Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide Versus Tower 28 Beauty SOS Face Guard SPF 30

Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide Versus Tower 28 Beauty SOS Face Guard SPF 30 Detailed comparison of Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide versus Tower 28 Beauty SOS Face Guard SPF 30. This chemical sunscreen covers most of the UV range, lighter on the deep UVA that drives aging. This hybrid sunscreen covers the full UV range and blocks ~97% of UVB at SPF 30. Butyl Methoxydibenzoylmethane 3% Homosalate 7% Ethylhexyl Salicylate 5% Octocrylene 7% Water Glycerin C15-19 Alkane Propanediol C12-22 Alkyl Acrylate/Hydroxyethylacrylate Copolymer Tocopherol Sodium Stearoyl Glutamate Butylene Glycol Cetearyl Alcohol Sclerotium Gum Hydroxyacetophenone Caprylyl Glycol Sodium Starch Octenylsuccinate Glyceryl Stearate Jojoba Esters Helianthus Annuus Seed Wax Hydroxypropyl Starch Phosphate Trisodium Ethylenediamine Disuccinate Carbomer Sodium Lactate Sodium Hydroxide Polysorbate 20 Polyglycerin-3 Palmitoyl Tripeptide-1 Palmitoyl Tetrapeptide-7 Butyl Methoxydibenzoylmethane 3%, Homosalate 7%, Ethylhexyl Salicylate 5%, Octocrylene 7%, Water, Glycerin, C15-19 Alkane, Propanediol, C12-22 Alkyl Acrylate/Hydroxyethylacrylate Copolymer, Tocopherol, Sodium Stearoyl Glutamate, Butylene Glycol, Cetearyl Alcohol, Sclerotium Gum, Hydroxyacetophenone, Caprylyl Glycol, Sodium Starch Octenylsuccinate, Glyceryl Stearate, Jojoba Esters, Helianthus Annuus Seed Wax, Hydroxypropyl Starch Phosphate, Trisodium Ethylenediamine Disuccinate, Carbomer, Sodium Lactate, Sodium Hydroxide, Polysorbate 20, Polyglycerin-3, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7 Zinc Oxide Allantoin Bisabolol Butyloctyl Salicylate C12-15 Alkyl Benzoate Caprylic/Capric Triglyceride Capryloyl Glycerin/Sebacic Acid Copolymer Ceramide AP Ceramide EOP Ceramide NP Cetyl Palmitate Cholesterol Citric Acid Diisopropyl Sebacate Ethylhexyl Methoxycrylene Ethylhexylglycerin Garcinia Indica Seed Butter Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer Isodecyl Neopentanoate Lauryl Lactate Phenoxyethanol Phytosphingosine Polyhydroxystearic Acid Polysorbate 60 Potassium Cetyl Phosphate Sodium Hyaluronate Sodium Lauroyl Lactylate Sorbitan Isostearate Sorbitan Olivate Sorbitan Palmitate Squalane Tetrasodium Glutamate Diacetate Triethoxycaprylylsilane Xanthan Gum CI 77491 CI 77492 CI 77499 Zinc Oxide, Allantoin, Bisabolol, Butyloctyl Salicylate, C12-15 Alkyl Benzoate, Caprylic/Capric Triglyceride, Capryloyl Glycerin/Sebacic Acid Copolymer, Carbomer, Ceramide AP, Ceramide EOP, Ceramide NP, Cetearyl Alcohol, Cetyl Palmitate, Cholesterol, Citric Acid, Diisopropyl Sebacate, Ethylhexyl Methoxycrylene, Ethylhexylglycerin, Garcinia Indica Seed Butter, Glycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Isodecyl Neopentanoate, Lauryl Lactate, Phenoxyethanol, Phytosphingosine, Polyhydroxystearic Acid, Polysorbate 60, Potassium Cetyl Phosphate, Sodium Hyaluronate, Sodium Hydroxide, Sodium Lauroyl Lactylate, Sorbitan Isostearate, Sorbitan Olivate, Sorbitan Palmitate, Squalane, Tetrasodium Glutamate Diacetate, Tocopherol, Triethoxycaprylylsilane, Water, Xanthan Gum, CI 77491, CI 77492, CI 77499 These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. 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. Cetearyl alcohol is a waxy mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is an emollient and emulsifier. Despite having "alcohol" in its name, it has nothing to do with drying solvent alcohols; the FDA also allows "alcohol-free" products to contain fatty alcohols like this ingredient. It plays several roles in a formula: Typical use levels for this ingredient sit around 1-10% and the Cosmetic Ingredient Review Expert Panel has affirmed safety at concentrations up to 25% in leave-on products. Multiple assessments have found it to be non-irritating and non-sensitizing to most people. However, there have been some cases of allergic contact dermatitis in patients with chronically compromised skin barriers. Cetearyl alcohol has a comedogenic rating of 2 and irritancy rating of 1. Both of these numbers come from the 1989 study that used rabbit ears; a "2" means mildly comedogenic and a "1" means low irritancy. Here's the catch: rabbit skin is more sensitive than human skin and throws a lot of false positives. A 1996 reappraisal found that ingredients rated 1-2 in the rabbit ear tests are generally safe for humans. Remember comedogenic ratings are unable to assess the entire formula of a product or how it will react on your skin. Just be sure to patch test if you are unsure about certain ingredients. This ingredient is not fungal acne safe. Cetearyl alcohol is a fatty alcohol with chain lengths that fall within the range that Malassezia can metabolize. A 2019 study has also observed Malassezia growth in the presence of this ingredient, confirming it to be not-fungal acne safe. 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 c