Let me start by saying that I was not impressed by Stemulation AHA Herbal Balancing Toner ($38 in the shop).
First off, I was not too fond of the packaging. I am used to and enjoy toners that I can spray directly onto my damp face. However, this toner requires cotton pads to get the product onto the skin, which is wasteful as it ends up absorbing into the cotton more than my face.
Additionally, I am East Asian with olive-toned skin, and after about a week of use, I observed that my skin had gotten darker. As I am a big advocate of wearing sunscreen year round, I can't exactly attribute this change to sun exposure.
I am in my 30s and also have acne-prone skin. My experiences have shown that products with alpha hydroxy acids (AHA) are usually a hit or miss in dealing with blemishes, and Stemulation AHA Herbal Balancing Toner happened to be a miss. Not only did the product not help my acne, it actually caused me to start breaking out.
As is probably evident, I will not be buying Stemulation AHA Herbal Banancing Toner. There is definitely a better product out there for me.