PetSupplementsIndexScience-Backed Rankings

Amino Acids

Products Containing Amino Acids

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

Nekton-S Multi-Vitamin for Birds pet supplement

Nekton-S Multi-Vitamin for Birds

Nekton

Rep-Cal Herptivite Multivitamin pet supplement

Rep-Cal Herptivite Multivitamin

Rep-Cal

NutriBird A21 Hand Rearing Food pet supplement

NutriBird A21 Hand Rearing Food

Versele-Laga

Nekton-Rep Vitamin Supplement for Reptiles pet supplement

Nekton-Rep Vitamin Supplement for Reptiles

Nekton

Zoo Med Reptivite with D3 pet supplement

Zoo Med Reptivite with D3

Zoo Med

RenAvast Kidney Support for Cats pet supplement

RenAvast Kidney Support for Cats

RenAvast

Rx Vitamins Amino B-Plex for Cats pet supplement

Rx Vitamins Amino B-Plex for Cats

Rx Vitamins

PSI+ 44.0$21.95

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.