Arginine is an amino acid produced in the body and found in many foods—especially those rich in protein. But it's also sold as a dietary supplement as L-arginine. We clear the fog of claims and counter-claims.
Grouper is a flavorful, meaty-textured fish and is well worth a trip to a fish market, because you’re unlikely to find this fish in supermarkets. If grouper isn’t available, substitute red snapper, sea bass, tilapia, or tilefish.