It works well with both, it just depends on how diligent you are with applying it :) in order for the stretch mark to fade to almost nothing you need to have that skin and the surrounding skin ULTRA moisturized, so three times daily is how often the recommended application is. However, I use this guy in the morning and sometimes at lunch time. And then i use the butter (the one in the jar) for after shower. And I am definitely not diligent and my scars have faded slightly. So if you want them gone sooner than later three times daily will do it :) Hope this helped.
Kayla B. asked, “Does this work best on new ones or old or both?”