Medik8 Hydr8 B5 Intense Versus Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum

Medik8 Hydr8 B5 Intense Versus Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum Detailed comparison of Medik8 Hydr8 B5 Intense versus Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum. This hydrating serum is formulated around Panthenol and Sodium Hyaluronate to hydrate skin and strengthen the skin barrier. This hydrating serum is formulated around Sodium Hyaluronate to hydrate skin and strengthen the skin barrier. Water Panthenol Glyceryl Glucoside Propylene Glycol Sodium Hyaluronate Glycerin Sodium PCA Amelanchier Alnifolia Fruit Extract Urea Calcium Pantothenate Trehalose Taurine Creatine Diglycerin Acetyl Glucosamine Daucus Carota Sativa Juice Glycine Soja Seed Extract Lysine Hcl Alanine Arginine Histidine Hcl Biosaccharide Gum-1 Phenoxyethanol Serine Allantoin Proline Lactic Acid Ethylhexylglycerin Hydroxyacetophenone Hydrolyzed Wheat Protein Lysine PCA Sorbitol Glutamic Acid Threonine Valine Leucine Glycine Isoleucine Phenylalanine Potassium Sorbate Sodium Benzoate Citric Acid Water, Panthenol, Glyceryl Glucoside, Propylene Glycol, Sodium Hyaluronate, Glycerin, Sodium PCA, Amelanchier Alnifolia Fruit Extract, Urea, Calcium Pantothenate, Trehalose, Taurine, Creatine, Diglycerin, Acetyl Glucosamine, Daucus Carota Sativa Juice, Glycine Soja Seed Extract, Lysine Hcl, Alanine, Arginine, Histidine Hcl, Biosaccharide Gum-1, Phenoxyethanol, Serine, Allantoin, Proline, Lactic Acid, Ethylhexylglycerin, Hydroxyacetophenone, Hydrolyzed Wheat Protein, Lysine, PCA, Sorbitol, Glutamic Acid, Threonine, Valine, Leucine, Glycine, Isoleucine, Phenylalanine, Potassium Sorbate, Sodium Benzoate, Citric Acid Chlorphenesin Tetrasodium Glutamate Diacetate Water, Glycerin, Sodium Hyaluronate, Phenoxyethanol, Chlorphenesin, Tetrasodium Glutamate Diacetate, Citric Acid 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. 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.