Thanks for your interest.
Just to make clear, are you mentioning about mango drink? mango drink is CARBS BLOCKER, not fat blocker.
If Yes, you can have them together as Mango drink blocks carbs, X-Fat burn & block fat.
If you are refering to our Apply & Peach (Fat blocker drink) vs X-Fat, then you only need to take either one as both serve to tackle fat in your food.
(Please take note that we operate only on OFFICE HOUR & WORKING DAYS as stated in our Info & Q&A page. We do not promise on replying enquiries other than our operation time, but we will try our best to fulfil whenever we can. Thanks for your understanding)