I have never been a big fan of collagen treatments.  They are highly temporary, and frankly unless you are actively producing more, it just fades away over short periods of time in so many ways.  So it’s not exactly the best wrinkle treatment to choose for the simple fact of it’s not long lasting.  But acne scars are a different story.  If they are indented, obviously you have a problem.  But sometimes when I’ve used one or two because I got a deal, it hasn’t been that bad for my scars.  I have more raised scars, and quite frankly, even though it’s temporary in it replacing the amounts I have, quite frankly some of the effects are not that temporary.  It replaces the damaged cells to a certain degree, and I’ve had some darker scars that have faded during that time.  The good thing is that as your body breaks it down, it doesn’t suddenly go back to dark, and it doesn’t suddenly raise up again like it did before.  So for certain acne scars, I don’t think it’s a particularly bad thing.  You have to pick and choose how you use things, and really you have to control your expectations because nothing will work the same way for everyone.  But from what I’ve seen, this works for me for that particular use.