Kiehl's Auto-Tone Discoloration & UV Solution SPF 30 Versus Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide

Kiehl's Auto-Tone Discoloration & UV Solution SPF 30 Versus Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide Detailed comparison of Kiehl's Auto-Tone Discoloration & UV Solution SPF 30 versus Kiehl's Better Screen UV Serum SPF 50+ Facial Sunscreen With Collagen Peptide. This brightening treatment is formulated around Niacinamide and 2-Mercaptonicotinoyl Glycine to fade the look of dark spots and brighten dull-looking skin. This chemical sunscreen covers most of the UV range, lighter on the deep UVA that drives aging. Butyl Methoxydibenzoylmethane 3% Homosalate 10% Ethylhexyl Salicylate 5% Octocrylene 7% Water C15-19 Alkane Niacinamide Glycerin Butylene Glycol Silica Titanium Dioxide Hydroxyacetophenone Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate Potassium Hydroxide Sodium Thiosulfate Taraxacum Officinale Rhizome/Root Extract Trisodium Ethylenediamine Disuccinate 2-Mercaptonicotinoyl Glycine Butyrospermum Parkii Butter Ammonium Acryloyldimethyltaurate/Vp Copolymer Arachidyl Alcohol Arachidyl Glucoside Behenyl Alcohol Caprylyl Glycol Carbomer Citric Acid Mica Pentylene Glycol Poly C10-30 Alkyl Acrylate Polyglyceryl-4 Caprate Sodium Dilauramidoglutamide Lysine Tin Oxide Xanthan Gum CI 14700 Phenoxyethanol Butyl Methoxydibenzoylmethane 3%, Homosalate 10%, Ethylhexyl Salicylate 5%, Octocrylene 7%, Water, C15-19 Alkane, Niacinamide, Glycerin, Butylene Glycol, Silica, Titanium Dioxide, Hydroxyacetophenone, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Potassium Hydroxide, Sodium Thiosulfate, Taraxacum Officinale Rhizome/Root Extract, Trisodium Ethylenediamine Disuccinate, 2-Mercaptonicotinoyl Glycine, Butyrospermum Parkii Butter, Ammonium Acryloyldimethyltaurate/Vp Copolymer, Arachidyl Alcohol, Arachidyl Glucoside, Behenyl Alcohol, Caprylyl Glycol, Carbomer, Citric Acid, Mica, Pentylene Glycol, Poly C10-30 Alkyl Acrylate, Polyglyceryl-4 Caprate, Sodium Dilauramidoglutamide Lysine, Tin Oxide, Xanthan Gum, CI 14700, Phenoxyethanol Homosalate 7% Propanediol C12-22 Alkyl Acrylate/Hydroxyethylacrylate Copolymer Tocopherol Sodium Stearoyl Glutamate Cetearyl Alcohol Sclerotium Gum Sodium Starch Octenylsuccinate Glyceryl Stearate Jojoba Esters Helianthus Annuus Seed Wax Hydroxypropyl Starch Phosphate 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 These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Also known as Avobenzone, this ingredient is an oil-soluble used to absorb the full spectrum of UVA rays (peak 357 nm). It's one of the most effective UVA filters available but has a major caveat of photostability: avobenzone is susceptible to photodegradation. This means it can lose efficacy when exposed to sunlight without the help of a stabilizing agent. Studies show antioxidants (like vitamin E or vitamin C) and some UV filters (like octocrylene and Tinosorb S) can meaningfully improve its stability in a formulation. The maximum allowable concentration according to regulation is 3% in the US + Canada, and 5% in the EU, Australia, China, Korea, and ASEAN countries. It has a well-support safety profile: a comprehensive 2025 review found minimal toxicity with no evidence of carcinogenicity. Overall, avobenzone is a safe and regulated ingredient used in sunscreen for over 40 years. Butylene Glycol (or BG) is used within cosmetic products for a few different reasons: Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients. Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness. C15-19 alkane is a mixture of alkanes. Alkanes are hydrocarbons with carbon atoms held together by single bonds. It is a synthetically created solvent and emollient often used to replace silicones or mineral oil. As an emollient, C15-19 Alkane helps soften and soothe the skin. Emollients create a barrier to trap moisture inside. You'll often see this ingredient used with mineral UV filters such as titanium dioxidide and zinc oxide. It helps these UV filter ingredients be more spreadable. This ingredient is biodegradable. According to a manufacturer, it is also known as Hydrogenated Polyfarnesene. 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 pare