Fructo-oligosaccharides (FOS)

Ingredient record found in evidence.pet/ product ingredient information. Source products linked; evidence review pending.

Ingredient Directory / Ingredient record

Ingredient record

Fructo-oligosaccharides (FOS)

“Fructo-oligosaccharides (FOS)” appears in the ingredient information of at least one indexed pet food. Preparation, inclusion amount and the rest of the formulation can differ between products.

Functional ingredientsNamed ingredientDog CatEvidence review pending

How to read this entry

We classify this term as named ingredient in the functional ingredients category. The linked products supply the observation; they do not by themselves establish the ingredient’s nutritional effect.

Check the declared form and amount, and whether any claim concerns this ingredient alone or a tested complete product.

Evidence status

This is an ingredient index entry linked to product information. We have not completed an ingredient-specific research appraisal for this entry. A term’s presence in a product does not demonstrate a health outcome, nutritional adequacy or the effect of that product.

Source and review

Product ingredient sections checked 24 September 2026. The linked product records show the wording and available source context. Manufacturer formulations and labels may change; verify the current pack and the intended market.

Research on this ingredient

Dog

FOS and MOS in dogs: digestion, microbes and immune markers

One study with 1 reviewed arm or dose connection(s).

Arm fos-supplement

FOS and MOS in dogs: digestion, microbes and immune markers

Direct · dog. Four adult female dogs with ileal cannulas; 14-day periods.

Tested form: FOS supplied at 1 g per feeding, twice daily. Dose: 1 g per feeding, twice daily (Oral feeding supplement). Duration: 14-day periods. Comparator: The same kibble without these supplements.

Measured finding: FOS-containing treatments lowered faecal indoles and phenols. Combined FOS/MOS increased ileal IgA versus control; several reported effects were only trends.

Limitations: Very small, surgically instrumented population; short periods and multiple surrogate outcomes. Related papers may share experiments.

Abstract reviewed · Checked 25 September 2026 · Evidence.pet study summary · Primary source

Protein level changes the response to FOS in dogs

One study with 1 reviewed arm or dose connection(s).

Arm fos-in-protein-factorial

Protein level changes the response to FOS in dogs

Direct · dog. 12 healthy adult dogs in a replicated four-treatment Latin square.

Tested form: Fructo-oligosaccharide (FOS) added to lower- and higher-protein foods; inclusion level not reported in the reviewed abstract. Dose: Not reported in the reviewed abstract (Food inclusion; amount not reported). Duration: 28-day periods with washouts. Comparator: Corresponding unsupplemented foods.

Measured finding: Higher protein and FOS each increased faecal ammonia. FOS increased apparent digestibility of several minerals; protein level modified some FOS effects, including bifidobacteria and protein digestibility.

Limitations: Faecal measurements are surrogate outcomes. Small healthy population; no disease-treatment endpoint.

Abstract reviewed · Checked 25 September 2026 · Evidence.pet study summary · Primary source

Products listing or mentioning this ingredient

120 products linked through reviewed ingredient occurrences from manufacturer declarations or partial editorial summaries. Whole-label verification may remain pending. An ingredient’s presence alone does not establish a nutritional outcome.

  • AATU Salmon Dry Puppy Food AATU Salmon Dry Puppy Food - Salmon Dry Puppy Food (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Akela Grain-Free Complete Wet Working Dog Food 70% Angus Beef Akela Grain-Free Complete Wet Working Dog Food 70% Angus Beef - Akela Grain-Free Complete Wet Working Dog Food 70% Angus Beef; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Akela Grain-Free Complete Wet Working Dog Food Duck & Turkey 70:30 Akela Grain-Free Complete Wet Working Dog Food Duck & Turkey 70:30 - Akela Grain-Free Complete Wet Working Dog Food Duck & Turkey 70:30; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken Adult Dry Cat Food Applaws Chicken Adult Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken Kitten Dry Cat Food Applaws Chicken Kitten Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken Senior Dry Cat Food Applaws Chicken Senior Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken With Duck Adult Dry Cat Food Applaws Chicken With Duck Adult Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken With Lamb Adult Dry Cat Food Applaws Chicken With Lamb Adult Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Chicken With Salmon Adult Dry Cat Food Applaws Chicken With Salmon Adult Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Applaws Ocean Fish with Salmon Adult Dry Cat Food Applaws Ocean Fish with Salmon Adult Dry Cat Food, editorial ingredient summary 2026-09-24; UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Adult Chicken & Rice Arden Grange Adult Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Adult Grain Free Fresh Chicken & Potato Dry Cat Food Arden Grange Adult Grain Free Fresh Chicken & Potato Dry Cat Food, UK declaration checked 2026-09-25; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Adult Lamb & Rice Arden Grange Adult Lamb & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Adult Salmon & Rice Arden Grange Adult Salmon & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Kitten Grain Free Fresh Chicken & Potato Dry Cat Food Arden Grange Kitten Grain Free Fresh Chicken & Potato Dry Cat Food, UK declaration checked 2026-09-25; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Large Breed Adult Chicken & Rice Arden Grange Large Breed Adult Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Large Breed Puppy/Junior Chicken & Rice Arden Grange Large Breed Puppy/Junior Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Light Adult Chicken & Rice Arden Grange Light Adult Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Light Grain Free Fresh Chicken & Potato Dry Cat Food Arden Grange Light Grain Free Fresh Chicken & Potato Dry Cat Food, UK declaration checked 2026-09-25; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Senior Chicken & Rice Arden Grange Senior Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Sensitive Adult Ocean White Fish & Potato Arden Grange Sensitive Adult Ocean White Fish & Potato, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Sensitive Grain Free Ocean White Fish & Potato Dry Cat Food Arden Grange Sensitive Grain Free Ocean White Fish & Potato Dry Cat Food, UK declaration checked 2026-09-25; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Sensitive Large Breed Adult Ocean White Fish & Potato Arden Grange Sensitive Large Breed Adult Ocean White Fish & Potato, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Arden Grange Sensitive Puppy/Junior Ocean White Fish & Potato Arden Grange Sensitive Puppy/Junior Ocean White Fish & Potato, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Angus Beef with Sweet Potato and Carrot Grain Free Working Dog 13.5kg Baileys Pet Foods Angus Beef with Sweet Potato and Carrot Grain Free Working Dog 13.5kg - Angus Beef with Sweet Potato and Carrot Grain Free Working Dog 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Chicken Sweet Potato and Herbs Grain Free 13.5kg Baileys Pet Foods Chicken Sweet Potato and Herbs Grain Free 13.5kg - Chicken Sweet Potato and Herbs Grain Free 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Duck, Sweet Potato and Orange Grain Free 13.5kg Baileys Pet Foods Duck, Sweet Potato and Orange Grain Free 13.5kg - Duck, Sweet Potato and Orange Grain Free 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Haddock, Sweet Potato and Parsley Grain Free 13.5kg Baileys Pet Foods Haddock, Sweet Potato and Parsley Grain Free 13.5kg - Haddock, Sweet Potato and Parsley Grain Free 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Lamb, Sweet Potato and Mint Grain Free 13.5kg Baileys Pet Foods Lamb, Sweet Potato and Mint Grain Free 13.5kg - Lamb, Sweet Potato and Mint Grain Free 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Baileys Pet Foods Tuna, Salmon, Sweet Potato and Broccoli Grain Free 13.5kg Baileys Pet Foods Tuna, Salmon, Sweet Potato and Broccoli Grain Free 13.5kg - Tuna, Salmon, Sweet Potato and Broccoli Grain Free 13.5kg; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Grain-free Senior & Light Brit Care Dog Grain-free Senior & Light - Brit Care Dog Grain-free Senior & Light; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Hypoallergenic Adult Medium Breed Brit Care Dog Hypoallergenic Adult Medium Breed - Brit Care Dog Hypoallergenic Adult Medium Breed; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Sustainable Adult Large Breed Brit Care Dog Sustainable Adult Large Breed - Brit Care Dog Sustainable Adult Large Breed; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Sustainable Adult Small Breed Brit Care Dog Sustainable Adult Small Breed - Brit Care Dog Sustainable Adult Small Breed; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Sustainable Senior Brit Care Dog Sustainable Senior - Brit Care Dog Sustainable Senior; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Brit Care Dog Sustainable Sensitive Brit Care Dog Sustainable Sensitive - Brit Care Dog Sustainable Sensitive; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Burns Puppy Original Chicken & Rice Burns Puppy Original Chicken & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Burns Puppy Original Lamb & Rice Burns Puppy Original Lamb & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Butcher’s Recovery & Revive Chicken & Rice Butcher’s Recovery & Revive Chicken & Rice - Recovery & Revive Chicken & Rice; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Butternut Box Daily Digest Butternut Box Daily Digest - Daily Digest (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Butternut Box Gut Aid Butternut Box Gut Aid - Gut Aid (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Calm & Relaxed Complete Wet Dog Food Calm & Relaxed Complete Wet Dog Food - Calm & Relaxed Complete Wet Dog Food; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Calm & Relaxed Dry Dog Food Calm & Relaxed Dry Dog Food - Calm & Relaxed Dry Dog Food; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Cooper & Co Dried Adult Dog Food Glossy Lamb with Lentils and Rosemary - 1.5kg Cooper & Co Dried Adult Dog Food Glossy Lamb with Lentils and Rosemary - 1.5kg - Cooper & Co Grain Free Glossy; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Cooper & Co Fussy Dried Adult Dog Food Salmon with Spinach and Fennel - 1.5kg Cooper & Co Fussy Dried Adult Dog Food Salmon with Spinach and Fennel - 1.5kg - Cooper & Co. Grain Free Fussy; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Cooper & Co High Energy Active Dried Adult Working Dog Food Duck with Pheasant and Spinach - 10kg Cooper & Co High Energy Active Dried Adult Working Dog Food Duck with Pheasant and Spinach - 10kg - Cooper & Co. Grain Free Active; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Dry Adult Dog Food Rich in Beef & Brown Rice Dry Adult Dog Food Rich in Beef & Brown Rice - Dry Adult Dog Food Rich in Beef & Brown Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Dry Adult Dog Food Rich in Chicken & Rice Dry Adult Dog Food Rich in Chicken & Rice - Dry Adult Dog Food Rich in Chicken & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Dry Adult Dog Food Rich in Lamb & Rice Dry Adult Dog Food Rich in Lamb & Rice - Dry Adult Dog Food Rich in Lamb & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Dry Adult Dog Food Rich in Salmon & Potato Dry Adult Dog Food Rich in Salmon & Potato - Dry Adult Dog Food Rich in Salmon & Potato; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
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