2-In-1 Purifying Facial Mask and Exfoliator

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

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

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 lightweight, odorless emollient made by combining coconut or palm-derived fatty acids with glycerin. It spreads easily, feels non-greasy, and has a long history of use in skin and hair products with no meaningful irritation or sensitization signal.

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

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 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.

Technically a liquid wax ester rather than a true oil, jojoba closely resembles skin's own sebum and absorbs without feeling greasy. It is well tolerated across skin types, including acne-prone skin, with no significant irritation or comedogenicity signal in the available data.

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 common preservative and fragrance/solvent ingredient found naturally in many essential oils. It is well tolerated by most people at the levels used in cosmetics, but it is one of the 26 EU-designated fragrance allergens and can trigger reactions in people with an existing sensitivity.

A beta hydroxy acid used to smooth texture and clear pores. Safe at cosmetic levels; can be mildly irritating if overused.

A widely used, gentle preservative also common in food. It is generally well tolerated, though it can occasionally cause mild, transient irritation in people with already-compromised or very reactive skin.

An oil rich in omega-6 fatty acids, particularly linoleic acid, sourced from evening primrose seeds. It is well tolerated as a skin conditioner and is included in formulas designed to support the skin barrier.

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.

An essential oil from lavandin, a sterile hybrid of lavender species, with a floral and herbaceous scent. Most people tolerate it well, though contact allergy and sensitization have been documented in patch-test studies, particularly in individuals with existing fragrance sensitivity or in leave-on products.

A soothing, skin-conditioning compound (also found in comfrey root) commonly added to calm and hydrate irritated or sensitive skin. It has a long history of safe use with very low irritation potential.

A lightweight carrier oil expressed from macadamia nuts, rich in oleic acid and similar in composition to skin lipids. Very well tolerated in cosmetic use, though individuals with tree nut allergies who are cautious may want to patch test.

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.

A citrus essential oil with a fresh scent, extracted from lemon peel. It contains recognized fragrance allergen constituents (limonene, citral) and can trigger contact reactions in fragrance-sensitive individuals. Additionally, citrus peel oils carry documented phototoxicity risk, meaning skin treated with the product should avoid direct sunlight.

A fragrance component with a mild rose and honey scent, widely used in cosmetics and personal care products. Most people tolerate it without issue, though patch-test studies indicate a minority of individuals with fragrance sensitivities may react to it.

An antioxidant that helps protect a formula and condition skin. Well tolerated.

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

A fast-evaporating solvent used to carry actives and give toners a light, "clean" feel; at the concentrations used in classic astringents it can be genuinely drying or irritating with repeated use, especially on dry or compromised skin, though it is not inherently toxic and is a normal, well-studied cosmetic ingredient.

A strong alkali used in tiny amounts to adjust the pH of cosmetics to safe, skin-friendly levels. At the pH found in finished products, sodium hydroxide is neutralized and well tolerated.

A floral fragrance component and one of the EU-labelled fragrance allergens. Usually fine, worth watching if you react to scented products.

A citrus-scented fragrance component. Fine for most, but it oxidizes over time into a known contact allergen, so it must be labelled in the EU.

A floral, rose-like fragrance compound found in many essential oils. It is one of the 26 EU-designated fragrance allergens, meaning a documented minority of people can develop contact sensitization, so brands must disclose it above set thresholds.

A sweet, hay-like fragrance ingredient naturally found in tonka bean and lavender. It is one of the 26 EU-designated fragrance allergens and is also subject to an EU maximum concentration limit in finished cosmetic products.

A fragrance fixative and solvent found naturally in balsams and used to help scents last longer. It is one of the 26 EU-designated fragrance allergens, with documented but uncommon contact sensitization.

A natural fragrance component found in citrus oils and lemongrass, giving a lemony scent. It is a named EU fragrance allergen that can oxidize into potent contact allergens over time; people with known fragrance sensitivities may react.

A rose-scented fragrance ingredient found naturally in geranium and rose oil. It is one of the 26 fragrance allergens the EU requires to be labeled by name because a minority of people develop skin sensitization to it, though most users tolerate it without issue.