Evening Primrose Oil is sourced from the seeds of the Evening Primrose plant. There are two main types of Evening Primrose Oil; one is extracted using chemical solvents, whilst the other is extracted by mechanically pressing the oil from the seeds. Appearance: Fluid Liquid Color: Clear, light yellow to pale yellow Odor: Characteristic mild odor Relative Density: 0.923 Refractive Index: 1.474 Peroxide Value: 1.3 Unsaponifiable Matter: 1.1 Acid Value: 0.9 GLA Content: 10.9% Uses:- Evening primrose oil is used for skin disorders such as eczema, psoriasis, and acne. Cancer. Acne. Multiple sclerosis (MS). Heart disease. Alzheimer s disease.