Hi, I use Nouvatan. This is very dependant upon each customer really based on their skin tone and desired colour. I stock 8% 12% & 20% as you can mix most percentages with these 3. I normally say a 8-10% gives a light sunkissed look, 12-14% mid range and then if they want to go darker 14%+. In my opinion there are very subtle differences between the percentages so nothing is too drastic. I love the product but am finding that for those customers that want the more fake/towie look, this product doesn't go dark enough. I may start looking for a darker brand to stock but I do love Nouvatan as it is sooo natural and my customers love this too. Hope that helps.