Thank you for your question. This would depend on the type of fragrance and the desired result. If using Essential Oils for example, you would only need a few drops to scent an 8oz bottle. If using Body Oil (again, depending on if it is a strong or light fragrance), we recommend starting with around 1 dram (4ml) and fully mixing this in before deciding if you would like to add a little more. Only add in very small increments as it is easy to add more but very difficult to fix if you add too much.