I have taken this DHA supplement throughout both my pregnancy and breastfeeding my baby. I prefer this DHA supplement for a number of reasons. DHA is touted to help strengthen both eye and brain development of babies, so both my OBGYN and my child's Pediatrician recommended that I take a supplement. However, my main concern for taking DHA was the source. Just like you are not allowed to eat certain types of fish while pregnant or nursing, because of mercury levels, I was concerned about the mercury levels in DHA supplements. Most DHA supplements come from fish based sources and I have read reports that some of the cheaper or lower end brands have tested high for mercury. I like that this DHA is from a vegetarian source, so I do not have to worry quite as much. My only complaint is that the dosage recommendation on the box is not as high as doctor's recommend.