Which scores higher with the experts?
Paula's Choice 10% Azelaic Acid Booster holds a Guru Score of 79%, ahead of SkinCeuticals C E Ferulic at 75%. The first draws on 20 independent expert reviews, the second on 33. On the experts' own numbers that puts 10% Azelaic Acid Booster in Approved territory and C E Ferulic in Approved.
What do the experts say about 10% Azelaic Acid Booster?
Paula's Choice 10% Azelaic Acid Booster carries a Guru Score of 79% from 20 independent experts. The formula layers beautifully and doesn't pill for most people, earning praise for its elegant texture compared to grittier azelaic acid options. Gurus consistently highlight its range: it tackles redness, acne, post-inflammatory hyperpigmentation, and even rosacea, and remains safe in pregnancy when azelaic acid alone is the concern (though the added salicylic acid introduces caution). The one genuine caveat is that azelaic acid can pill and feel less cosmetically refined, so applying it at night rather than morning works best; a few people also found the salicylic acid eventually felt like too much exfoliation alongside other actives like tretinoin, so those already using strong retinoids may want to ease in slowly or use it just once or twice a week.
What do the experts say about C E Ferulic?
SkinCeuticals C E Ferulic carries a Guru Score of 75% from 33 independent experts. This serum has solid clinical backing and delivers results for those who tolerate L-ascorbic acid well, but experts genuinely split on whether the £165-185 price tag is justified now that the original patent has expired and affordable alternatives with similar formulas exist. Those with sensitive skin or darker skin tones may find the concentration irritating and should patch-test first, as L-ascorbic acid at this strength triggers redness in a significant portion of people. For normal to dry skin types who know they handle the active well, dermatologists note it remains reliable and worth keeping; for everyone else, gurus suggest exploring cheaper dupes with the same active form before committing to the premium price.
Which should you choose?
On the experts' scores Paula's Choice 10% Azelaic Acid Booster comes out ahead, 79% to 75%, a gap of 4 points. It has 20 experts behind it against 33 for SkinCeuticals C E Ferulic. 10% Azelaic Acid Booster is most often recommended for sensitive and acne-prone skin, C E Ferulic for mature. Both are independently verified on the Guru Index, so either is a sound pick; let the use case and your budget settle it.