:I suppose you could simply state that an alternate formulation with salicylic acid is available in the UK  it isn't necessarily the only formulation in the UK, and we can't definitively conclude that it's distribution is limited to the UK only. On a related note, were you able to find reliable sources confirming the ingredients in Proactiv+? 

 :As for your proposed text, I find no COI issue with it, so I have inserted it into the article. Please check to make sure that I pasted the content correctly. I will now proceed with my review of this section: 
 :*You note that the active ingredient - benzoyl peroxide - is a "common compound used for acne treatment", but you could go into more detail by discussing its chemical role. For example, Jessica Wu's source "Feed Your Face" mentions that it kills bacteria and is anti-inflammatory. Currently, the article text focuses too much on the side effects.  
 :*"There is also an "Extra Strength" version with a 7 percent concentration..."  Is this referring to 7% benzoyl peroxide or salicylic acid? I ask only because even though the paragraph initially focused on benzoyl peroxide, salicylic acid is mentioned at the end of the sentence. 
 :*I couldn't find a "for teens" version sold on this source. Is it in there? Regardless, I don't think it's necessary to mention the Deluxe Kit and other combinations of the same products, since the sources have not considered them noteworthy.  
 :*"There are also variations in the formulation and different active ingredients in other products." I recommend changing this to something like: "Other products in the Proactiv line have different formulations and active ingredients." 
 :Overall, your new content looks good, and is a huge improvement compared to the previous version!