Probiotics during breastfeeding should be fine, but honestly the hormonal acne is more of a skincare thing, a few of us tried different probiotics and none of them really helped clear skin lah, it's more about what you're using on your face! I used Mama's Choice Face Wash and Face Serum during and after pregnancy because they're safe for breastfeeding, and that made a real difference with the acne and dullness. Best to check with your doctor about which probiotic brand is best for you since there are quite a few out there, but the GKB one from what I hear is decent from other mums lah!