Fish protein hydrolysate

Fish protein hydrolysate explained, including how it differs from fish oil and what a canine behaviour trial can and cannot tell us.

Ingredient Directory›Fish protein hydrolysate

Ingredient & nutrient profile

Fish protein hydrolysate

Fish protein broken into smaller fragments. Its role depends on the preparation, the finished food and the question being studied.

Animal ProteinDog
FPH
Fish protein hydrolysateNutritional role • Research • Practical context
SpeciesDogs: current evidence scope
ScopeIngredient and nutrient context
AssessmentInitial evidence summary
Sources checked23 September 2026
Nutritional role

What it contributes

Hydrolysis breaks protein into smaller fragments called peptides, with some free amino acids. The fish source and processing conditions influence the resulting ingredient. Protein hydrolysates can contribute nutrition and palatability, but the name alone does not specify a clinically tested formulation. [2]

Species and formulation

Read it in context

This profile currently covers canine evidence. Fish protein hydrolysate is distinct from fish oil, which is the fat fraction, and from ordinary fish meal. A product declaring fish oil, fish meal or unspecified hydrolysed animal protein is not automatically a verified match for this ingredient. [2]

Research

What the evidence shows

Titeux et al. (2021) tested fish hydrolysate together with a melon concentrate in 39 dogs over 30 days. Some behavioural patterns differed, but cortisol response and owners’ overall anxiety ratings did not show a significant treatment benefit. Because two components were tested together, the trial cannot isolate the effect of fish hydrolysate. MP Labo funded the study. [1]

Limits and safety

Before changing the diet

This short trial is not proof that fish hydrolysate treats an anxiety disorder, and it does not establish long-term safety for every preparation. Do not treat a generic hydrolysate ingredient as equivalent to a veterinary elimination diet. A diet or supplement for a dog with suspected food reactions needs to be assessed as a complete formulation. [1, 3]

Food labels

Questions worth asking

Ask which fish species and preparation are used, how much is supplied and whether the evidence tested that same preparation alone or with other ingredients. For a behaviour claim, check whether the study measured meaningful everyday improvement, not only changes during brief tests.

Connected evidence

Explore the study

Study links follow your species selection. A shared nutrient profile may discuss more than one species.

Dogs · Combination supplement · Full-text appraisalFish hydrolysate and melon concentrate for mild stress in dogsRead the study summary, methods and limitations.
Sources

References and review scope

  1. Titeux et al. (2021): fish hydrolysate plus melon concentrate trial
  2. Cabrita et al. (2024): preparation and nutritional context
  3. Matricoti and Noli (2018): a specific hydrolysed fish elimination diet

This is an initial, source-linked overview, not a systematic review or a product endorsement. Last reviewed 23 September 2026. Next planned review: 23 December 2026.

Product connections

Finding a matching product

No matching product has yet been verified in our directory for this ingredient. A similar-sounding ingredient name is not enough to confirm a match, and ingredient research does not prove the effectiveness of a finished product.

Browse dog product profiles

Looking for fish oil?

Fish oil is a different ingredient. Read the fish oil profile for its nutritional role and linked research.