it is always tempting to take something which seem to create ‘great results’ in friends. Each body, however, has its own unique biochemistry, and I would strongly suggest that you discuss this with your physician. This is even more relevant as you are currently breast-feeding and could potentially pass those substances on to your infant.
The very fact that you are asking about effects both positive AND negative indicates to me that you have some doubts. Who knows; it may just be the greatest thing since sliced bread. If it is, I am sure your doctor will give you the green light. I would not take it on the advice of friends alone.