A gentle, hydrating microalgae extract that helps skin retain moisture and defends against environmental stress.
Irritation
low
Source
natural
Beauty ingredient research
Browse the review database to understand what an ingredient is, what it does in a beauty formula, when it is useful, and when it deserves caution across skincare, haircare, bodycare, makeup, and more.
20769
Reviewed ingredients
524
Low-concern standouts
2884
Need usage caution
A gentle, hydrating microalgae extract that helps skin retain moisture and defends against environmental stress.
Irritation
low
Source
natural
A gentle, antioxidant-rich ferment that may help calm skin and defend against environmental stress, though research is still early.
Irritation
low
Source
biotech
A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in large human studies.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant extract that helps calm skin and defend against environmental stress.
Irritation
low
Source
natural
A gentle, antioxidant-rich extract from a rare Hawaiian succulent that may help calm irritated skin and fight free radical damage.
Irritation
low
Source
natural
A gentle, ocean-sourced extract that helps hydrate and calm the skin, but research on its benefits is still emerging.
Irritation
low
Source
natural
A gentle, amino-acid-based surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin and hair.
Irritation
low
Source
semi-synthetic
A mild, plant-derived surfactant that cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
semi-synthetic
A safe synthetic sweetener used in tiny amounts to improve taste in lip and oral products, but it offers no skincare benefit.
Irritation
low
Source
synthetic
Potassium Acetate is a safe, low-irritation salt that helps control a product's pH and can support preservative systems.
Irritation
low
Source
synthetic
A reliable synthetic thickener that gives gels and creams a smooth, non-sticky texture without clogging pores.
Irritation
low
Source
synthetic
A safe, synthetic polymer that gives products a silky feel and helps them spread evenly without clogging pores.
Irritation
low
Source
synthetic
A gentle, seaweed-derived thickener that gives products a smooth gel feel and can create a temporary tightening sensation on skin.
Irritation
low
Source
natural
Potassium alum is a mineral salt that tightens skin and reduces sweat, but its safety is debated due to aluminum content.
Irritation
moderate
Source
natural
A synthetic thickener that gives water-based products a smooth, gel-like feel; generally safe but not a functional active ingredient.
Irritation
low
Source
synthetic
A gentler, more stable form of vitamin C that brightens skin and fights free radicals with less irritation than pure ascorbic acid.
Irritation
low
Source
semi-synthetic
A stable, dual-antioxidant ingredient that helps brighten skin and fight free radical damage without the irritation of pure vitamin C.
Irritation
low
Source
semi-synthetic
A gentler, more stable vitamin C derivative that brightens skin and fights free radicals with less sting than pure ascorbic acid.
Irritation
low
Source
semi-synthetic
A well-tolerated alternative to azelaic acid that helps fade dark spots, calm redness, and refine pores without irritation.
Irritation
low
Source
semi-synthetic
A mild, plant-derived soap that cleans without stripping the skin, making it a great choice for sensitive or dry skin types.
Irritation
low
Source
natural
A gentle soap ingredient that helps create a creamy lather and is generally well-tolerated by most skin types.
Irritation
low
Source
semi-synthetic
A mild, amino-acid-based cleanser derived from rice protein that effectively cleanses without stripping the skin barrier.
Irritation
low
Source
semi-synthetic
A mild, amino-acid-based cleansing agent that cleans without stripping the skin's natural moisture barrier.
Irritation
low
Source
semi-synthetic
A gentle, widely used preservative that helps keep your products safe from bacteria and mold without common irritation.
Irritation
low
Source
synthetic
Potassium bicarbonate is a gentle pH adjuster that helps keep your skincare products stable and comfortable on skin, but it is not a star active ingredient.
Irritation
low
Source
synthetic
Potassium Biphthalate is a lab buffer with no proven skincare benefits; it's rarely used in cosmetics and offers no direct skin improvement.
Irritation
low
Source
synthetic
A gentle, food-derived ingredient that helps balance pH and provide mild exfoliation without harshness.
Irritation
low
Source
natural
A gentle, plant-derived cleansing agent that helps remove dirt and oil without stripping the skin, making it suitable for sensitive skin.
Irritation
low
Source
natural
Potassium borate is a synthetic salt used to adjust pH and preserve products, but it raises safety concerns due to its boron content and potential for irritation.
Irritation
moderate
Source
synthetic
Potassium bromide is a synthetic salt used as a preservative, but it has limited cosmetic use and potential irritation concerns.
Irritation
moderate
Source
synthetic
A synthetic film-former that helps makeup and sunscreen stay put longer, especially in water or sweat.
Irritation
low
Source
synthetic
A paraben preservative that is effective but controversial due to potential endocrine concerns; many brands now avoid it.
Irritation
low
Source
synthetic
A gentle, synthetic surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
synthetic
A gentle synthetic surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
synthetic
A gentle, effective cleansing ingredient that helps remove dirt and oil without stripping the skin.
Irritation
low
Source
synthetic
A gentle, synthetic surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
synthetic
A mild, plant-based cleanser that effectively removes dirt and oil without stripping the skin's natural moisture barrier.
Irritation
low
Source
natural
Potassium caprate is an effective, plant-derived cleanser, but it can be drying or irritating for sensitive skin types if used in high concentrations.
Irritation
moderate
Source
natural
A gentle, amino-acid-based brightener that helps fade dark spots without the irritation of stronger alternatives.
Irritation
low
Source
semi-synthetic
Potassium Caprylate is an effective, mild cleansing agent that helps remove dirt and oil without stripping the skin, but may be drying for very sensitive skin types.
Irritation
moderate
Source
semi-synthetic
A gentle, plant-derived cleansing agent that effectively removes dirt and oil without stripping the skin.
Irritation
low
Source
natural
A gentle, amino-acid-based surfactant that cleanses effectively without disrupting the skin barrier.
Irritation
low
Source
semi-synthetic
A mild, plant-derived surfactant that effectively cleanses while being gentle enough for sensitive skin.
Irritation
low
Source
semi-synthetic
A safe, effective thickener that gives gels and creams a smooth, non-greasy feel without clogging pores.
Irritation
low
Source
synthetic
Potassium carbonate is a safe pH adjuster in tiny amounts, but can be irritating if used too high in leave-on products.
Irritation
moderate
Source
synthetic
Potassium Caroate is a strong oxidizer used for bleaching and antimicrobial effects, but it can be irritating and is not common in everyday skincare.
Irritation
high
Source
synthetic
A gentle, plant-derived cleanser that effectively removes dirt and oil without stripping the skin.
Irritation
low
Source
natural
A gentle, plant-derived film former that helps products spread smoothly and leaves a comfortable, non-sticky feel on skin.
Irritation
low
Source
semi-synthetic
A mild, effective emulsifier that creates stable, creamy textures without stripping the skin.
Irritation
low
Source
synthetic
Potassium chloride is a safe, common salt used to adjust product thickness and stability, not a star active ingredient.
Irritation
low
Source
natural
Potassium citrate is a gentle pH adjuster that helps keep your skincare products stable and comfortable on skin.
Irritation
low
Source
synthetic
A gentle, coconut-derived soap ingredient that effectively cleanses without stripping the skin.
Irritation
low
Source
natural
Surfactant
POTASSIUM COCOYL (ARGININE/GLUTAMIC ACID/ISOLEUCINE/LEUCINE/LYSINE/PHENYLALANINE/PROLINE/THREONINE/VALINE)
A mild, amino-acid-based surfactant that effectively cleanses while respecting the skin barrier.
Irritation
low
Source
natural
A mild, amino-acid-based cleanser that effectively removes dirt and oil while respecting your skin's pH and moisture barrier.
Irritation
low
Source
semi-synthetic
A gentle, coconut-derived cleanser that foams well and is ideal for sensitive or dry skin.
Irritation
low
Source
natural
A mild, coconut-derived surfactant that cleanses effectively while being kind to sensitive skin.
Irritation
low
Source
semi-synthetic
A mild, protein-derived surfactant that cleans gently and helps maintain skin and hair softness.
Irritation
low
Source
semi-synthetic
A mild, coconut-derived cleanser that also helps hair and skin feel soft, but its collagen content is too large to penetrate deeply.
Irritation
low
Source
semi-synthetic
A gentle, protein-based surfactant that cleans without stripping the skin, making it ideal for sensitive or dry skin types.
Irritation
low
Source
semi-synthetic
A mild, protein-based surfactant that cleanses without stripping and helps reinforce hair strength.
Irritation
low
Source
semi-synthetic