Kiehl's Retinol Skin-Renewing Daily Micro-Dose Serum

Glycerin is a widely used humectant that supports hydration and the skin barrier, with a long safety record and no known pregnancy or breastfeeding concerns in topical cosmetic use.

Solvent and humectant commonly used in leave-on products. Not associated with pregnancy-specific concerns at cosmetic exposure levels.

Humectant and preservative booster. Considered safe for cosmetic use with low systemic exposure.

Niacinamide (vitamin B3) is widely used for barrier support and tone/texture benefits, and is generally considered safe in pregnancy and breastfeeding when used topically at cosmetic concentrations.

Fatty alcohol used to improve texture and skin feel. Considered safe for cosmetic use without pregnancy-specific concerns.

Low-viscosity isoparaffin emollient used for slip and lightweight texture. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Emollient ester used for lightweight slip and a dry skin feel in makeup and skin care. Reviewed cosmetic ingredient references do not identify a pregnancy- or breastfeeding-specific concern for normal topical cosmetic use.

An ester of a dicarboxylic acid used as an emollient, solvent or texture agent. Cosmetic safety reviewers concluded that the assessed alkyl dicarboxylic acid esters are safe in current practices of use and concentration. No pregnancy-specific concern was identified for normal topical exposure.

A cosmetic functional ingredient used for conditioning, texture or formula support. Available cosmetic-use information did not identify a reproductive or developmental hazard from normal topical exposure.

Synthetic acetylated peptide ester used in topical soothing, skin-conditioning and anti-aging cosmetic formulas. Available cosmetic ingredient references do not identify a pregnancy- or breastfeeding-specific concern for normal topical cosmetic use.

Skin-conditioning ingredient commonly used in leave-on skincare. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Skin-identical barrier lipid used to support the stratum corneum and reduce dryness. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Amino-acid-derived conditioning and slip ingredient used especially in powders and colour cosmetics. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Fatty alcohol emollient used to improve spreadability and reduce drag. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Antioxidant and stabilizer used to protect cosmetic formulas from oxidation. Reviewed cosmetic ingredient references do not identify a pregnancy- or breastfeeding-specific concern for normal topical cosmetic use.

Sodium chloride is used to adjust viscosity and texture in formulations; topical cosmetic use is considered low concern with no known pregnancy or breastfeeding risks.

Sodium hyaluronate (hyaluronic acid salt) is used for hydration and cushioning, with very low systemic absorption from topical use and no known pregnancy or breastfeeding concerns at cosmetic concentrations.

pH adjuster used in very small quantities to balance formulations. Not associated with pregnancy-specific concerns.

Chelating ingredient used to improve formula stability by binding trace metals. Reviewed cosmetic ingredient references do not identify a pregnancy- or breastfeeding-specific concern for normal topical use.

Vitamin E antioxidant used to protect oils and support the skin barrier. Not associated with pregnancy-specific concerns at cosmetic exposure.

A lightweight fatty ether used as an emollient and spreading agent. Cosmetic safety reviewers concluded that dicaprylyl ether is safe in current cosmetic use; reviewed developmental testing did not identify maternal or fetal toxicity and skin absorption was low. Safety for airbrush delivery was not established.

A high-molecular-weight polymer used to thicken and stabilise formulas. Cosmetic safety reviewers concluded that acryloyldimethyltaurate polymers are safe in current cosmetic practices. Absorption of the finished polymer is expected to be limited, with residual monomers controlled during manufacture.

Long-chain fatty alcohol used as an emollient and thickener. This is not the same concern profile as simple drying alcohols; reviewed cosmetic safety sources support normal topical use.

Humectant and preservative booster used to support product stability. Low systemic exposure expected from topical cosmetic use.

Polymer thickener used to create gel textures. Large-molecule ingredient with negligible systemic absorption.

Fatty alcohol used as an emollient and thickener. Not the same as drying alcohols and not associated with pregnancy-specific concerns.

Sugar-based emulsifier used to stabilise creams and lotions. Reviewed cosmetic safety sources support topical cosmetic use; the relevant practical caveat is formulation irritation potential rather than a pregnancy-specific concern.

Cellulose-derived thickener used to build viscosity and improve texture. Reviewed cosmetic safety sources support normal topical use, with no pregnancy- or breastfeeding-specific topical signal identified in the material reviewed.

Emulsifier and skin-conditioning ingredient composed of phospholipids. Not associated with pregnancy-specific concerns.

A fragrance component and preservative-support ingredient. Cosmetic safety reviewers concluded that phenethyl alcohol is safe in cosmetic products at concentrations up to 1%. It can still irritate or sensitise some users, but no pregnancy-specific concern was identified at reviewed cosmetic exposure.

A sorbitol-derived fatty-acid ester used as an emulsifier and texture agent. Cosmetic safety reviewers concluded that sorbitan fatty-acid esters, including sorbitan laurate, are safe in current practices of use and concentration. No pregnancy-specific concern was identified for normal topical exposure.

steareth-100 is a cosmetic formulation, mineral, sugar-derived or organic-acid ingredient. Available identity, use and related safety evidence did not identify a pregnancy-specific concern for normal topical cosmetic exposure. Cosmetic-grade purity and ordinary irritation precautions remain applicable.