Hi,
I never tried supplements, but really the best way to increaase supply is to nurse, nurse, nurese! By creating more demand, your breasts should create more supply.
Also make sure to eat well and stay hydrated. I have heard that having a beer can help increase it--just don't go overboard. Remember that beer-(and wine) drinking cultures have nursed their babies for centuries.....
Also contact La Leche League, their website is something like www.llli.org or maybe .com. You can call a leader for advice or attend meetings even if you are not a member. I think there is a group on the west side of Cleveland, but check the site or call 1-800-LA LECHE.
If you can manage to access past posts on this site, I am sure you will find other questions about this topic.
Are you on any meds? some of them might have an unwanted side effect of drying you up a little.
It's great that you are breastfeeding! You didn't say how old your baby is, but sometimes they go through a growth spurt and it just takes a little while for the supply and demand to equalize.
Hang in there!
K. Z.