Several deodorants/anti-perspirants are made with aluminum, which has been linked to breast cancer and Alzheimer’s disease (via Teen Vogue). Some studies show that aluminum gets into the skin through nicks from shaving and since the armpit is close to the breast, it can easily travel. Most breast cancer is found in the upper quadrant of the breast where the lymph nodes are, closest to where deodorant is applied. Consequently, many people switch to natural deodorant when learning this, instead of forgoing deodorant altogether.
Scott Disick mentioned that Kourtney Kardashian was experiencing body odor from not wearing deodorant, going as far as saying she “reeks” (via Hollywood Life). He then explained that the reason she gave it up at the time was because she was breastfeeding and didn’t want to pass on harmful substances to the baby.
However, it’s a not given that you either have to use deodorant filled with hazardous chemicals or go au natural. There are so many natural versions readily on the market, and contrary to popular belief, there are natural deodorants that actually work. It does appear that Kardashian has since made the switch to wearing a natural deodorant (via InStyle). Perhaps Disick’s comments were a mediating factor in her decision.