| Inhibitor | Description and type of inhibition (with respect to L-arginine) |
| 2(S)-Amino-6-boronohexanoic acid hydrochloride hydrochloride (ABH) | A potent, specific, competitive arginase inhibitor |
| (2R)-2-amino-3-(2-boronoethylsulfanyl)propanoic acid (BEC) hydrochloride | A boronic acid-based arginine analog, which acts as a selective, slow-binding, reversible, competitive arginase inhibitor |
| NG-Hydroxy-L-arginine (NOHA) acetate salt | Intermediate in the conversion of arginine to NO and citrulline by NO synthase. Acts as reversible competitivearginase inhibitor |
| Nor-NOHA diacetate salt | More potent than a NOHA inhibitor, which exhibits 10-fold selectivity for human ARG2 over ARG1 |
| Chloroquine | Competitive arginase inhibitor |
| Piceatannol-3’-O-β-d-glucopyranoside (PG) | Competitive arginase inhibitor |
| L-ornithine | Competitive arginase inhibitor |
| L-norvaline | Non-competitive inhibitor |