A gentle lipid that may help strengthen the skin barrier and improve hydration, but research is still early.
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 lipid that may help strengthen the skin barrier and improve hydration, but research is still early.
Irritation
low
Source
natural
An experimental ingredient with potential for light-activated delivery, but very limited safety and efficacy data in everyday skincare.
Irritation
moderate
Source
semi-synthetic
A gentle phospholipid that helps reinforce the skin's natural barrier and may calm sensitivity.
Irritation
low
Source
semi-synthetic
A mild, lipid-based ingredient that supports the skin barrier and helps keep moisture in without clogging pores.
Irritation
low
Source
semi-synthetic
Lysozyme is a gentle enzyme that helps control unwanted bacteria on the skin, making it a mild alternative to harsher antimicrobial ingredients.
Irritation
low
Source
natural
Lysyl Ornithine is a gentle, amino-acid-based ingredient that may help calm irritated skin, but research is still early.
Irritation
low
Source
semi-synthetic
M-Aminophenol is a synthetic dye ingredient used in hair color to achieve cool, ashy tones, but it can be a skin irritant and allergen for some people.
Irritation
moderate
Source
synthetic
M-Aminophenol HCl is a synthetic dye ingredient used in permanent hair color to create cool, ashy shades, but it can be a skin irritant for some people.
Irritation
moderate
Source
synthetic
A synthetic hair dye intermediate that helps create cool, ash tones in permanent color, but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
M-Cresyl Acetate is a synthetic fragrance ingredient that adds a sweet, floral note to products, but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic film-former that helps products spread evenly and feel smooth, but with limited published safety data.
Irritation
low
Source
synthetic
M-Hydroxyanisole is a synthetic fragrance and antioxidant ingredient that can help stabilize formulas but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that is increasingly restricted due to potential skin sensitization and reproductive toxicity concerns.
Irritation
moderate
Source
synthetic
M-Tolualdehyde is a synthetic fragrance compound that adds almond-like notes but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.
Irritation
low
Source
natural
A gentle plant extract that may help calm skin and fight free radical damage, though research is still early.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research is limited and benefits are not yet well-established in human skin.
Irritation
low
Source
natural
A gentle botanical oil with antioxidant potential, but research on its specific benefits for skin is still limited.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is still early — it's more of a supporting ingredient than a star performer.
Irritation
low
Source
natural
Maackiasin is a plant-derived antioxidant that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
natural
A gentle, water-based botanical blend that may offer antioxidant and soothing benefits, but research is limited.
Irritation
low
Source
natural
Maca root powder is a gentle, antioxidant-rich botanical that may help soothe and protect skin, but research on its topical benefits is still limited.
Irritation
low
Source
natural
A mild, coconut- and macadamia-derived surfactant that cleanses gently, making it a good choice for sensitive or dry skin.
Irritation
low
Source
semi-synthetic
A gentle, water-friendly emollient that softens skin without feeling greasy, but the PEG modification may raise concerns for some sensitive users.
Irritation
low
Source
semi-synthetic
A gentle, fatty-acid-rich extract that hydrates and softens skin without clogging pores.
Irritation
low
Source
natural
A non-greasy, nutrient-rich oil that hydrates and softens skin without clogging pores, ideal for dry or mature skin.
Irritation
low
Source
natural
A gentle, semi-synthetic emollient that softens skin without clogging pores, ideal for sensitive and dry skin types.
Irritation
low
Source
semi-synthetic
A gentle, non-greasy emollient that mimics the skin's natural lipids to improve softness and barrier function.
Irritation
low
Source
semi-synthetic
A lightweight, non-greasy emollient that hydrates and helps blend oil and water in formulas, with a very low risk of irritation.
Irritation
low
Source
semi-synthetic
Emulsifier
MACADAMIA SEED OIL POLYGLYCERYL-6 ESTERS BEHENATE
A gentle, plant-based emulsifier that helps create stable, creamy textures while leaving skin feeling soft.
Irritation
low
Source
semi-synthetic
A gentle, natural exfoliant that sloughs off dead skin cells without harsh microplastics, but may feel too gritty for sensitive skin.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research on its benefits for skin is still limited.
Irritation
low
Source
natural
A nourishing plant butter that softens and hydrates skin without feeling overly greasy, but research on its specific benefits is still limited.
Irritation
low
Source
natural
A promising antioxidant from nutmeg that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
natural
Mace oil adds a warm, spicy scent to products and offers antioxidant benefits, but its potency means it can irritate sensitive skin if used too strong.
Irritation
moderate
Source
natural
A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research on human skin is still limited.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.
Irritation
low
Source
natural
A gentle, non-greasy oil that helps soften and soothe skin, but research on its unique benefits is still limited.
Irritation
low
Source
natural
A plant-based antioxidant extract that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
natural
A plant-based antioxidant extract that may help soothe and protect skin, though research is still emerging.
Irritation
low
Source
natural
A gentle, antioxidant-rich fruit extract that may help protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research is limited and it's not a powerhouse ingredient on its own.
Irritation
low
Source
natural
A gentle botanical powder with traditional soothing and antioxidant potential, but scientific research on its cosmetic benefits is still limited.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant that may help calm skin and fight environmental stress, but research is still early.
Irritation
low
Source
natural
Madecassic acid is a soothing, skin-repairing compound from Centella asiatica that helps calm irritation and support the skin barrier.
Irritation
low
Source
natural
A gentle, research-backed soothing ingredient from cica that helps calm redness and support skin repair without irritation.
Irritation
low
Source
natural
A gentle, fermented cleansing ingredient that removes dirt without stripping the skin.
Irritation
low
Source
biotech
A gentle botanical extract that may help calm skin and provide antioxidant support, but research is still early.
Irritation
low
Source
natural
A gentle, lab-grown lily extract that may help calm skin and fight environmental stress, but research is still early.
Irritation
low
Source
biotech
Antioxidant
SACCHAROMYCES/LILIUM CANDIDUM CALLUS EXTRACT FERMENT EXTRACT FILTRATE
A gentle, biotech-derived ingredient that may help calm and protect skin, though human studies are still limited.
Irritation
low
Source
biotech
A gentle botanical extract that may help calm skin and provide antioxidant support, though research on its cosmetic benefits is still limited.
Irritation
low
Source
natural
A gentle, lightly astringent floral water that adds a subtle lily scent and soothing feel to skincare products, but has limited research on specific skin benefits.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant that may help protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
biotech
Madrox is a little-known ingredient with minimal published research; its benefits are unclear and it may be a trade name for a blend.
Irritation
low
Source
mixed
A gentle plant extract with antioxidant potential, but research is limited—think of it as a supportive, not star, ingredient.
Irritation
low
Source
natural
A gentle pH adjuster that helps keep your skincare products stable and skin-friendly, but offers no direct skin benefits.
Irritation
low
Source
synthetic
A gentle antioxidant that pairs magnesium with a modified amino acid to help protect skin from environmental stress and support a healthy-looking complexion.
Irritation
low
Source
semi-synthetic
A safe mineral stabilizer and absorbent used in many cosmetics, but not a star active ingredient.
Irritation
low
Source
synthetic
A safe, multi-mineral powder that helps control shine and improve product texture without common irritation concerns.
Irritation
low
Source
synthetic