A luxury antioxidant serum with a lipid-soluble form of vitamin C (THD ascorbate) combined with approximately 19 other antioxidants, formulated as a creamy yellow serum in an airless pump.
Aqua, Butylene Glycol, Propanediol, Ethylhexyl Olivate, Cetearyl Alcohol, Chlorogenic Acids, Niacinamide, Lauryl Lactate, Dimethyl Isosorbide, Pyrroloquinoline Quinone Allyl Ester, Hydrolyzed Sodium Hyaluronate, Glycyrrhiza Glabra Root Extract, Tetrahexyldecyl Ascorbate, Ergothioneine, Taraxacum Officinale Rhizome/Root Extract, Arabidopsis Thaliana Extract, Carnosine, Camellia Sinensis Leaf Extract, Vitis Vinifera Seed Extract, Theobroma Cacao Seed Extract, Curcuma Longa Root Extract, Olea Europaea Fruit Extract, Euterpe Oleracea Fruit Extract, Palmitoyl Tripeptide-1, Buddleja Officinalis Flower Extract, Coffea Arabica Seed Extract, Crocus Sativus Flower Extract, Superoxide Dismutase, Ubiquinone, Plankton Extract, Micrococcus Lysate, Arginine, Zingiber Officinale Root Extract, Ceramide NP, Ceramide AP, Ceramide EOP, Linoleic Acid, Linolenic Acid, Ascorbic Acid, Bisabolol
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
11 experts · Strong agreementWhat the gurus are saying
This serum earns consistent praise for its broad antioxidant complex and gentle vitamin C form that tolerates sensitive skin better than traditional ascorbic acid. The THD ascorbate is lipid-soluble and stable, making it suitable for those with rosacea or reactive skin who typically struggle with harsher vitamin C products. The creamy texture appeals to dry skin and works well without needing a separate moisturizer in the morning, though at roughly $190-$210 per bottle it's a significant investment, and dermatologists note the vitamin C concentration itself isn't disclosed on the label.
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
Niacinamide has evidence behind it for redness, uneven tone and supporting the skin barrier, and it is usually well tolerated even by skin that reacts to most things.
Source: DermNet
Ceramides are part of the skin's own barrier, and moisturisers built around them have evidence for holding water in and settling the tightness and flaking that come with a damaged barrier.
Source: DermNet
A luxury antioxidant serum with a lipid-soluble form of vitamin C (THD ascorbate) combined with approximately 19 other antioxidants, formulated as a creamy yellow serum in an airless pump.
Mostly yes. 10 of the 11 gurus who reviewed it give it their stamp of approval, for a Guru Score of 86%.
SkinBetter Science Alto Advanced Defense and Repair Serum holds a Guru Score of 86%. That is our read on how warmly the experts talk about it, based on the verdicts of 11 expert reviewers we have collected. It is also Guru Certified, our mark for products that hold broad approval across many expert reviewers.
Lower-priced serums the gurus still rate highly, versus this luxury pick.
See how they stack up →Other products the same gurus have weighed in on, plus more from this brand and category.
Compare side by side →Stories where our editors dug into this product or its brand.
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