Freeze-drying can help in many situations with milk that tastes different after freezer storage. 9/10 moms have told us that freeze-drying improved the taste of their high lipase milk. However, it is hard to predict whether the process will for sure make the milk palatable again because it depends on how much lipase activity has already occurred in the milk, and your infant's taste preference also plays a role! The lipase enzyme can remain active during freezer storage, but it is inactivated by the freeze-drying process. For moms concerned about high-lipase, freeze-drying may stop any further lipase activity, but it cannot undo any degradation that has already occurred. If your infant refuses milk that was previously frozen, that does not necessarily mean your milk had high lipase. The freeze/thaw process is also hard on milk, and that process alone can change the quality and taste of the milk. Freeze-drying can also help in this regard, because in the freeze-drying process, water goes directly from the solid (ice) to the gas form (water vapor), bypassing the thaw step and preventing some of the changes associated with that step. If your infant refuses your frozen milk, freeze-drying may help - but we recommend doing a small 'test' batch first, if this is a concern.