The a2 Milk Company. Feel the difference. Easier on digestion. May help some avoid discomfort. The a2 milk difference. A2 Milk: A2 protein. Ordinary Milk: A1 protein. A2 protein. A2 Milk comes from cows that naturally produce only the natural A2 protein and no A1. Published research suggests A2 milk may help avoid stomach discomfort in some people. We love our cows! Our cows are not treated with growth hormone rBST (No significant difference has been shown between milk from rBST-treated and non rBST-treated cows). Our farms are Validus certified to ensure humane treatment. True A2 pledge. At plant number stamped above. Please recycle. recyclecartons.com.