These are the Vitamin C Serums that I’ve tried that have a pH level below 6.0 (in alphabetical order by brand).

Please note that I use pH strips and they aren’t a perfect science so the pH levels noted below are estimates only and let us know if a product is on the acidic side (or not). There is also some variation between batches of products and a manufacturer may have made changes to their formula since I tested..

If I have written a review, a link to it is below. My reviews also include an ingredients list although the ingredients may be inaccurate (depending on the original source/translation) or have changed after a review was posted.

• Cosmetic Skin Solutions CE Ferulic (pH of 3.25, currently using, results of my refrigeration experiment are here)
• Drunk Elephant C-Firma Day Serum (pH of 3.3-3.5, results of my refrigeration experiment are here and also some thoughts on the serum)
• Skinceuticals CE Ferulic (pH of 2.5-3.0, results of my refrigeration experiment are here)
• Timeless Skin Care 20% C+E+Ferulic Acid Serum (pH of 2.4, results of my refrigeration experiment are here)

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