I'm new to this and used it for the first time on Monday. I put it on very thinly and nothing much happened. I then saw pics of people who'd obviously put it on more heavily so I did it again yesterday. I had mild tingling, nothing to write home about, and I had some improvement in my skin this morning. I'm very excited about this. If I had only mild tingling might that mean my skin tolerates it well and would it be ok to do this more frequently than the twice weekly recommendation for a bit just to get my skin kick started? I'd be curious to hear from anyone who's used it more frequently for a brief period.