For those with lactose / dairy digestion issues, I would recommend giving this a try. Ideally you want to find whole, non homogenized A2 milk.
The milk is from selective breeding with different casein protein to make it easier to digest. It is high in potassium (500mg/serving) so don't drink 1 litre in one sitting. 2000mg of potassium would make most people repaint their toilet then think it's the milk not agreeing with them.