Peptide Skincare & BeautySkin science and ingredient guides

Ingredient or product comparison

Ouai Medium Hair Shampoo Versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo

Ouai Medium Hair Shampoo Versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo Detailed comparison of Ouai Medium Hair Shampoo versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo. Water Sodium C14-16 Olefin Sulfonate Cocamidopropyl Betaine Sodium Methyl Co

This source-based comparison does not add ratings or recommend a winner.

Ouai Medium Hair Shampoo Versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo Detailed comparison of Ouai Medium Hair Shampoo versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo. Water Sodium C14-16 Olefin Sulfonate Cocamidopropyl Betaine Sodium Methyl Cocoyl Taurate Cocamide Mipa Glycol Distearate Parfum Amodimethicone Hydroxypropyl Guar Hydroxypropyltrimonium Chloride Glycerin Citrus Japonica Fruit Extract Panthenol Hydrolyzed Keratin Polyquaternium-7 Orbignya Oleifera Seed Oil Cocos Nucifera Oil PEG-150 Distearate Sodium Lauroyl Glycinate Cetrimonium Chloride C11-15 Pareth-7 Laureth-9 Trideceth-12 Cocoglucosides Hydroxypropyltrimonium Chloride Acrylates Copolymer Tocopherol PEG-200 Hydrogenated Glyceryl Palmate PEG-7 Glyceryl Cocoate Disodium EDTA Citric Acid Sodium Chloride Sodium Hydroxide Tetrasodium EDTA Phenoxyethanol Sodium Benzoate Potassium Sorbate Benzyl Alcohol Benzyl Salicylate Limonene Hexyl Cinnamal CI 15985 Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl Cocoyl Taurate, Cocamide Mipa, Glycol Distearate, Parfum, Amodimethicone, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Glycerin, Citrus Japonica Fruit Extract, Panthenol, Hydrolyzed Keratin, Polyquaternium-7, Orbignya Oleifera Seed Oil, Cocos Nucifera Oil, PEG-150 Distearate, Sodium Lauroyl Glycinate, Cetrimonium Chloride, C11-15 Pareth-7, Laureth-9, Trideceth-12, Cocoglucosides Hydroxypropyltrimonium Chloride, Acrylates Copolymer, Tocopherol, PEG-200 Hydrogenated Glyceryl Palmate, PEG-7 Glyceryl Cocoate, Disodium EDTA, Citric Acid, Sodium Chloride, Sodium Hydroxide, Tetrasodium EDTA, Phenoxyethanol, Sodium Benzoate, Potassium Sorbate, Benzyl Alcohol, Benzyl Salicylate, Limonene, Hexyl Cinnamal, CI 15985 Cocamidopropyl Hydroxysultaine Salicylic Acid Charcoal Powder Sh-Oligopeptide-78 Sodium Phytate Guar Hydroxypropyltrimonium Chloride Caprylyl Glycol Caprylhydroxamic Acid Potassium Hydroxide Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Hydroxysultaine, Salicylic Acid, Charcoal Powder, Sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Caprylyl Glycol, Caprylhydroxamic Acid, Citric Acid, Potassium Hydroxide, Sodium Hydroxide, Parfum, Benzyl Salicylate, Limonene 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. Benzyl Salicylate is a solvent and fragrance additive. It is an ester of benzyl alcohol and salicylic acid. This ingredient can be naturally found in some plants and plant extracts. In fragrances, Benzyl Salicylate may be a solvent or a fragrance component. In synthetic musk scents, it is used as a solvent. For floral fragrances such as lilac and jasmine, it is used as a fragrance component. The natural scent of Benzyl Salicylate is described as "lightly-sweet, slightly balsamic". While Benzyl Salicylate has been associated with contact dermatitis and allergies, emerging studies show it may not be caused by this ingredient alone. However, this ingredient is often used with fragrances and other components that may cause allergies. It is still listed as a known allergen in the EU. We recommend speaking with a professional if you have concerns. Another study from 2021 shows Benzyl Salicylate may have anti-inflammatory properties. 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. 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. Interestin