Diet pills & breastfeeding

I know ppl say diet pills don’t work but zantrex actually helped me lose 39lbs in 2016. I recently gave birth & would like to use them again but I breastfeed. I read different things because some ppl say what we eat doesn’t affect our milk & others say it does. I will also diet & exercise but I know for a fact the pills work so I’d like to take those as well