A novel fermented ingredient that may offer antioxidant benefits, but research is limited and it's not a proven essential for most routines.
Irritation
low
Source
biotech
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 novel fermented ingredient that may offer antioxidant benefits, but research is limited and it's not a proven essential for most routines.
Irritation
low
Source
biotech
Opal powder adds a soft, natural shimmer to makeup but offers no proven skincare benefits beyond aesthetics.
Irritation
low
Source
natural
A gentle botanical root extract with potential soothing and antioxidant benefits, but research is limited.
Irritation
low
Source
natural
A gentle, semi-synthetic emollient derived from a traditional Asian herb, offering mild skin conditioning with limited but promising research.
Irritation
low
Source
semi-synthetic
A gentle, antioxidant-rich root extract that helps calm irritation and support skin hydration, ideal for sensitive or stressed skin.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant and soothing potential, best for sensitive or dry skin looking for extra comfort.
Irritation
low
Source
natural
A lab-grown plant extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
biotech
Opopanax oil adds a warm, balsamic scent to skincare products and may offer mild soothing benefits, but its fragrance components can be irritating for sensitive skin.
Irritation
moderate
Source
natural
Opopanax Resin Extract adds a warm, balsamic scent to products and may offer mild soothing benefits, but research is limited.
Irritation
low
Source
natural
Orange fiber is a natural, gentle ingredient that helps absorb excess oil and improve product texture without clogging pores.
Irritation
low
Source
natural
A gentle, aromatic flower extract that adds a light citrus scent and mild antioxidant benefits to skincare formulas.
Irritation
low
Source
natural
A gentle, aromatic floral water that adds a light scent and mild soothing feel to skincare products, but offers limited active benefits compared to other ingredients.
Irritation
low
Source
natural
A gentle antioxidant-rich extract that helps protect skin from environmental stress and adds a subtle brightening effect.
Irritation
low
Source
natural
A gentle, natural exfoliant with antioxidant properties, best for those who prefer fruit-based skincare over synthetic beads or harsh acids.
Irritation
low
Source
natural
A gentle, fragrant botanical water that adds a light citrus scent and mild astringency, but offers limited proven skincare benefits beyond hydration.
Irritation
low
Source
natural
Orange juice can offer mild brightening and antioxidant benefits, but its acidity and potential for irritation make it better suited for rinse-off products or well-formulated leave-on treatments.
Irritation
moderate
Source
natural
A mushroom-derived extract with antioxidant potential, but research is limited and it's not a proven skincare powerhouse.
Irritation
low
Source
natural
Orange peel extract offers antioxidant protection and a fresh scent, but its benefits are mild and it may cause sensitivity in very reactive skin.
Irritation
low
Source
natural
Orange Peel Oil adds a fresh citrus scent and mild astringent effect, but can be irritating for sensitive skin and increases sun sensitivity.
Irritation
moderate
Source
natural
A natural, gentle exfoliant with antioxidant benefits, but may cause irritation for sensitive skin due to citrus oils and coarse texture.
Irritation
moderate
Source
natural
Orange Roughy Oil is a moisturizing fish oil that can soften skin, but its sustainability and comedogenic potential are concerns.
Irritation
low
Source
natural
A gentle, antioxidant-rich orchid extract that may help soothe and protect skin, but research is still limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help soothe and protect skin, though research is still emerging.
Irritation
low
Source
natural
A gentle, plant-based antioxidant that may help protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
natural
A gentle orchid extract blend that may offer antioxidant and hydrating benefits, but human studies are limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich orchid extract that may help soothe and protect skin, but research is limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich flower extract that may help soothe and protect skin, though research is limited.
Irritation
low
Source
natural
A gentle botanical duo that may help calm skin and fight free radicals, but research is limited and fragrance-sensitive users should patch test.
Irritation
low
Source
natural
Oregano extract offers antioxidant benefits but can be irritating for sensitive skin due to its potent phenolic compounds.
Irritation
moderate
Source
natural
Oregano flower extract is a gentle antioxidant that may help protect skin from environmental stress, but it is not a substitute for proven treatments.
Irritation
low
Source
natural
Oregano leaf oil is a strong antimicrobial essential oil that can help with acne but is highly irritating and should be used only in very low concentrations.
Irritation
high
Source
natural
Oregano water is a gentle, aromatic hydrosol with antioxidant potential, but its antimicrobial compounds may irritate sensitive skin.
Irritation
moderate
Source
natural
A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant and soothing potential, but clinical evidence in skincare is still limited.
Irritation
low
Source
natural
Oridonin is a plant-based antioxidant with early research suggesting soothing and protective benefits, but it's not yet widely studied in human skincare.
Irritation
low
Source
natural
A plant extract with antioxidant potential, but research on its skincare benefits is still limited.
Irritation
low
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-based oil that helps soften and smooth skin, but research on its specific benefits is still limited compared to more common seed oils.
Irritation
low
Source
natural
A natural balsamic oil that adds a warm, sweet scent to products, but may cause irritation or clog pores in sensitive or acne-prone skin.
Irritation
moderate
Source
natural
A gentle botanical extract with antioxidant and soothing potential, but research is limited and it's not a skincare essential.
Irritation
low
Source
natural
A potent botanical oil with strong antioxidant and antimicrobial activity, best used in low concentrations and with caution for sensitive skin.
Irritation
moderate
Source
natural
A gentle, aromatic floral water that offers mild soothing and refreshing benefits, but its effectiveness is not as well-studied as more common floral waters like rose or chamomile.
Irritation
low
Source
natural
A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
A gentle botanical extract with potential soothing and antioxidant benefits, but research is limited.
Irritation
low
Source
natural
A fragrant, soothing essential oil from a wild chamomile relative, best for those who enjoy natural scents and have non-sensitive skin.
Irritation
moderate
Source
natural
A gentle plant wax that helps soften skin and lock in moisture, ideal for dry or sensitive skin types.
Irritation
low
Source
natural
Ormenis Oil is a gentle, chamomile-like oil that helps calm redness and irritation, making it a good choice for sensitive skin types.
Irritation
low
Source
natural
Ornithine is a gentle amino acid that helps maintain skin hydration and supports a healthy skin barrier.
Irritation
low
Source
natural
Antioxidant
OROSTACHYS JAPONICA CALLUS CULTURE CONDITIONED MEDIA
A gentle, lab-grown plant extract that may help protect skin from environmental stress and support a calmer, more even complexion.
Irritation
low
Source
biotech
A gentle, antioxidant-rich plant extract that may help calm skin and protect against environmental stress, though human studies are limited.
Irritation
low
Source
natural
Orotic acid is a gentle hydrating ingredient with some antioxidant potential, but research on its topical benefits is still limited.
Irritation
low
Source
natural
A gentle botanical extract with traditional soothing and astringent properties, but limited modern research to back strong skincare claims.
Irritation
low
Source
natural
Orris root oil adds a delicate floral scent to products but may cause irritation in sensitive skin; its soothing benefits are not well-proven in modern skincare.
Irritation
moderate
Source
natural
Ortho-phenylphenol is a synthetic preservative that is effective but carries moderate irritation and regulatory restrictions, especially for leave-on products.
Irritation
moderate
Source
synthetic
Orthoclase is a gentle mineral powder that helps absorb oil and improve texture in makeup, but its skincare benefits are minimal.
Irritation
low
Source
natural
Osajin is a plant-derived antioxidant that may help protect skin from environmental stress, but research is still early and it's not widely used in mainstream products.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.
Irritation
low
Source
natural
Osmanthus flower oil adds a lovely floral scent to products, but its skin benefits are not well-studied and it may cause irritation for sensitive skin.
Irritation
moderate
Source
natural
A gentle plant extract that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
natural
A novel, nutrient-dense ingredient that may support skin hydration and barrier function, but clinical evidence is still limited.
Irritation
low
Source
natural