Hi! Honestly, rosemary EO in shampoo is generally okay for topical use on your scalp, pero if you're pregnant or breastfeeding, better double-check with your OB first kasi there's conflicting info out there about essential oils during those phases. A few of us mums try it, pero we're always careful about concentrations and dilution, don't want anything too strong near our bodies during pregnancy or while nursing. If you're just using it in regular shampoo and not ingesting it, most likely it's fine, but your doctor can give you the best answer for your specific situation!