I only breastfeed at night because my breastmilk is not full like bfore can I drink now slimming coffee? Will it stil affect if I breastfeed at night?

Not recommended. The Slimming Coffee has other ingredients, including a controlled substance, that may pass through the breast milk to your baby. It has also been associated with heart problems. I would not recommend any type of weight loss product while you are breast feeding. Check with your doctor after you stop breast feeding to find out about safe ways to lose weight.
Slimming=less milk. Your breastmilk is not as plentiful bc you're becoming more active and taking in less water and calories. If you want to maintain, increase your water intake, since caffeine may decrease your supply. Try mother's milk tea instead!