Type: Amino acid
Source: Synthesized or protein-derived
L-Cystine in Dog and Cat Food
L-Cystine is an amino acid formed from two cysteine molecules linked together.
Why It Appears on Pet Food Labels
It may be included to:
- Support coat structure
- Balance amino acid profiles
- Improve formula precision
Where It Is Commonly Found
- Breed-specific diets
- Skin and coat formulas
Label Context
Added amino acids help refine nutrient targets.
Educational Note
This page is part of the PetFoodDecoded Label Ingredient Library and is provided for educational reference only.