 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | R | S | T | U | V | W | X | Y | Z |
| O-cymen-5-ol Preservative used in cosmetics. |
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| Oatmeal Can have anti-irritant and anti-inflammatory properties. |
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| Octyldodecyl neopentanoate A skin-conditioning agent and emollient. |
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| Oleic acid A fatty acid used as a surfactant and thickening agent. |
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| Oleic/linoleic triglyceride Used as an emollient and thickening agent in cosmetics. |
| Oleths Mild surfactants. |
| Olive oil An excellent addition to products for mature or dry skin. Olive oil is a good antioxidant and is a good moisturizing ingredient. It is suitable for use in the treatment of scalp conditions and dry skin. |
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| Olive oil PEG-6 esters Used as an emollient and thickening agent in cosmetics. |
| Orange blossom Fragrant extract that can also be a skin irritant. |
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| Orchid Fragrant extract that can be a skin irritant. |
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| Oregano Has potent antibacterial and antifungal properties, but can also be a skin irritant. |
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| Oryzanol Component of plants and their products, such as rice bran, that has potent antioxidant properties. |
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| Osmanthus Fragrant plant; used in perfumes, it can also be a skin irritant. |
