Supplements for milk supply

So, I am due with baby number 3 in May. With baby number 1 I nursed for a few months but never produced enough for her to grow and ended up switching to formula. Baby number 2, I bought an SNS and kept her at the breast with formula supplement and I was able to produce about 2 oz a feeding. Dr did an exam and found that I have a severe lack of mammary glands and tissue due to my PCOS. With this baby, when she comes I plan to use the SNS again and use Fenugreek as I have with the other two, but I'm wondering if any of you have used Goats Rue? I have read several reviews and think it may be beneficial since it is supposed to grow mammary tissue. Anyone have any experience?