Kiehl's Micro-Dose Anti-Aging Retinol Serum with Ceramides and Peptide Versus Naturium Retinaldehyde Cream Serum 0.10%

Kiehl's Micro-Dose Anti-Aging Retinol Serum with Ceramides and Peptide Versus Naturium Retinaldehyde Cream Serum 0.10% Detailed comparison of Kiehl's Micro-Dose Anti-Aging Retinol Serum with Ceramides and Peptide versus Naturium Retinaldehyde Cream Serum 0.10%. This anti-aging serum is formulated around Niacinamide and Ceramide NP to soften the look of wrinkles and refine skin texture. This anti-aging serum is formulated around Retinal to soften the look of wrinkles and refine skin texture. Water Glycerin Butylene Glycol Pentylene Glycol Niacinamide Cetyl Alcohol Isohexadecane Isononyl Isononanoate Diisopropyl Sebacate 2-Oleamido-1,3-Octadecanediol 4-T-Butylcyclohexanol Acetyl Dipeptide-1 Cetyl Ester Adenosine Ceramide NP Hydroxypalmitoyl Sphinganine Lauroyl Lysine Octyldodecanol Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate Sodium Chloride Sodium Hyaluronate Sodium Hydroxide Trisodium Ethylenediamine Disuccinate Retinol Tocopherol Dicaprylyl Ether Ammonium Polyacryloyldimethyl Taurate Behenyl Alcohol Caprylyl Glycol Carbomer Cetearyl Alcohol Cetearyl Glucoside Glycine Soja Oil Helianthus Annuus Seed Oil Hydroxyethylcellulose Lecithin Phenethyl Alcohol Poloxamer 188 Polycaprolactone Sorbitan Laurate Steareth-100 CI 40800 Chlorphenesin Phenoxyethanol Water, Glycerin, Butylene Glycol, Pentylene Glycol, Niacinamide, Cetyl Alcohol, Isohexadecane, Isononyl Isononanoate, Diisopropyl Sebacate, 2-Oleamido-1,3-Octadecanediol, 4-T-Butylcyclohexanol, Acetyl Dipeptide-1 Cetyl Ester, Adenosine, Ceramide NP, Hydroxypalmitoyl Sphinganine, Lauroyl Lysine, Octyldodecanol, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Sodium Chloride, Sodium Hyaluronate, Sodium Hydroxide, Trisodium Ethylenediamine Disuccinate, Retinol, Tocopherol, Dicaprylyl Ether, Ammonium Polyacryloyldimethyl Taurate, Behenyl Alcohol, Caprylyl Glycol, Carbomer, Cetearyl Alcohol, Cetearyl Glucoside, Glycine Soja Oil, Helianthus Annuus Seed Oil, Hydroxyethylcellulose, Lecithin, Phenethyl Alcohol, Poloxamer 188, Polycaprolactone, Sorbitan Laurate, Steareth-100, CI 40800, Chlorphenesin, Phenoxyethanol Propanediol Triheptanoin C13-15 Alkane Coco-Caprylate/Caprate Faex Extract Apricot Kernel Oil Polyglyceryl-6 Esters Soy Amino Acids Punica Granatum Seed Extract Cetyl Diglyceryl Tris(Trimethylsiloxy)Silylethyl Dimethicone Hydrolyzed Yeast Extract Olivine Extract Dilinoleic Acid/Butanediol Copolymer Cellulose Sorbitan Oleate Sodium Metabisulfite Retinal Guanosine Uracil Polyacrylate Crosspolymer-6 C9-12 Alkane Polyglyceryl-10 Dipalmitate Dipropylene Glycol Glyceryl Polyacrylate Pvm/Ma Copolymer Adenosine Phosphate Castor Oil/Ipdi Copolymer Potassium Sorbate Hexadecene Sodium Benzoate T-Butyl Alcohol Water, Glycerin, Propanediol, Triheptanoin, C13-15 Alkane, Coco-Caprylate/Caprate, Carbomer, Faex Extract, Apricot Kernel Oil Polyglyceryl-6 Esters, Soy Amino Acids, Punica Granatum Seed Extract, Cetyl Diglyceryl Tris(Trimethylsiloxy)Silylethyl Dimethicone, Hydrolyzed Yeast Extract, Olivine Extract, Dilinoleic Acid/Butanediol Copolymer, Cellulose, Phenoxyethanol, Sorbitan Oleate, Sodium Metabisulfite, Retinal, Guanosine, Uracil, Polyacrylate Crosspolymer-6, C9-12 Alkane, Caprylyl Glycol, Polyglyceryl-10 Dipalmitate, Dipropylene Glycol, Sodium Hydroxide, Glyceryl Polyacrylate, Tocopherol, Pvm/Ma Copolymer, Adenosine Phosphate, Castor Oil/Ipdi Copolymer, Potassium Sorbate, Hexadecene, Sodium Benzoate, T-Butyl Alcohol These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created. Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin. Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on). Carbomer is a synthetic thickening and gelling agent. It's basically the ingredient that gives a lot of serums, gels, creams, and sunscreens their smooth, non-sticky texture. Although legally permitted at very high levels, carbomers are normally used at concentrations below 1%. It also needs to be neutralized to actually thicken, and because it is a large molecule, it doesn't really penetrate the skin barrier. Allergy-wise, the risk is very low. Clinical studies show carbomers have low potential for skin irritation/sensitization even at concentrations up to 100%. A 2024 UK study patch-tested 1,302 patients and found true allergy to the parent group of carbomer to be rare with no confirmed relevant reactions. 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. 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