PetSupplementsIndexScience-Backed Rankings

Lysine

Products Containing Lysine

Top-rated supplements featuring this ingredient, ranked by our PSI+ score.

Featheriffic Bird Supplement

Avitech

PSI+ 48.0

SmartHoof Pellets

SmartPak

PSI+ 44.0$24.95

Farnam Horseshoer's Secret Pelleted Hoof Supplement

Farnam

PSI+ 44.0$45.99

Farnam H.B. 15 Hoof Supplement

Farnam

PSI+ 41.0$39.99

PetSupplementsIndex.com — Science-Backed Pet Supplement Rankings

PetSupplementsIndex.com provides independent, science-backed rankings for over 600 pet supplements across 8 categories: Joint & Hip, Digestive Health, Skin & Coat, Multivitamin, Calming & Anxiety, Heart Health, Immune Support, and Senior Pet.

Every product is scored using our proprietary PSI+ system that evaluates ingredient adequacy, dose transparency, third-party testing, NASC certification, and real customer feedback.