Refining and Purity The quality of the mineral oil used in skincare is a critical factor in its safety profile. Chemically inert, meaning it does not react with other substances, mineral oil creates a semi-permeable barrier on the surface of the skin.
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It is particularly beneficial for those with extremely dry, flaky, or compromised skin barriers. It is also a common and safe ingredient in medical settings, used to protect skin during oxygen therapy and to prevent adhesives in wound dressings from sticking to healing tissue.
The risk of breakouts is significant if the formula is not specifically designed to be non-comedogenic. Crude petroleum contains impurities, including potential contaminants like polycyclic aromatic hydrocarbons (PAHs), which are classified as carcinogens.
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Its molecular structure is relatively large, which means it sits on the surface rather than penetrating deeply. This occlusive property is the reason it is so effective at preventing transepidermal water loss (TEWL), which is the process by which skin loses moisture to the air.
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