Supplemental amino acids
Also appears on labels as: dl-methionine, l-lysine, l-lysine monohydrochloride, l-threonine, threonine, l-tryptophan
Individual amino acids added in purified form.
Watched ingredients get highlighted on every product panel you open.
- Where it comes from
- Fermentation or synthesis.
- Why it's in the product
- Fills gaps that the protein sources left. Methionine and lysine are the two most often short in plant-heavy formulas, and methionine also acidifies urine, which is used deliberately in urinary formulas.
- Safety and toxicity
- Safe at formulated levels.
- Interactions and who should be careful
- Seeing several of these high on a panel is a hint that the protein in the food leans plant-derived, whatever the front of the bag implies.
General reference, not veterinary advice. Dose, breed, and existing conditions change the answer, so talk to your vet before changing what your pet eats. Think we got this wrong? Tell us and we log it publicly.
Found in 180 scored products
Lowest scores first. Its presence here is not what drove those scores.
156 more scored products list this ingredient. Showing the 24 lowest-scoring.