Cosmetic Skin Solutions Supreme Serum CE

I used to be a devoted user of Cosmetic Skin Solutions CE serum that was a near dupe of Skinceuticals CE Ferulic. They stopped making it awhile ago and launched their Supreme Serum CE that they market as having a super low pH level. I didn’t want to try it because to me, super low means way way below a 3.0 and maybe even below 2.0 pH level. So I tested a sample of it and found the pH level to be pretty good. Here is the reading from my pH meter:

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Timeless 20% Vitamin C+E Ferulic Acid Serum Review

I wrote an update awhile ago that said I no longer use Paula’s Choice Vitamin C serum because it made my skin red and blotchy. It took two trips to the dermatologist to realize that is what caused my skin issues so I’ve been using the Timeless 20% Vitamin C+E Ferulic Acid Serum for the past 9-10 months. At the time, I was convinced that moving forward I was going to use Skinceuticals CE Ferulic because it is the gold standard. But, I just couldn’t bring myself to pay that much for a serum.

Mia’s review: I have no plans to stop using the Timeless 20% Vitamin C+E Ferulic Acid Serum. I haven’t experienced any irritation or skin issues during my time using it. At one point, I was concerned about the small amount of

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Paula’s Choice C15 Super Booster Review

Update  – I no longer use Paula’s Choice C15 super booster. I don’t know if they changed their ingredients or if something changed with my skin but it irritates my skin and makes it red/blotchy. I also feel a burning sensation immediately after applying it to my skin. This all began about two months ago and prior to that, I had no problems. So YMMV.


This is a stand-alone review for the Paula’s Choice C15 Super Booster. I also updated my  my post comparing several brands of Vitamin CE serum with photos of what happens when you refrigerate them.

I bought the C15 serum because my favorite Vitamin C serum was discontinued. I have a like/hate relationship with Paul’s Choice** and would prefer to use any other brand…except well, Skinceuticals is just too expensive and their patent doesn’t expire until 2025.

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Mia’s review: 

First, I have to admit that Paula’s Choice C15 Super Booster is the reason why Continue reading

Does refrigerating CE serums work?

Updated Sept 2019: Added photos at the end for Paula’s Choice C15 Super Booster comparing serum I recently opened to the serum after ~2 months of no refrigeration.

Updated May 2019: I’ve added photos at the end for Paula’s Choice C15 Super Booster.

Updated May 2018: I’ve added a photo a 4 month (120 days) photo of the Drunk Elephant C-Firma Day Serum.

Updated April 2018: I’ve added a photo comparing Drunk Elephant’s C-Firma Day Serum that has been opened for 30/60/90 days.

Updated March 2018: I’ve added photos at the end of this post of Drunk Elephant’s C-Firma Day serum that has been open for 2 months.

Updated October 2017: I’ve added photos at the end of this post of Skinceuticals CE Ferulic that was stored in the refrigerator for around 7 months.

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I’ve used SkinCeuticals CE Ferulic serum for many years and it would turn darker over time in the bottle. Because I didn’t know any better, I’d use it up until it was gone. Then, I read online that when it changes color and oxidizes you shouldn’t use it on your face. So after throwing out 1/2 of a very expensive bottle, I decided to look for cheaper alternatives.

I read that some folks had very good luck storing their serums in the fridge and taking out smaller quantities at a time to store in their bathrooms for daily use. Refrigerating the serums kept them clear over many many months. After reading that some bloggers had success with Timeless 20% C &E serum and that Timeless guarantees their product to stay fresh for 3 months, I bought it.

After using it for 6 months, I decided to stop using products with alcohol in them (fatty alcohols were the exception). My guess is that the Timeless C&E serum has such a tiny amount of alcohol in it that it doesn’t dry the skin but I wasn’t taking any chances.

I then purchased Cosmetic Skin Solutions Vitamin C & E serum because it is a duplicate for SkinCeuticals CE Ferulic serum in terms of ingredients, although the pH level is higher (although still acidic). And unlike the Timeless serum, it doesn’t include (possibly) drying alcohol as an ingredient. But, I was worried it might oxidize over time even if I kept it in the fridge.

Here are the results…

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