Methionine is a limiting amino acid in commercial swine diets and commonly supplemented as dry DL-methionine or as liquid DL-methionine. New research has been published in poultry and swine as to what the nutritional effectiveness of liquid MHA-FA relative to DL-Met is, and the reasons for this difference. DL-methionine is the feed industry standard for methionine additions. In comparison, liquid methionine is not utilized as well by the animals. This is especially evident when applying the sensitive and precise nitrogen balance technique to compare the 2 methionine sources in an animal experiment. Swine producers should only consider using liquid MHA-FA if the price does not exceed about 66% of the DL-Met price in order to maximize profitability.