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Q. Liu et al.
9.1.3 ω-3 and ω-6 Fatty Acids
Linoleic acid is a ω-3 fatty acid, a tissue material of ceramide, and a signaling
substance for skin. Linoleic acid and α-linoleic acid (ω-3) are essential fatty acids
for the skin, and they are usually supplied from food. But the oil can penetrate the
skin surface, and the topical swirl can directly affect the lipid layer of the middle skin
to improve the skin’s quality. The ω-6 linoleic acid is particularly important, which
is mainly stored in the nerve amide and cholesterol as a barrier to keep the skin water.
The linoleic acid can also repair dry skin and prevent the skin’s fatty acid levels from
decreasing due to surfactants, resulting in reduced water loss in the deeper layers of
the skin.
The important function of ω-3 fatty acids is to prevent skin inflammation and
sunburn. In general, dietetics suggest that the proportion of nutrition for adults should
be ω-3: ω-6 = 1:2, while the natural proportion for healthy skin is 1:7. AAK deduced
the three grease compounds with the best proportion of ω-3: ω-6. Lipex ω-3:6 the
fatty acid in the product mainly comes from the seeds of camelina camelata; Lipex ωEPO products contained fatty acid from poppy seed oil, and the principal component
is linoleic acid and ω-linoleic acid. Lipex ω-passiflora produces fatty acids from the
herb oil. The advantage of these oils is that they are highly antioxidant [11].
AAK uses 5% or more of the ω-fatty acid in its formula to improve dry wrinkled
skin, such as inherited allergic dermatitis and chronic dry skin. DSM is known as a
producer of vitamins, nutrients, and cosmetic active compounds. The product, Ropufa, which is Borago Officinalis seed oil, contains ω-6 fatty acids extracted from poppies [12]. Jan Dekker also mentions that polyunsaturated fatty acids are as important
as vitamins, mineral salts, and proteins, which are not only for skin liposomes, cell
membranes, but also synthetic substances of hormones and prostaglandins. Prunus
oil, which is extracted from the seeds of the Ente tree, is a natural spice with good
penetration to keep the skin smooth and dry. Its fatty acid composition is similar to
that of Prunus, which is about 70% oleic acid and 20% linoleic acid. The high content
of vitamin E makes it antioxidant [13]. Carapa guaianensis seed oil, produced in the
Amazon region, is often applied to the skin by the locals to repel mosquitoes. It can
prevent skin inflammation and lubricate the skin. Free acids are usually extracted
from ripe fruits, and natural vitamin E is added to improve antioxidant properties.
9.1.4 Vegetable Oils
Vegetable oils come mainly from plant fruits and seeds, also from the leaves, stems,
roots and flowers of plants. Brazilian nut oil from the Amazon is often used locally
as cooking oil and soap. The tree producing Brazilian nut is up to 30 m and the seed
weight is 2.5 kg. Brazilian nuts are the most famous resource in the Amazon and
an important source for antioxidants. Its protein is rich in sulfur, amino acids, and
methionine, especially glutamine, glutamate, and arginine. Chemyunion introduced
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