Step 4: Supplements
I still think that the better approach is good general nutrition: no soda, ever. Reduce caffeine and alcohol, reduce meat and sweets, eat more fruit and vegetables, avoid anything with high fructose corn syrup and prepared, processed food of any type. It's not just your skin which will feel better.
I do acknowledge that this takes a bit more money (a full home-cooked meal with fresh ingredients will cost more than a $1 box of instant cheese macaroni), but it doesn't have to take more time, just more planning. If you make a habit of going to the farmer's market and cooking large quantities on the week end you can spend most of the week eating left-overs.