Allies of Skin 35% Vitamin C+ Perfecting Serum Versus Revision Skincare C+ Correcting Complex 30%

Allies of Skin 35% Vitamin C+ Perfecting Serum Versus Revision Skincare C+ Correcting Complex 30%

This brightening serum is formulated around 3-O-Ethyl Ascorbic Acid and Tetrahexyldecyl Ascorbate to brighten dull-looking skin and fade the look of dark spots.

This brightening serum is formulated around Tetrahexyldecyl Ascorbate and Ergothioneine to brighten dull-looking skin and fade the look of dark spots.

What's inside

Key Ingredients

Benefits

Concerns

No concerns

Ingredients Side-by-side

Ethoxydiglycol

3-O-Ethyl Ascorbic Acid

Tetrahexyldecyl Ascorbate

Dimethyl Isosorbide

Isodecyl Neopentanoate

Glutathione

Superoxide Dismutase

Ethylhexylglycerin

Caprylyl Glycol

Phenoxyethanol

Ethoxydiglycol, 3-O-Ethyl Ascorbic Acid, Tetrahexyldecyl Ascorbate, Dimethyl Isosorbide, Isodecyl Neopentanoate, Glutathione, Superoxide Dismutase, Ethylhexylglycerin, Caprylyl Glycol, Phenoxyethanol

Water

Pentylene Glycol

Hydrolyzed Eruca Sativa Leaf

Glycerin

Zea Mays Starch

Cetearyl Glucoside

Hydrogenated Lecithin

Acetyl Zingerone

Palmitoyl Glycine

Cyclopentasiloxane

Glyceryl Caprylate

Plantago Lanceolata Leaf Extract

Diglucosyl Gallic Acid

Squalane

Sodium Carboxymethyl Beta-Glucan

Euterpe Oleracea Fruit Extract

Ergothioneine

Punica Granatum Extract

Tocopherol

Ubiquinone

Acrylates/C10-30 Alkyl Acrylate Crosspolymer

Triethanolamine

Tocopheryl Acetate

Leuconostoc/Radish Root Ferment Filtrate

Disodium EDTA

PPG-12/Smdi Copolymer

Xanthan Gum

Water, Tetrahexyldecyl Ascorbate, Pentylene Glycol, Dimethyl Isosorbide, Hydrolyzed Eruca Sativa Leaf, Glycerin, Zea Mays Starch, Cetearyl Glucoside, Hydrogenated Lecithin, Acetyl Zingerone, Palmitoyl Glycine, Cyclopentasiloxane, Glyceryl Caprylate, Plantago Lanceolata Leaf Extract, Diglucosyl Gallic Acid, Squalane, Sodium Carboxymethyl Beta-Glucan, Euterpe Oleracea Fruit Extract, Ergothioneine, Punica Granatum Extract, Tocopherol, Ubiquinone, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Triethanolamine, Tocopheryl Acetate, Leuconostoc/Radish Root Ferment Filtrate, Phenoxyethanol, Disodium EDTA, PPG-12/Smdi Copolymer, Xanthan Gum

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Alternatives

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Dimethyl Isosorbide (often shortened to DMI) is a sugar-derived solvent made from sorbitol. It's used to dissolve tricky ingredients and help them mix smoothly into a formula.

Many actives sit as gritty crystals when undissolved, so DMI swoops in to full dissolve them. This helps improve texture, stability, and how evenly an active is distributed.

It does have a penetration-enhancing reputation that is a bit more nuanced than marketing suggests; a cell study on human skin found that 10% DMI didn't significantly boost the permeation of Hydroquinone, Salicylic Acid, or Octadecenedioic Acid compared to controls (though it did improve their solubility in the formula itself).

Typical usage concentrations usually range from 1-10% depending on the formula's needs; this ingredient is also well tolerated at these levels.

Phenoxyethanol is one of the most widely used preservatives in skincare (and for good reason!).

It has a large spectrum of antimicrobial activity and especially effective bacteria, yeast, and mold while only having a weak effect on your skin's natural microbiome.

On a cellular level, it disrupts the cell membranes of microbes by poking holes that make the cell leak. This shuts down the chemical reactions the microbe needs to make energy so it can no longer survive.

Another perk of this ingredient is that it stays functional across a wide pH range (3-10).

You'll often see it paired with boosters like Ethylhexylglycerin; one study showed that a 1:9 ratio of Ethylhexylglycerin to Phenoxyethanol damages bacterial membranes as effectively as doubling the Phenoxyethanol concentration on its own.

Typical use concentrations range from 0.3-1% depending on the formula, and this ingredient is capped at 1% int the EU.

Safety-wise, the fear mongering does not hold up to the evidence. The EU's Scientific Committee on Consumer Safety and FDA consider it safe as a preservative at up to 1%, including for children of all ages.

Adverse systemic effects only showed up in animal studies at exposures roughly 200x higher than what people get from cosmetics. And despite its very widespread use, this ingredient is a rare sensitizer and allergic reactions are uncommon.

Tetrahexyldecyl Ascorbate (THD) is a stable and oil-soluble form of Vitamin C.

THD is special in that it has the ability to travel deeper into skin than traditional ascorbic acid while maintaining the same skin benefits (double win!).

Because it’s oil-soluble, THD dives deep into your skin’s fatty layers (think ceramides and cholesterol) to fight off the kind of free radicals that mess with your skin barrier. This makes it a great pair with water-based vitamin C (ascorbic acid) that mainly works on the surface.

Even at just 0.1%, THD is already showing great antioxidant activity. When used up to 2%, it helps keep your skin happy and calm, especially when it’s stressed from pollution or sun.

Want to fade dark spots or tackle hyperpigmentation? You’ll want 5% or more. Pairing it with brightening buddies like niacinamide or licorice root gives even better results. One study even used 30% THD with other brighteners and saw real results on stubborn discoloration, even in melasma-prone skin.

A note on THD: It’s has a slightly silky, oily texture and usually shows up colorless or pale yellow (though the exact shade can vary by supplier).

While you can sneak it into water-based formulas, it really shines when paired with silicones or oils, which help your skin soak it up better.

THD is pretty stable, but it’s still vulnerable to degradation like ascorbic acid. Too much light or heat (above 113°F / 45°C) can break it down over time. Go for dark and opaque packaging that keeps it safe and shady!

Read more about other types of Vitamin C:

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