Double Boosting Anti-aging Serum

The base most products are built on. It carries the other ingredients and has no safety concern.

A humectant that draws water into the skin. One of the best-studied, best-tolerated ingredients in personal care.

A lightweight, silicone-like emollient derived from coconut/palm fatty alcohols, used to give lotions a smoother, less greasy feel. Listed in the EU CosIng database as a skin-conditioning agent with no restrictions.

A water-soluble humectant that holds moisture and gives essences a soft feel. It is well tolerated and graded low concern in published assessments.

A lightweight hydrocarbon that gives formulas a smooth, silky feel. Used in color cosmetics and sunscreens. Well tolerated and inert.

A common emulsifier and texture-softener made from glycerin and stearic acid. CIR review of this class found no evidence of reproductive, carcinogenic, sensitizing, or phototoxic effects in the studies examined.

A PEG-based emulsifier that blends oils and water in formulas. It is a workhorse ingredient in stable emulsions and is approved for cosmetic use. Well tolerated.

A widely used preservative, safe at the legal limit of 1% or less. Often the "paraben-free" replacement.

A rheology modifier that thickens gels and serums while maintaining a lightweight, non-sticky feel. Provides suspension and stability in water-based formulas. Widely used and well tolerated.

A cross-linked polymer used to thicken formulas and create lightweight gel textures. The large molecular weight prevents penetration into the skin and is not absorbed; well tolerated in cosmetics.

A mild emulsifier derived from plant glycerin and stearic acid that is widely used in natural and clean formulations. Published assessments show it to be well tolerated with no known safety concerns at cosmetic use levels.

Chlorphenesin is a preservative subject to an EU maximum concentration limit and has been linked to contact dermatitis in a minority of users, particularly with repeated exposure. Most people tolerate it at the regulated use level without issue.

A wax ester derived from jojoba oil that closely resembles the skin's own sebum esters, used to soften and smooth skin. Available safety data has not flagged meaningful irritation or sensitization risk at cosmetic use levels.

A chelating agent that binds trace metal ions to keep formulas stable and preservatives working properly. It is not a functional skincare "active" and only a very small amount is used, with minimal skin penetration expected.

A cellulose derivative used to thicken gels, serums, and cleansers. It is well studied and widely used in pharmaceuticals and cosmetics. No meaningful safety concerns have been raised at typical cosmetic use levels.

A natural, water-soluble polysaccharide gum harvested from the acacia tree, used to thicken and stabilize cosmetic formulations. It has a long history of safe use in personal care products. Very rare contact allergies or sensitivities have been reported in sensitized individuals.

A fatty alcohol used to soften skin and stabilize creams. Despite the name, it does not dry the skin.

Xanthan gum is a microbial-fermentation-derived polysaccharide used to thicken and stabilize textures, similarly common in food. Cosmetic panel review of this and related microbial gums found them safe as used, with no meaningful irritation signal at typical concentrations.

A polysaccharide produced by yeast fermentation used as a film-former and thickener in serums and gels. Its safety profile is supported by extensive use in food and cosmetic applications.

A synthetic surfactant widely used to emulsify oils and water in cosmetics. It is well tolerated and has been used safely in cosmetic formulations for decades.

An emulsifier made from sorbitol and isostearic acid, used to stabilize oil-in-water formulas. The Cosmetic Ingredient Review panel assessed it as safe for cosmetic use at typical concentrations.

A class of naturally derived lipid compounds used to soften skin and support barrier health. They are extracted from plants or microorganisms and used at low concentrations as conditioning agents. Well tolerated with rare contact sensitivity.

A filtrate of garden snail mucus containing glycoproteins, hyaluronic acid, allantoin and glycolic acid. A handful of small industry-funded trials report improved hydration and reduced fine lines after several weeks of use, but independent, well-controlled human data are scarce, so treat the "repair" and "glass skin" marketing as unproven rather than false.

Collagen protein hydrolyzed into smaller peptide fragments used in skincare formulations. It is graded low concern, with very rare reports of sensitization. Those with severe shellfish allergies may want to verify sourcing.

A lightweight humectant and solvent similar in role to propylene glycol, used to carry actives and give lotions a lighter feel. CIR has reviewed it and considers it safe as used in cosmetics.

A corn-derived solvent and humectant that has largely replaced propylene glycol in "clean" formulas; CIR reviewed the alkane diol group and found use concentrations up to about 40 percent in leave-on products like deodorant sticks with no meaningful irritation signal.

A naturally derived humectant made from fermented plant sugars that draws water into the skin. It is well tolerated in cosmetics and is used to support hydration and skin softness.

A pH buffer that neutralizes acidic ingredients to maintain a skin-compatible formulation pH. Decades of safety data and modern manufacturing practices support its use at cosmetic concentrations.

A humectant that holds water at the skin surface for a more hydrated look. No safety concern.

Used in tiny amounts to set a product to skin-friendly pH. No concern at those levels.

A salt derived from citric acid that buffers pH and prevents metal oxidation in formulas. Widely used in food and cosmetics, it is well tolerated at cosmetic concentrations.

A glycerin derivative used as a skin conditioner and preservative booster, often paired with phenoxyethanol to allow lower total preservative levels. It has a low irritation and sensitization profile in safety reviews.

A widely used emulsifier and solubilizer that has been in cosmetics and pharmaceuticals for decades. The CIR has assessed it as safe with no known concerns at typical cosmetic concentrations. As with any surfactant, some people with very sensitive skin may experience mild irritation.