Est. 1922. 100 Years (1922 - 2022) a little family goes a long way. Ultra-pasteurized. We pledge not to treat our cows with the growth hormone rBST (No significant difference has been shown between milk derived from rBST-treated and non-rBST treated cows). Pure, great-tasting milk in every pour. Shamrock Farms pure, great-tasting milk from our family of local farms is packed with protein, vitamins and wholesome goodness. And we never add the artificial growth hormones (No significant difference has been shown between milk derived from rBST-treated and non-rBST treated cows), ever. Our hands-on approach delivers a delicious difference you can taste. So pure. so fresh. So Shamrock.