Breastfeeding supplements

What are some supplements you take to increase supply !? My daughter is 2.5 week old and I feel like my supply is low. I’ve been through 3 bags of laceration cookies (and they’re getting just as expensive as formula would be) we go tomorrow for a weight check because she lost so much in the hospital and wasn’t gaining so I’m looking for something that will help with weight gain as well.

Any recommendations are helpful. I literally know nearly nothing about breast feeding