Proximate, mineral, vitamin, amino-acid and fatty-acid analysis that verifies what your label declares — reviewed by our nutrition team, not just reported.
A guaranteed analysis is a promise to regulators, retailers and pet owners. Ingredients vary with source and season, and processing changes moisture and nutrient levels, so a recipe that is correct on paper can drift once it is made.
We verify declared values analytically through Guires Analytical Lab and qualified partner laboratories, then interpret every result against your nutrient targets and the tolerances of your market. Energy is calculated from analysed proximate values using the method each market requires.
Start your project with Guires PNLEach test is chosen for a reason — the stage of development, the format and the rules in your market.
Moisture, crude protein, crude fat, crude fibre and ash — the basis of every guaranteed analysis and of the energy calculation.
Calcium, phosphorus and their ratio, plus sodium, potassium, magnesium, zinc, copper, iron and other trace minerals.
Fat- and water-soluble vitamins, including heat-sensitive thiamine and vitamin A, measured in the finished product.
Essential amino acids (see protein analysis), taurine for cat foods and available lysine where heat processing is a concern.
Omega-6 and omega-3 profiles, including EPA and DHA, verified against label and functional claims.
Metabolisable energy calculated from analysed values with modified Atwater factors or NRC 2006 equations, as each market requires.
Declared values must hold within the tolerances regulators apply, batch after batch.
Extrusion, retort and storage reduce sensitive vitamins, so analysis is done on finished product, not on the recipe.
Calcium-to-phosphorus and omega-6-to-omega-3 ratios matter as much as single values.
Nutrient profiles are set per 1000 kcal, so an inaccurate energy value distorts every check.
Tests chosen for format, stage and market.
Sampling plan and chain of custody agreed.
Guires Analytical Lab and qualified partner labs.
Energy from analysed proximate values.
Results reviewed against targets and tolerances.
Reformulation advice where results fall short.
Peer-reviewed findings that shape how we design and interpret this work.
In a 2026 study, 82.3% of 96 products met their declared guaranteed analysis — so nearly 1 in 5 did not.
Every guarantee verified analytically before launch, with results checked against market tolerances.
Canned cat food lost 17.8% of added thiamine over six months; thiamine deficiency outbreaks have been linked to low-thiamine cat food.
Thiamine measured in finished product and during storage, not only assumed from the formula.
In moist canned cat foods, on average 48.6% of lysine had undergone early Maillard reaction.
Processing losses are allowed for in the formula and checked on pilot product.
Each application has its own page with the evidence, the actives and the claim boundaries we work within.
Lighter, more satisfying diets that help pets reach and keep a healthy weight.
A healthy skin barrier and a glossy coat, driven by the right balance of omega-6 and omega-3 fatty acids, protein quality and key micronutrients.
The right start for puppies and kittens, and the extra nutrition mothers need.
Diets that support a healthy urinary tract.
Every ingredient we choose for nutritional analysis is assessed for nutrient contribution, digestibility, processing behaviour, palatability and the rules in your market — and sourced to your specification.
Regulation updates, the latest research, recalls and market trends that shape nutritional analysis — written by our formulation, testing and regulatory teams.
No. We calculate energy from analysed proximate values using the method each market requires; we do not run feeding studies or bomb calorimetry for energy.
Analyses run through Guires Analytical Lab and qualified partner laboratories; our nutrition team reviews and interprets every result.
At launch, after any change of supplier, recipe or process, and on a routine schedule agreed with you.
Clients in the USA, UK and UAE on working with Guires PNL. Names are withheld at clients’ request.
“Their nutritional and stability testing produced documentation we could present to retailers and regulators. Having that validation in hand made our retail listing process far smoother.”
“As a small brand, independent validation of our nutritional claims was beyond our own resources. They verified our shelf life and nutrient retention and provided the data to back every claim.”
“They tested our formula under the heat and storage conditions of our region and delivered audit-ready reports. We launched knowing the product would perform exactly as specified.”
Tell us your product, your question and your market — our scientists will come back with a study design and next steps.
Every Guires PNL product is formulated to comply with the FEDIAF Nutritional Guidelines and the AAFCO Dog and Cat Food Nutrient Profiles. Neither body issues certificates to manufacturers, so compliance is verified independently against their published standards — and every product comes with a complete documentation package for regulatory submissions in the EU, US, Australia and Asian markets.
How we verify compliance →