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What's actually in NutriSource?
We re-analyzed NutriSource Adult Chicken & Rice using the current ingredient panel from nutrisourcepetfoods.com (verified 2026-04-28). The first five ingredients are chicken, chicken meal, brown rice, barley, and chicken fat (preserved with tocopherols and citric acid).
Whole chicken in the first position is the gold-standard opener — a named, whole animal protein that signals real meat content. Chicken meal at number two adds concentrated protein density (roughly three times the protein of whole chicken by weight, since the moisture has been removed). Together, those two animal proteins occupy the first two slots, with the third animal protein (menhaden fish meal) appearing further down. Brown rice and barley round out the top five — both quality, digestible whole grains that beat the corn and wheat fillers in mid-tier formulas. Shop on Amazon →
The good stuff
The animal protein lineup is strong. Whole chicken first, chicken meal second, and menhaden fish meal further down provide three named animal protein sources with complementary amino acid profiles. The fish meal is especially valuable — it brings naturally occurring marine EPA/DHA omega-3 fatty acids to the formula at the ingredient level, before any oil supplementation.
Salmon oil is added separately as a dedicated marine omega-3 source. Marine EPA and DHA are functionally important for dogs because the conversion from plant-based ALA (e.g., flaxseed) to EPA/DHA is inefficient. Pairing fish meal + salmon oil delivers both whole-food and isolated forms of the same nutrients — a more complete approach than most B-tier formulas at this price point.
The probiotic profile is unusually deep. Six named bacterial fermentation products appear on the panel: Aspergillus oryzae, Bacillus subtilis, Bacillus licheniformis, Trichoderma longibrachiatum, Enterococcus faecium, and Lactobacillus acidophilus. Most kibble formulas include zero or one probiotic strain. Six strains is a serious commitment to digestive health — it suggests the formulation team prioritized gut microbiome support, not just label-claim coverage.
Minerals are chelated throughout — zinc proteinate, iron proteinate, copper proteinate, manganese proteinate. Chelated (proteinate) forms are more bioavailable than oxide/sulfate counterparts, meaning your dog absorbs more of what's in the bowl. Selenium yeast (instead of sodium selenite) is similarly a more bioavailable selenium source.
L-carnitine supports fat metabolism and lean muscle. Taurine supports cardiac function (especially relevant given ongoing FDA discussion of grain-free DCM — NutriSource is grain-inclusive but the taurine inclusion adds belt-and-suspenders cardiac support). Yucca schidigera extract has been shown in some studies to reduce stool odor by binding ammonia in the gut. Lactic acid is a natural preservative. Mixed tocopherols (natural vitamin E) preserve the fats. No BHA/BHT/ethoxyquin.
Brown rice, barley, oatmeal, and brewers rice are all quality grains. None of the formula relies on corn, wheat, or soy — the three cheap fillers most associated with allergies and lower digestibility in dogs. The grain selection is among the cleanest in the grain-inclusive segment.
The not-so-good stuff
There are no named whole fruits or vegetables in the formula. No blueberries, sweet potatoes, carrots, or spinach. The antioxidant load comes from rosemary extract, mixed tocopherols, and L-ascorbyl-2-polyphosphate (vitamin C) — all functional, but whole-food antioxidants are a feature you'll find in some A-tier formulas like Orijen and Acana. This is a within-tier difference rather than a tier-deciding gap.
Brewers rice (a smaller-grain milling by-product of rice processing) appears further down the panel. It's nutritionally similar to white rice and not problematic, but it's a less prestigious carbohydrate source than the brown rice and barley higher up — present as a textural and cost lever rather than a nutritional contributor.
Menhaden fish meal contributes marine protein and omega-3s but isn't always sustainably sourced. Brands like Open Farm and Nulo make sustainability claims about their fish ingredients; NutriSource doesn't currently market that angle. For owners prioritizing sustainable sourcing, this is worth knowing.
How it compares
At B/78, NutriSource Adult Chicken & Rice sits in the same band as Wellness CORE (B/78) and Stella & Chewy's Freeze-Dried (B/78), a tier below Nulo FreeStyle (A/90). It ties Diamond Naturals (B/78), scores 3 points above Rachael Ray Nutrish (B/75), and 20 points above Purina ONE (C/58).
The closest stylistic comp is Fromm Gold Adult (A/90) — both grain-inclusive, both family-owned, both midwestern. Fromm clears the A-tier threshold by 12 points on whole-meat density and supplement depth; NutriSource holds an edge on probiotic strain count and the salmon-oil-plus-fish-meal omega-3 pairing, but the rubric still places Fromm a tier above. For Fromm-style midwestern grain-inclusive at a slightly lower price point, NutriSource is the value pick.
Read the full breakdown in our head-to-head comparison: NutriSource vs Natural Balance.
The bottom line
NutriSource Adult Chicken & Rice earns an B grade (78/100) from KibbleIQ. Whole chicken first, chicken meal second, marine omega-3s from both fish meal and salmon oil, six named probiotic strains, chelated minerals throughout, L-carnitine and taurine added, no corn/wheat/soy, no BHA/BHT/ethoxyquin. The lack of named whole fruits and vegetables is the main within-tier gap, but on rubric structure (whole protein first, supplement depth, no shortcut fillers) NutriSource lands solidly in the upper B tier. The 24-point jump from our prior score reflects a real manufacturer reformulation, verified against the current panel on 2026-04-28. Shop on Amazon →