It's possible because Grapeseed Extract is more like an antioxidant and made friom the same thing as grapes. Grapefruit Seed Exract is made from skin of grapefruit and is an antifungal. Although they say they both are suppose to be antifungals I think grape fruitseed extract has better healing benefits and has been really good in treating Candida and other fungal diseases. I myself will be taking it too, in fact I took grapeseed extract and thought they were the same until I did some more reading on the product, I hope it works for you too.