Do I really need to use Renova or will the less expensive generic tretinoin be fine?
If your skin is fairly tough and oily, you probably would tolerate the generic just fine! Renova or Refissa are both formulated for dryer, older skin and are usually better tolerated in this situation. You must use these with a daily, high zinc sunscreen like these.
Also an option is to start with a less expensive Retinol like this one and see if you can move up to the stronger presciption forms later. This one is a 0.25% and we will be carrying a stronger 0.6 % one on the site soon.