Which natural oil should not be used to moisturize the skin?

Which natural oil should not be used to moisturize the skin?
Which natural oil should not be used to moisturize the skin?
Many people only want to use unconventional  “natural” products for skin moisturization. While plant based oils are perceived as safer, this is not always the case. In fact, in a recent review article in the medical journal, Pediatric Dermatology, the dermatologists analyzed the medical literature in terms of the safe application of either olive oil, coconut oil or sunflower oil in the treatment of eczema and, also dry skin in children.
Surprisingly, the researchers found that olive oil should definitely not be used on the skin as a moisturizer or in the treatment of eczema as olive oil may exacerbate or worsen both conditions. 
They suggested further studies needed to be performed to definitively know if coconut oil or sunflower seed oil can be recommended for treating atopic dermatitis or dry skin. 
They did note that coconut oil does decrease water loss from the skin surface after its application and thus appears to aid in skin moisturization.  Coconut oil was found to have high concentration of lauric acid which is antimicrobial and anti-inflammatory, both qualities of potential benefit in eczema.  If coconut oil is considered, than virgin coconut oil should be chosen. Virgin coconut oil simply means that the meat of the coconut undergoes processing within 24 hours of harvest. This prevents the development of fatty acids that in themselves exacerbate or cause skin irritation. 
As for sunflower seed oil, it was found to have high levels of linoleic acid. This natural ingredient helps the upper layer of the skin regenerate and it also hydrates the skin. Sunflower seed oil thus helps restore the disrupted skin barrier as seen in atopic dermatitis. As a consequence, skin inflammation in eczema is reduced leading to quicker resolution of this itchy rash. Perhaps this is why premature infants, who already have a compromised skin barrier, were shown to have a lower death rate when sunflower seed oil was applied to their skin as a moisturizer in a neonatal care unit in Bangladesh.
As an aside, mineral oil is not generally considered as a natural product as it is derived from the distillation of petroleum. It actually should be considered as a “natural” as it is derived from the fossils of ancient marine life like algae and plankton. https://www.livescience.com/3400-chemistry-life-oil.html Mineral oil is an effective moisturizer because it acts as an emollient, moisturizing the skin surface while occluding or acting as a coating on the skin surface therefore leading to less water loss from the skin, thus decreasing dry skin. Incidentally, if you suffer from skin yeast infections such as tinea versicolor, then mineral may be the perfect skin moisturizer, as  mineral oil contains alkanes and cycloalkanes which the skin yeasts can not use as a source of food as opposed to plant oils such as olive oil.
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