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Nutrition News

Clearing up Confusion about Conventional, rbST-Free and Organic Milk

Despite Label Claims, Milks’ Composition is the Same

A study published in the July issue of the Journal of the American Dietetic Association compared three varieties of retail milk including conventional, organic and recombinant bovine somatotropin, or rbST-free milk.

More than 330 samples of milk from 48 states were tested for quality (antibiotics and bacterial counts), nutritional value (fat, protein and solids) and hormone levels (somatotropin, insulin-like growth factor-1, estradiol and progesterone).

The authors concluded that there are no meaningful differences in the composition of conventional, rbST-free or organic labeled milk in terms of measured quality, nutritional value and hormone levels. The authors also noted that food and nutrition professionals serve to communicate this accurate information to the public so consumers can make informed purchase decisions about milk based on science, not misleading marketing label claims.

Vicini J, et al. Survey of retail milk composition as affected by label claims regarding farm-management practices. Journal of the American Dietetic Association 2008;108:1198-1203.