We have been asked this by a farmer. Opticell blends very well with milk and suspends in solution (to a degree), I have found that if I make the milk and leave to sit while doing other jobs, it can start to settle out. If milk+ Opticell is prepared then not feed to the calves and left to sit, it would be recommended to stir it before pouring into the feeders. This will ensure even distribution through the milk and calf herd.