Is HR23+ hair growth supplement safe to take during pregnancy? HR23+ should not be used during pregnancy or breast feeding, mainly due to its potent additive, saw palmetto. We would advise you to only use HR23+ after your pregnancy and breast feeding. HR23+ is a safe supplement to take, free from side-effects, but we would always advise against taking saw palmetto during a period where hormones are at their highest and most unpredictable. As a precaution, use HR23+ as soon as you finish your breastfeeding.