A 15% L-ascorbic acid vitamin C serum with ferulic acid and vitamin E, formulated to brighten skin and support collagen production.
Aqua/Water/Eau, Ascorbic Acid, Glycerin, Ethoxydiglycol, PPG-26-Buteth-26, Mannitol, Tridecapeptide-1, Palmitoyl Tripeptide-5, Ergothioneine, Sodium Hyaluronate, Pentylene Glycol, PEG-40 Hydrogenated Castor Oil, Bisabolol, Sodium Gluconate, Decylene Glycol, Ferulic Acid, Oryza Sativa (Rice) Bran Extract, Tocopherol, Polyacrylate Crosspolymer-6, 1, 2-Hexanediol, Panthenol, Sodium Phytate, Sodium Hydroxide, Citric Acid, Phenoxyethanol
Guru Score
The Guru Score: every expert's verdict on a product, in one simple number.
Under the score you'll see how many experts weighed in, or "Early verdict" while only a few have. Paid takes count for half in the score.
Guru Certified means at least 6 experts, a score of 85% or more, and almost no Nays.
How we score →Yay
10 experts · Strong agreementWhat the gurus are saying
15% L-ascorbic acid in a stable, well-formulated blend earns consistent praise from dermatologists and skincare experts for brightening and fading dark spots, though the high price and oxidation speed are genuine tradeoffs. The formula includes ferulic acid to stabilize the vitamin C, plus peptides and other antioxidants, arrives in an airless pump, and has no fragrance or denatured alcohol. The main catch: ascorbic acid can irritate sensitive skin, so those with reactivity may want to patch-test first or explore ethylated vitamin C alternatives instead. At £61 (or $55) for 20 mls, it costs more per ounce than comparable options, and the serum oxidizes faster than stabilized forms.
What they liked
What they flagged
Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.
Independent of what the gurus think, this is what the published research supports about the main active ingredients here.
Topical vitamin C is an antioxidant with reasonable evidence for dullness and uneven tone. It breaks down in light and air, so how a product is formulated and packaged matters as much as the percentage on the front.
Source: DermNet
Ingredients like these draw water into the surface layers and slow how fast it leaves. The evidence is for comfort, softness and hydration rather than for changing the structure of the skin.
Source: DermNet
Peptides are short protein fragments meant to signal repair. The evidence for them is thinner than for retinoids or vitamin C, and it varies a lot by the specific peptide, so the category is more promising than proven.
A 15% L-ascorbic acid vitamin C serum with ferulic acid and vitamin E, formulated to brighten skin and support collagen production.
Mostly yes. 9 of the 10 gurus who reviewed it give it their stamp of approval, for a Guru Score of 83%.
Paula's Choice C15 Super Booster holds a Guru Score of 83%. That is our read on how warmly the experts talk about it, based on the verdicts of 10 expert reviewers we have collected. At least one expert has named it a Top Pick in its category.
Paula's Choice C15 Super Booster is generally suited to dry skin and sensitive skin.
Lower-priced serums the gurus still rate highly, versus this mid-range pick.
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