Paula's Choice 5% Vitamin C Sheer Moisturizer SPF 50 Versus Paula's Choice Resist Super-Light Wrinkle Defense SPF 30

Paula's Choice 5% Vitamin C Sheer Moisturizer SPF 50 Versus Paula's Choice Resist Super-Light Wrinkle Defense SPF 30

This hybrid sunscreen covers the full UV range and blocks ~98% of UVB at SPF 50.

This mineral sunscreen covers the full UV range and blocks ~97% of UVB at SPF 30.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Butyl Methoxydibenzoylmethane

Ethylhexyl Methoxycinnamate

Ethylhexyl Salicylate

Octocrylene

Water

Glycerin

Silica

3-O-Ethyl Ascorbic Acid

Ascorbyl Glucoside

Dimethicone

Propanediol

Tetrahexyldecyl Ascorbate

Acetyl Zingerone

Acrylates/C10-30 Alkyl Acrylate Crosspolymer

Diethylhexyl Syringylidenemalonate

Dimethicone/Vinyl Dimethicone Crosspolymer

Porphyra Umbilicalis Extract

Hydrogenated Lecithin

Ricinus Communis Seed Oil

Sodium Hydroxide

Tocopherol

Xanthan Gum

Ethylhexylglycerin

Laureth-4

Phenoxyethanol

Potassium Sorbate

Sodium Benzoate

Titanium Dioxide

Iron Oxides

Entada Phaseoloides Bark/Seed Extract

Butyl Methoxydibenzoylmethane, Ethylhexyl Methoxycinnamate, Ethylhexyl Salicylate, Octocrylene, Water, Glycerin, Silica, 3-O-Ethyl Ascorbic Acid, Ascorbyl Glucoside, Dimethicone, Propanediol, Tetrahexyldecyl Ascorbate, Acetyl Zingerone, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Diethylhexyl Syringylidenemalonate, Dimethicone/Vinyl Dimethicone Crosspolymer, Porphyra Umbilicalis Extract, Hydrogenated Lecithin, Ricinus Communis Seed Oil, Sodium Hydroxide, Tocopherol, Xanthan Gum, Ethylhexylglycerin, Laureth-4, Phenoxyethanol, Potassium Sorbate, Sodium Benzoate, Titanium Dioxide, Iron Oxides, Entada Phaseoloides Bark/Seed Extract

Cyclopentasiloxane

Zinc Oxide

PEG-12 Dimethicone

PEG/PPG-18/18 Dimethicone

Lauroyl Lysine

Sodium Chloride

Trihydroxystearin

Dimethicone Crosspolymer

Resveratrol

Quercetin

Epigallocatechin Gallate

Tocopheryl Acetate

Adenosine

Bisabolol

Salix Nigra Bark Extract

Punica Granatum Extract

Haematococcus Pluvialis Extract

Hydrolyzed Corn Starch

Polysorbate 80

Hydrated Silica

Triethoxycaprylylsilane

C12-15 Alkyl Benzoate

Isopropyl Titanium Triisostearate

Caprylyl Glycol

Hexylene Glycol

Water, Cyclopentasiloxane, Zinc Oxide, PEG-12 Dimethicone, PEG/PPG-18/18 Dimethicone, Lauroyl Lysine, Sodium Chloride, Trihydroxystearin, Dimethicone Crosspolymer, Resveratrol, Quercetin, Epigallocatechin Gallate, Tocopheryl Acetate, Tetrahexyldecyl Ascorbate, Adenosine, Bisabolol, Salix Nigra Bark Extract, Punica Granatum Extract, Haematococcus Pluvialis Extract, Hydrolyzed Corn Starch, Polysorbate 80, Hydrated Silica, Triethoxycaprylylsilane, C12-15 Alkyl Benzoate, Isopropyl Titanium Triisostearate, Caprylyl Glycol, Hexylene Glycol, Ethylhexylglycerin, Iron Oxides, Phenoxyethanol

Reviews

Alternatives

Ingredients Explained

These ingredients are found in both products.

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

Ethylhexylglycerin is created from glycerin. It is a multitasker ingredient that:

The CIR Expert Panel found minimal skin absorption or sensitization of any kind in a safety assessment. Though this ingredient is considered well-tolerated, a small number of cases of allergic dermatitis have been published since 2002. Just be sure to patch test if you are unsure.

Industry-reported use ranges from 8% in rinse-off products and 2% in leave-on formulations.

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:

Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.

You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!

This ingredient is a combination of red, black, and yellow iron oxide pigments. This combination of colors is usually found in foundation, because it results in a "skin" color.

The EU typically uses CI numbers for colorants when applicable, such as CI 77489. In the US, iron oxides are regulated as color additives and "iron oxides" is the most commonly used name in US cosmetic practice.

A 2021 paper looked at skincare formulations containing iron oxides and found that they reduced transmission of blue light when measured optically. In simple terms, the pigment particles helped block or scatter part of the visible light spectrum in lab testing and the authors suggest this could translate into better protection against blue-light-related skin effects.

There is also clinical and experimental research showing that tinted products containing iron oxides can reduce visible light-induced pigmentation:

Please note, whether a product reduces visible or blue light depends on things like:

In the EU's CosIng database, iron oxides are only listed as a colorant. CosIng groups ingredients by their main cosmetic role, such as colorant, preservative, or UV filter.

Though studies say iron oxides can "attenuate blue light", they're describing an optical property and not an officially recognized cosmetic function.

So CosIng isn’t contradicting the research. It’s just classifying iron oxides by what they officially are: pigments that add color.

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