Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum Versus Kiehl's Hydro-Plumping Hydrating Serum

Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum Versus Kiehl's Hydro-Plumping Hydrating Serum Detailed comparison of Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum versus Kiehl's Hydro-Plumping Hydrating Serum. This hydrating serum is formulated around Sodium Hyaluronate to hydrate skin and strengthen the skin barrier. This smoothing serum is formulated around Gluconolactone to refine skin texture. Water Glycerin Sodium Hyaluronate Phenoxyethanol Chlorphenesin Tetrasodium Glutamate Diacetate Citric Acid Water, Glycerin, Sodium Hyaluronate, Phenoxyethanol, Chlorphenesin, Tetrasodium Glutamate Diacetate, Citric Acid Dimethicone Propanediol Gluconolactone Dimethicone/PEG-10/15 Crosspolymer Polymethylsilsesquioxane Sodium Chloride Sodium Dextran Sulfate Sodium Hydroxide Sodium Citrate P-Anisic Acid Disodium EDTA PEG-10 Dimethicone Adenosine Dipropylene Glycol Tocopherol Water, Glycerin, Dimethicone, Propanediol, Gluconolactone, Dimethicone/PEG-10/15 Crosspolymer, Polymethylsilsesquioxane, Sodium Chloride, Sodium Dextran Sulfate, Sodium Hydroxide, Phenoxyethanol, Citric Acid, Chlorphenesin, Sodium Citrate, P-Anisic Acid, Disodium EDTA, PEG-10 Dimethicone, Adenosine, Dipropylene Glycol, Tocopherol These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Chlorphenesin is a synthetic preservative. It helps protect a product against bacteria in order to extend shelf life. In most cases, Chlorphenesin is paired with other preservatives such as phenoxyethanol and caprylyl glycol. Chlorphenesin is a biocide. This means it is able to help fight the microorganisms on our skin. It is also able to fight odor-releasing bacteria. Chlorphenesin is soluble in both water and glycerin. Studies show Chlorphenesin is easily absorbed by our skin. You should speak with a skincare professional if you have concerns about using Chlorphenesin. 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 humi