People pouring castor oil into their belly buttons on TikTok say the practice has cured their endometriosis, helped them lose weight, improved their complexion and given them luscious flowing locks. But you’re right to question whether there’s any science behind the viral navel-oiling trend.
Castor oil does have known impacts on the body. Due to its stimulating and laxative effects, drinking it can help treat constipation or even induce labour, though there are better and more commonly used drugs available for both of these things. The oil is also used in the manufacture of cosmetics, namely lip balms and moisturisers, thanks to its hydrating and anti-bacterial properties.
As for the claims that putting castor oil in your belly button is good for you, however, there’s not a single study that supports or, admittedly, rejects them. But that’s probably because the theory behind the idea makes no sense. It’d be like investigating whether people could meet their daily fibre needs by wearing a straw hat.