Bath salts

Kate

I have been taking periodic epsom salt baths during this pregnancy to relax and help with restless leg syndrome. I am 36 weeks pregnant. I asked my hubby to get me more and he came home with Himalayan bath salt and Dead Sea bath salt. Both bags say do not use if pregnant or breastfeeding. I am very confused by this. Why would these be bad?? I tried googling it and couldn’t really find any answers. Thanks ladies!