Allies of Skin 35% Vitamin C+ Perfecting Serum Versus Timeless Skin Care 20% Vitamin C + E Ferulic Acid Serum

Allies of Skin 35% Vitamin C+ Perfecting Serum Versus Timeless Skin Care 20% Vitamin C + E Ferulic Acid Serum Detailed comparison of Allies of Skin 35% Vitamin C+ Perfecting Serum versus Timeless Skin Care 20% Vitamin C + E Ferulic Acid Serum. This brightening serum is formulated around 3-O-Ethyl Ascorbic Acid and Tetrahexyldecyl Ascorbate to brighten dull-looking skin and fade the look of dark spots. This brightening serum is formulated around Ascorbic Acid and Tocopherol to brighten dull-looking skin and soften the look of wrinkles. No concerns Ethoxydiglycol 3-O-Ethyl Ascorbic Acid Tetrahexyldecyl Ascorbate Dimethyl Isosorbide Isodecyl Neopentanoate Glutathione Superoxide Dismutase Ethylhexylglycerin Caprylyl Glycol Phenoxyethanol Ethoxydiglycol, 3-O-Ethyl Ascorbic Acid, Tetrahexyldecyl Ascorbate, Dimethyl Isosorbide, Isodecyl Neopentanoate, Glutathione, Superoxide Dismutase, Ethylhexylglycerin, Caprylyl Glycol, Phenoxyethanol Water Ascorbic Acid Propylene Glycol Tocopherol Polysorbate 80 Panthenol Ferulic Acid Sodium Hyaluronate Benzyl Alcohol Dehydroacetic Acid Water, Ethoxydiglycol, Ascorbic Acid, Propylene Glycol, Tocopherol, Polysorbate 80, Panthenol, Ferulic Acid, Sodium Hyaluronate, Benzyl Alcohol, Dehydroacetic Acid 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. Ethoxydiglycol (aka Diethylene Glycol Monoethyl Ether) is one of the cosmetic world's quiet problem solvers. In a formula, it is a solvent that dissolves tricky ingredients that don't want to mix in and helps spread ingredients evenly across your skin without leaving a greasy or sticky feeling This makes it great for hard-to-dissolve actives like vitamin C, benzoyl peroxide, and self-tanner DHA. It also has mild humectant and penetration enhancer abilities so it can help some actives absorb a little deeper. The penetration boost is backed by lab research: studies using human skin samples found it improved how well an active dissolves into the upper layer of skin rather than tearing down your skin barrier. Reviews of its mechanism also describe it interacting gently with the lipids and water in your outermost layer of skin. Just know this penetration-enhancing effect is not universal. It helps a lot in some formulas and did very little in others (so the benefit really depends on the specific product). Safety-wise, the evidence is reassuring. The Cosmetic Ingredient Review Expert Panel reviewed it and concluded it's safe for use in cosmetics and recognized it as non-irritating, non-sensitizing, and non-comedogenic in skincare. Typical leave-on skincare usage lands around 1-10%. The EU has sets caps of 2.6% in non-spray products, 10% in rinse-offs, 7% in oxidative hair dye, and 5% in non-oxidative hair dye.