differ between products.
Functional groupFeed material / phytogenic (gut-integrity)
Discussion — grounded in the evidence
The gut-integrity mechanism is genuinely supported: resin acids lower the matrix-metalloproteinase activity that degrades epithelial integrity, and modulate immune status under an inflammatory challenge.
The microbiota benefit is more modest — lactobacilli rose in one trial, but a mechanistic study found little microbiota change in healthy birds.
Performance is the weak point: the same dose improved performance in some broiler trials but not in others, so the benefit is inconsistent and clearest under challenge.
The evidence base is almost entirely manufacturer-authored or manufacturer-funded, with no independent meta-analysis — the independent share is effectively nil.
There is no standalone EFSA additive opinion; resin acids are handled as a feed material/phytogenic, so the classification is provisional.
Where studies disagree: Performance is inconsistent: 3 g/kg tall oil fatty acids raised bird weight in one study but had no effect at the same dose in two others. A mechanistic study found resin acids reduced MMP activity but did NOT meaningfully change the microbiota in healthy birds, tempering the microbiota claim.
Gaps: Almost all of the retrieved evidence is authored or funded by the manufacturer (Hankkija/AB Vista) with academic collaborators; fully independent trials are lacking. No meta-analysis exists, and most efficacy data are in broilers/piglets — the dairy claim is not evidenced in the retrieved literature.
Manufacturer’s stated mechanism (their words): A natural resin-acid product (from coniferous trees / tall oil). Resin acids have anti-microbial, anti-inflammatory and wound-healing properties; in the gut they downregulate matrix metalloproteinases (enzymes that, in excess, degrade epithelial integrity) and shift the microbiota toward lactobacilli and butyrate producers — aiming to strengthen intestinal integrity and improve performance, especially under challenge.
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Put this beside alternatives on the same active substance (e.g. HMBi / other rumen-protected methionine), and take the data with you.
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