Thousands of papers have cited RNasin® Ribonuclease Inhibitors as the source of RNase protection since Promega introduced RNasin® Inhibitors over 35 years ago, making them the most trusted reagents for RNA protection. RNasin® RNase Inhibitors work by binding strongly to RNases, preventing them from degrading vulnerable RNA molecules during manipulation in the laboratory. Reliable RNase inhibitors satisfy three major criteria: 1) They protect RNA and do not introduce RNAses; 2) They are compatible with experimental conditions used in multiple applications; and 3) They work rapidly. RNAsin fulfills all of these criteria.