The number one thing that has helped my milk supply is WATER! 
I’ve tried the lactation cookies/bars and just didn’t get the results I expected. I have noticed that when I do not stay hydrated I produce less milk. I have made it a habit to always have a refillable water bottle with me. When I get bored of drinking just water I make sure I also keep liquid IV for flavor and for electrolytes! Now this worked for me; what has worked for you? 