Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum Versus First Aid Beauty Dark Spot Serum With Niacinamide

Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum Versus First Aid Beauty Dark Spot Serum With Niacinamide

This oil-control serum is formulated around Niacinamide to balance excess oil and refine the look of pores.

This brightening serum is formulated around Niacinamide and Glycyrrhiza Glabra Root Extract to fade the look of dark spots and brighten dull-looking skin.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Niacinamide

Glycerin

Propanediol

Methyl Gluceth-20

Hydroxyacetophenone

Sodium Hyaluronate

Caprylyl Glycol

Carbomer

Sodium Hydroxide

Water, Niacinamide, Glycerin, Propanediol, Methyl Gluceth-20, Hydroxyacetophenone, Sodium Hyaluronate, Caprylyl Glycol, Carbomer, Sodium Hydroxide

Dimethicone

Aluminum Starch Octenylsuccinate

Butylene Glycol

Panthenol

Polysorbate 20

Actinidia Chinensis Fruit Extract

Chrysanthemum Parthenium Extract

Glycyrrhiza Glabra Root Extract

Camellia Sinensis Leaf Extract

Allantoin

Aminomethyl Propanol

Undecylenoyl Phenylalanine

Acrylates/Vinyl Isodecanoate Crosspolymer

Dimethiconol

Laureth-4

Glyceryl Acrylate/Acrylic Acid Copolymer

Phenoxyethanol

Disodium EDTA

Pvm/Ma Copolymer

Tetrasodium EDTA

Water, Niacinamide, Dimethicone, Aluminum Starch Octenylsuccinate, Glycerin, Butylene Glycol, Panthenol, Polysorbate 20, Actinidia Chinensis Fruit Extract, Chrysanthemum Parthenium Extract, Glycyrrhiza Glabra Root Extract, Camellia Sinensis Leaf Extract, Allantoin, Aminomethyl Propanol, Hydroxyacetophenone, Undecylenoyl Phenylalanine, Acrylates/Vinyl Isodecanoate Crosspolymer, Dimethiconol, Laureth-4, Glyceryl Acrylate/Acrylic Acid Copolymer, Phenoxyethanol, Disodium EDTA, Pvm/Ma Copolymer, Tetrasodium EDTA

Reviews

Be the first to review

Alternatives

Ingredients Explained

These ingredients are found in both products.

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

Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.

Topically, glycerin does several things at once:

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

Hydroxyacetophenone is a small phenolic molecule that earns its place in a formulas as an antioxidant and preservative booster.

As a phenol, it is able to neutralize free radicals to protect both the product and the skin from oxidative stress.

Though it can't kill microbes on its own, it works as a good supporting agent when combined with other preservatives like Phenoxyethanol or 1,2-Hexanediol.

This ingredient naturally occurs as piceol in Norwegian spruce needles (~0.4-1.1% dry weight and in cloudberries). Though the cosmetic-grade material is synthesized for purity and consistency.

You'll usually see it used at low levels and suppliers recommend up to 1% added to a water phase.

Safety testing was done at concentrations like 0.05% in SPF products and 0.5% in a Human Repeated Insult Patch Test. The safety evidence is assuring; this ingredient is safe for cosmetics in current use and also holds safety status as a food flavoring as well.

An honest caveat: the "soothing" and "anti-inflammatory" claims come mostly from supplier marketing rather than published clinical trials. The Cosmetic Ingredient Review's own literature search found no useful efficacy studies on this ingredient.

So the antioxidant and preservative-boosting roles are the well supported ones while the calming benefit is plausible but thinly evidenced.

Overall, this is a well-tolerated, low-irritation multitasker that quietly helps a formula stay fresh and stable.

Niacinamide is a multitasking form of vitamin B3 that strengthens the skin barrier, reduces pores and dark spots, regulates oil, and improves signs of aging.

And the best part? It's gentle and well-tolerated by most skin types, including sensitive and reactive skin.

You might have heard of "niacin flush", or the reddening of skin that causes itchiness. Niacinamide has not been found to cause this.

In very rare cases, some individuals may not be able to tolerate niacinamide at all or experience an allergic reaction to it.

If you are experiencing flaking, irritation, and dryness with this ingredient, be sure to double check all your products as this ingredient can be found in all categories of skincare.

When incorporating niacinamide into your routine, look out for concentration amounts. Typically, 5% niacinamide provides benefits such as fading dark spots. However, if you have sensitive skin, it is better to begin with a smaller concentration.

When you apply niacinamide to your skin, your body converts it into nicotinamide adenine dinucleotide (NAD). NAD is an essential coenzyme that is already found in your cells as "fuel" and powers countless biological processes.

In your skin, NAD helps repair cell damage, produce new healthy cells, support collagen production, strengthen the skin barrier, and fight environmental stressors (like UV and pollution).

Our natural NAD levels start to decline with age, leading to slower skin repair, visible aging, and a weaker skin barrier. By providing your skin niacinamide, you're recharging your skin's NAD levels. This leads to stronger, healthier, and younger looking skin.

Another name for vitamin B3 is nicotinamide. This vitamin is water-soluble and our bodies don't store it. We obtain Vitamin B3 from either food or skincare. Meat, fish, wheat, yeast, and leafy greens contain vitamin B3.

The type of niacinamide used in skincare is synthetically created.

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!

Similar Comparisons