Genevieve,
Whenever I read 'normal prolactin levels' I always want to know the numbers and the management context, because a "normal" per the lab is low for lactation.

Having said that, one of the newest concerns on the horizon is zinc transporters. Shannon Kelleher (now in Boston) has seen mothers with unexplained low supply-- when they had one defective copy of a particular zinc transporter gene the production was moderately suppressed; when they had two, it was severely suppressed. We don't have ready tests for this yet so it is beyond our ability to identify at the moment, but it is out there. 

Note: more zinc is not the answer. Zinc plays many roles in the breast and in lactation, some for making milk, some for shutting the factory down. When there is a transporter problem the zinc gets sent to the wrong bucket; feeding more zinc can lead to more zinc in the wrong bucket, which could make the situation worse. 

~Lisa

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