Bio Oil This oil is made of vitamins and herbs, useful for reducing scars, stretch marks, wrinkles, and dryness, and evens out skin tone. It is beneficial for pregnant women, applied to stretch marks all over the body after the fourth month of pregnancy, until delivery, and after childbirth. It is also useful for scars and burns, reducing the appearance of scars and burns, and evens out skin tone if there are signs of acne or dark spots.