SkinCeuticalsSerum 20 AOX+
1 fl. oz. for $119
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Serum 20 AOX+ is similar to the Serum 10 AOX+ from SkinCeuticals, except this pricier version increases the vitamin C content to 20%. Otherwise, the same comments apply here, too: Along with 20% vitamin C, this water-based serum contains penetration-enhancing ingredients, stabilizers, and a couple of water-binding agents. SkinCeuticals added the antioxidant ferulic acid to their vitamin C serums because research has shown it helps boost efficacy, although the only research on topical application of these antioxidants was done in part by Dr. Pinnell (Source: Journal of Investigative Dermatology, October 2005, pages 826–832), so it’s not exactly impartial. Still, there is enough research on ferulic acid’s antioxidant effects when taken internally to rationalize (and further research) its use in skin-care products.

Note: This serum is dispensed via a dropper applicator. Although not the ideal method to dispense a serum that contains light- and air-sensitive ingredients, sometimes this type of packaging is necessary due to formulary requirements. When that’s the case, the goal is to keep the bottle opening as small as possible, the bottle should be opaque or specially coated to protect the contents from light, and you should use the serum up within three months of opening.

Last Updated:03.12.2015
Jar Packaging:No
Tested on animals:Yes
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Contains L-ascorbic acid to help protect against damaging UVA/UVB rays, help prevent premature signs of aging, and help stimulate collagen production. It is lightweight, fast absorbing and optimal for normal or oily skin.


Water, L-Ascorbic acid, Ethoxydiglycol, Propylene Glycol, Glycerin, Zinc Sulfate, Phenoxyethanol, Ferulic Acid, Panthenol, Sodium Hyaluronate, Sodium Hydroxide

Brand Overview

SkinCeuticals At-A-Glance

With a strong presence in the professional (meaning spa and aesthetics) skincare market, SkinCeuticals has a mostly well-deserved reputation for producing serious-minded, research-driven products, several of which are centered on L-ascorbic acid (a form of vitamin C).

There are many good reasons to shop this line; it boasts a lineup up impressive vitamin C products, as well as some good retinol options and sunscreens. Even better is that the majority of its anti-aging products are packaged in containers that will protect their contents from light and air. Focusing on what Skinceuticals does best (which is serums, sunscreens, and specialty products) will be money well spent for visible results. The main drawbacks of this line are some products that contain fragrance ingredients, as well as potentially-drying alcohol, though they represent the minority of the brand’s offerings.

For more information about SkinCeuticals, call 1-800-771-9489 or visit www.skinceuticals.com.

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