The claim “rBST-free” indicates milk produced without using the artificial growth hormone recombinant bovine somatotropin, or rBST. Giving this hormone to a cow boosts its milk production by about five quarts per day. Some consumers believe that treating cows with the supplemental hormone is inhumane, but the Food and Drug Administration (FDA) maintains that treating cows with rBST does not harm the animals—or significantly affect the hormone content of milk. In fact, all milks—even from cows not treated with rBST—contain naturally-occurring hormones. Note: All organic milks are rBST-free, but not all rBST-free milks are organic (i.e., farmers may use pesticides, fertilizers, etc.).