Can't find an answer-Feeding baby

I originally wanted to BF but my baby won't latch correctly even after I saw a LC. So I started pumping and at first it was great I could get 2 bottles worth in one 30 minute sitting but now I'm lucky to get 1 bottle worth in an hour. I take the supplements (fenugreek, blessed thistle) and have even up the dosage of fenugreek but nothing helps. So I have been using supplement formula.

I'm wondering if there is such thing as too much supplement? Like if I need to use a regular formula instead of a supplement formula. I do plan to keep pumping but I also want to make sure my LO is getting what is needed.