evidence: The salt pregnancy test is a DIY pregnancy test that requires two ingredients: salt and your urine, which you then mix together in a clear, clean bowl. Proponents of the test claim that if you’re pregnant, the salt will react with a hormone called human chorionic gonadotropin (hCG), which enters your bloodstream and urine after an embryo implants in your uterus. This is the same hormone detected in store-bought home pregnancy tests. [...] There’s no scientific explanation for how salt pregnancy tests work. Fans of the test say that hCG will react with salt, causing the mixture to curdle or change texture. But there’s zero evidence backing up that theory, and no scientific reason why salt and hCG would cause this reaction.