Natural peanut butter is typically just made with either peanuts or peanuts + salt. This is typically my first choice and is a great option to decrease added sugars in your diet (plus I find it's a little more runny which is great for this dip). "Normal" or processed peanut butter will normally have added ingredients such as sugar and a few stabilizers to help avoid the natural oils in the peanut butter from seperating. This creates a slightly sweeter, more spreadable peanut butter!