There is limited evidence that lactation cookies help with breastfeeding and milk supply issues. However, there is anecdotal evidence showing that lactation cookies can have a positive impact on your feeding journey. Lactation cookies will be most effective when eaten as part of a regular feeding and pumping routine. Lactation cookies and other foods don’t replace the need to eat regular, healthy meals, but they’re a good snack that may have a positive effect on your milk supply.