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The US Food and Drug Administration's (FDA) Feb. 14, 1994 "Interim Guidance on the Voluntary Labeling of Milk and Milk Products From Cows That Have Not Been Treated With Recombinant Bovine Somatotropin," published in the Federal Register, stated:

“FDA is concerned that the term ‘rbST-free’ may imply a compositional difference between milk from treated and untreated cows rather than a difference in the way the milk is produced… Such unqualified statements may imply that milk from untreated cows is safer or of higher quality than milk from treated cows. Such an implication would be false and misleading.

There is currently no way to differentiate analytically between naturally occurring bST and recombinant bST in milk, nor are there any measurable compositional differences between milk from cows that receive supplemental bST and milk from cows that do not.”

Feb. 14, 1994 - Interim Guidance on the Voluntary Labeling of Milk and Milk Products From Cows That Have Not Been Treated With Recombinant Bovine Somatotropin