Ay mama, don't worry too much, one dose of Myra E 300 won't affect your breastmilk, a few of us have taken it din and our babies were fine! Pero to be completely sure and para maktulog ka ng mahimbing tonight, best to quickly message your OB or pediatrician in the morning para ma-confirm, okay? Vitamin E is generally safe, pero better peace of mind na galing sa doctor mismo, diba?