Linum Usitatissimum (Flax Seed) Oil, also known as linseed oil when extracted from Linum usitatissimum seeds, is an omega-rich botanical oil widely utilized in cosmetic formulations due to its rich composition of polyunsaturated fatty acids, particularly α-linolenic acid (ALA), linoleic acid, and oleic acid. ALA can account for over 50 % of the total fatty acid profile, with other unsaturated lipids further contributing to its skin-nourishing properties. These lipids play an important role in hydrating and conditioning the epidermis, improving moisture retention and barrier support, and assisting in lipid replenishment for compromised or dry skin. Flax seed oil’s emollient effect helps smooth rough or flaky texture, and its antioxidant components such as tocopherols may support resilience against environmental stressors. Consequently, this ingredient is commonly incorporated into facial and body moisturizers, serums, anti-aging creams, and barrier-supporting products targeted at improving softness, suppleness, and overall skin comfort.

In haircare, flax seed oil’s omega-3 and omega-6 fatty acids nourish both the scalp and hair strands by helping maintain lipid balance and moisture levels. Topical use of flax seed oil is associated with conditioning effects, enhancing hair smoothness and shine, while supporting scalp health and minimizing dryness — attributes beneficial for dry, frizzy, or brittle hair types. Some preliminary topical studies suggest potential for improved hair strand thickness and follicle environment, although results vary and further research is recommended to fully establish hair growth effects. Flax seed oil can be formulated into leave-in conditioners, scalp serums, hair masks, and nourishing oils, offering brand owners a plant-derived lipid base that enhances texture, moisture retention, and overall hair manageability.