Bio-Oil skincare oil improves the appearance of scars & stretch marks blend of natural plant oils and vitamins contains the unique, patented ingredient purcellin oil bio-Oil skincare oil is ireland's no. 1 selling scar & stretch mark product. Bio-Oil skincare oil's formulation combines a blend of vitamins a and e, natural plant oils and a breakthrough ingredient purcellin oil . Clinically proven to reduce the appearance of scars and stretch marks, its unique formulation is also highly effective for uneven skin tone, ageing and dehydrated skin. In clinical trials, 92% of participants showed an improvement in the appearance of their scars after eight weeks and 100% of participants showed an improvement in the appearance of their stretch marks.