The One

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

Pentylene glycol is a humectant and solvent that also offers mild antimicrobial support in formulas. It is generally well tolerated, with only rare reports of irritation, mostly in already sensitive or compromised skin.

A rich plant butter pressed from shea tree nuts, valued for softening and cushioning dry skin. It is generally well tolerated, though very rare allergic reactions have been reported and people with tree nut allergies who are cautious may want to patch test first.

A stable, saturated version of squalene, a lipid the skin already produces, now usually sourced from olives or sugarcane instead of shark liver. It is very well tolerated across skin types and helps reinforce the skin barrier.

A blend of cetyl and stearyl fatty alcohols used to thicken lotions and soften skin. It is chemically unrelated to drying alcohols like ethanol, and the CIR expert panel has found fatty alcohols safe as used in cosmetics.

A form of vitamin B3 used to support a more even-looking tone and a comfortable barrier. Well tolerated at cosmetic levels.

A light coconut-derived emollient ester used as a natural-feeling alternative to silicones, giving a dry, velvety finish. It is well tolerated and graded low concern in published assessments.

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 rich botanical oil from avocado fruit, used to nourish and soften the skin. It is generally well tolerated across skin types and provides conditioning benefits.

An emulsifier made from cetyl alcohol and phosphoric acid, used to create stable creams with light conditioning properties. Well tolerated in finished products at cosmetic concentrations.

A plant-derived compound (from babchi seed) marketed as a gentler alternative to retinol, with some small clinical studies showing similar skin-texture benefits and less irritation. Evidence is still limited compared to retinoids, and formal safety review data are less extensive than for long-established ingredients.

A broken-down form of hyaluronic acid with smaller molecules intended to penetrate more deeply into the skin. It functions as a humectant and is well tolerated, with the same safety profile as standard hyaluronic acid.

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

A lab-made version of a lipid naturally found in the outer skin barrier. It is added to creams and cleansers to help replace lipids that washing can strip away, and it is not linked to irritation or safety concerns.

This is a stable, water-soluble derivative of vitamin C that converts to ascorbic acid in skin and is used for antioxidant and brightening support. It is generally better tolerated than plain ascorbic acid and has a low reported rate of irritation in formulation testing.

A soothing humectant that helps skin and hair look conditioned. Very well tolerated.

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 more stable, esterified form of vitamin E used as an antioxidant and skin-conditioning ingredient. It is a different substance from the vitamin E acetate implicated in vaping-related lung injury, which involved inhaling the oil, not applying it topically to skin.

A fermented extract of radish root that acts as a natural preservative and skin-conditioning agent. It has shown antimicrobial properties in formulation work and is well tolerated in rinse-off and leave-on products, though individual sensitivities can vary.

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 fermentation of fungal cultures, used to thicken and stabilize formulas. It is well tolerated in cosmetics and often chosen by natural-leaning brands. It functions similarly to other gelling agents but comes from a more controlled fermentation source.

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 plant-derived emulsifier made from glycerin, glucose, and stearic acid that helps blend oil and water phases. It is graded low concern in published cosmetic ingredient assessments and is well tolerated in both rinse-off and leave-on formulas.

A gentle humectant derived from glucose. It draws water to the skin and is mild enough for sensitive skin types. Widely used in cosmetics without reported safety concerns.

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

An undisclosed scent blend that can contain dozens of components. The single most common cause of cosmetic contact allergy, and the blend is not itemized, so you cannot see what is in it.