Solanum lycopersicum (Tomato) Seed Oil is a lipid-rich botanical oil obtained through cold pressing or solvent extraction of tomato seeds, a byproduct of the food-processing industry. Chemically, it is characterized by a high proportion of unsaturated fatty acids, primarily linoleic acid (omega-6) and oleic acid (omega-9), along with smaller fractions of palmitic and stearic acids. The oil is also notable for its naturally occurring carotenoids, particularly lycopene and β-carotene, as well as tocopherols (vitamin E isomers). In skincare formulations, these constituents contribute to antioxidant activity, lipid replenishment, and support of the stratum corneum barrier, helping to counteract oxidative stress induced by UV radiation and environmental pollutants.

In hair-care applications, Tomato Seed Oil functions primarily as a lightweight emollient and conditioning lipid, improving fiber lubrication and surface smoothness without excessive occlusion. Its fatty acid profile allows it to integrate effectively into the hair cuticle lipid matrix, reducing transepidermal water loss from the scalp and decreasing mechanical friction along the hair shaft. Additionally, the presence of carotenoids and tocopherols may help protect both scalp skin and hair fibers from oxidative degradation, which is associated with color fading, protein damage, and reduced tensile strength. These properties make Solanum lycopersicum Seed Oil suitable for inclusion in leave-on treatments, restorative serums, and antioxidant-focused hair and scalp formulations.