K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo Versus Ouai Fine Hair Shampoo

K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo Versus Ouai Fine Hair Shampoo Detailed comparison of K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo versus Ouai Fine Hair Shampoo. No key ingredients Water Sodium C14-16 Olefin Sulfonate Cocamidopropyl Betaine Sodium Methyl 2-Sulfolaurate Sodium Lauryl Sulfoacetate Sh-Oligopeptide-78 Panthenol Glycerin Sodium Phytate Guar Hydroxypropyltrimonium Chloride Disodium 2-Sulfolaurate Caprylyl Glycol Caprylhydroxamic Acid Benzoic Acid Citric Acid Sodium Hydroxide Parfum Limonene Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl 2-Sulfolaurate, Sodium Lauryl Sulfoacetate, Sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Disodium 2-Sulfolaurate, Caprylyl Glycol, Caprylhydroxamic Acid, Benzoic Acid, Citric Acid, Sodium Hydroxide, Parfum, Limonene Sodium Methyl Cocoyl Taurate PEG-200 Hydrogenated Glyceryl Palmate Cocamide Mipa Cocoglucosides Hydroxypropyltrimonium Chloride Hydrolyzed Keratin Biotin Salvia Hispanica Seed Oil Cetrimonium Chloride Hydroxypropyl Guar Hydroxypropyltrimonium Chloride Sodium Lauroyl Glycinate PEG-150 Distearate Propoxytetramethyl Piperidinyl Dimethicone Trideceth-6 C11-15 Pareth-7 PEG-7 Glyceryl Cocoate Sodium Chloride Polyquaternium-7 Disodium EDTA Tetrasodium EDTA Potassium Sorbate Sodium Benzoate Phenoxyethanol Benzyl Alcohol Acetic Acid Sodium Acetate Benzyl Salicylate Hexyl Cinnamal Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl Cocoyl Taurate, PEG-200 Hydrogenated Glyceryl Palmate, Cocamide Mipa, Parfum, Panthenol, Cocoglucosides Hydroxypropyltrimonium Chloride, Hydrolyzed Keratin, Biotin, Salvia Hispanica Seed Oil, Cetrimonium Chloride, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Glycerin, Sodium Lauroyl Glycinate, PEG-150 Distearate, Propoxytetramethyl Piperidinyl Dimethicone, Trideceth-6, C11-15 Pareth-7, PEG-7 Glyceryl Cocoate, Sodium Chloride, Polyquaternium-7, Disodium EDTA, Citric Acid, Sodium Hydroxide, Tetrasodium EDTA, Potassium Sorbate, Sodium Benzoate, Phenoxyethanol, Benzyl Alcohol, Acetic Acid, Sodium Acetate, Benzyl Salicylate, Limonene, Hexyl Cinnamal Be the first to review These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Citric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes. Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath. However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products. Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH. In skincare formulas, citric acid can: While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants. Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations. Rosacea skin has a lower threshold for acids generally, with 62.5% of rosacea subjects in one study reacting to lactic acid in a sting test. This is why we mark citric acid as a potential rosacea trigger. However, this ingredient shows up as a pH adjuster or chelator at roughly 0.1-1% in many products. These low levels are unlikely to be an issue for rosacea skin and becomes a potential trigger at exfoliating concentrations (20%). Because everybody's skin is unique, we recommend a patch test if you are unsure. Cocamidopropyl Betaine is a fatty acid created by mixing similar compounds in coconut oil and dimethylaminopropylamine, a compound with two amino groups. This ingredient is a surfactant and cleanser. It helps gather the dirt, pollutants, and other impurities in your skin to be washed away. It also helps thicken a product and make the texture more creamy. Being created from coconut oil means Cocamidopropyl Betaine is hydrating for the skin. While Cocamidopropyl Betaine was believed to be an allergen, a study from 2012 disproved this. It found two compounds in unpure Cocamidopropyl Betaine to be the irritants: aminoamide and 3-dimethylaminopropylamine. High-grade and pure Cocamidopropyl Betaine did not induce allergic reactions during this study. 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