A cat's body can build most of what it needs from raw materials. Amino acids get rearranged, fats get converted, one nutrient becomes another as required. A small handful of nutrients break that rule entirely. The body cannot make them, cannot store them for long, and has no backup pathway if the diet stops supplying them. Four ingredients in The Cat's Standard exist because of that rule.
Taurine, the one with no substitute
Taurine is the clearest case in feline nutrition. Most mammals synthesise their own taurine from other amino acids. Cats lost that ability somewhere in their evolutionary history, and the loss never got corrected because a carnivore eating whole prey never needed to correct it. Meat supplied enough.
Commercial cooking and processing change that picture. Heat degrades taurine, and a diet built around it can fall short without anyone noticing until symptoms appear, usually in the heart muscle, sometimes in the retina. The Cat's Standard adds taurine powder on top of what the meat itself contributes, because meat alone, especially after any processing, does not guarantee enough.
Salmon oil, the fat land animals do not carry
EPA and DHA are long chain omega-3 fats, and they matter for coat condition, skin barrier function, and inflammation control. Land animals do not carry these fats in meaningful amounts. Cold water fish do. Salmon oil is the formula's direct route to them, rather than relying on the cat's body to convert shorter chain plant-based omega-3s into the long chain forms it actually needs, a conversion cats do inefficiently at best.
Vitamin E, protecting the fat that's already there
Adding fat to a diet creates a new problem. Fat oxidises, and oxidised fat is not just less useful, it actively damages cells. Vitamin E is the antioxidant that protects those fats, including the salmon oil above, from breaking down before the body gets to use them. More fat in a formula means more vitamin E is needed to keep it stable.
Vitamin D3, the mineral without a switch
Chicken carcass supplies calcium. Vitamin D3 is what allows the body to actually absorb it. Without enough D3, dietary calcium passes through largely unused, regardless of how much bone is in the formula. Cats also cannot produce meaningful vitamin D3 from sunlight the way some other mammals can, which is why it has to arrive through the diet directly.
These four ingredients share a pattern. None of them are large by weight. All of them are essential regardless of size, because their absence has no workaround.
The Cat's Standard is coming soon. Formulated to exceed AAFCO, FEDIAF and NRC. 15g protein per pack, under 2% carb calories. Human grade. No grains. No fillers. See the formula when it launches.
