Kiehl's Ferulic Brew Antioxidant Facial Treatment with Lactic Acid Versus Biossance Squalane + 10% Lactic Acid Resurfacing Night Serum

Kiehl's Ferulic Brew Antioxidant Facial Treatment with Lactic Acid Versus Biossance Squalane + 10% Lactic Acid Resurfacing Night Serum Detailed comparison of Kiehl's Ferulic Brew Antioxidant Facial Treatment with Lactic Acid versus Biossance Squalane + 10% Lactic Acid Resurfacing Night Serum. This smoothing essence is formulated around Lactic Acid and Ferulic Acid to refine skin texture and brighten dull-looking skin. This smoothing serum is formulated around Lactic Acid and Squalane to refine skin texture and brighten dull-looking skin. Water Arginine Saccharomyces/Rice Ferment Filtrate Dicaprylyl Ether Glycerin Pentylene Glycol Lactic Acid Propanediol Squalane Butylene Glycol Sodium Chloride Tocopherol Ascorbyl Glucoside Salicylic Acid Ferulic Acid Caramel Adenosine Lavandula Hybrida Oil Helianthus Annuus Seed Oil Cupressus Sempervirens Leaf/Nut/Stem Oil Anthemis Nobilis Flower Oil Linalool Pelargonium Graveolens Flower Oil Brassica Campestris Extract Brassica Napus Extract Brassica Campestris Sprout Extract Mentha Piperita Oil Sodium Hyaluronate Citronellol Geraniol Limonene Origanum Majorana Leaf Oil Water, Arginine, Saccharomyces/Rice Ferment Filtrate, Dicaprylyl Ether, Glycerin, Pentylene Glycol, Lactic Acid, Propanediol, Squalane, Butylene Glycol, Sodium Chloride, Tocopherol, Ascorbyl Glucoside, Salicylic Acid, Ferulic Acid, Caramel, Adenosine, Lavandula Hybrida Oil, Helianthus Annuus Seed Oil, Cupressus Sempervirens Leaf/Nut/Stem Oil, Anthemis Nobilis Flower Oil, Linalool, Pelargonium Graveolens Flower Oil, Brassica Campestris Extract, Brassica Napus Extract, Brassica Campestris Sprout Extract, Mentha Piperita Oil, Sodium Hyaluronate, Citronellol, Geraniol, Limonene, Origanum Majorana Leaf Oil Caprylic/Capric Triglyceride Sodium Hydroxide Cetearyl Olivate Sorbitan Olivate Cetearyl Alcohol Lespedeza Capitata Leaf/Stem Extract Polyacrylate Crosspolymer-6 Acacia Senegal Gum Sodium Gluconate Xanthan Gum Phenoxyethanol Ethylhexylglycerin Lavandula Angustifolia Oil Water, Caprylic/Capric Triglyceride, Lactic Acid, Squalane, Glycerin, Sodium Hydroxide, Cetearyl Olivate, Propanediol, Sorbitan Olivate, Cetearyl Alcohol, Lespedeza Capitata Leaf/Stem Extract, Polyacrylate Crosspolymer-6, Acacia Senegal Gum, Sodium Gluconate, Xanthan Gum, Phenoxyethanol, Ethylhexylglycerin, Lavandula Angustifolia Oil, Linalool 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. 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. Lactic Acid is another well-loved alpha hydroxy acid (AHA). It is gentler than glycolic acid but still highly effective. Its main role is to exfoliate the surface of the skin by loosening the “glue” that holds dead skin cells together. Shedding those old cells leads to smoother, softer, and more even-toned skin. Because lactic acid molecules are larger than glycolic acid, they don’t penetrate as deeply. This means they’re less likely to sting or irritate, making it a great choice for beginners or those with sensitive skin. Like glycolic acid, it can: Lactic acid also acts as a humectant (like hyaluronic acid). It can draw water into the skin to improve hydration and also plays a role in the skin's natural moisturizing factor (NMF) in the form of sodium lactate. Studies show it can boost ceramide production to strengthen the skin barrier and even help balance the skin’s microbiome. To get results, choose products with a pH between 3-4. Lower strengths (5-12%) focus on surface exfoliation; higher strengths (12% and up) can reach deeper in the dermis (deeper, supportive layer) to improve skin texture and firmness over time. Though it was originally derived from milk, most modern lactic acid used in skincare is vegan. It is made through non-dairy fermentation to create a bio-identical and stable form suitable for all formulations. When lactic acid shows up near the end of an ingredient list, it usually means the brand added just a tiny amount to adjust the product’s pH. Legend has it that Cleopatra used to bathe in sour milk to help reduce wrinkles. Lactic acid is truly a gentle multitasker: it exfoliates, hydrates, strengthens, and brightens. It's a great ingredient for giving your skin a smooth, glowing, and healthy look without the harshness of stronger acids. Read more about some other popular AHA's here: Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon