Wassen Silica Evening Primrose Oil Hair Skin & Nails 30 + 30 tablet. Food supplements are intended to supplement the diet & should not be regarded as a substitute for a varied diet. Wassen Silica-EPO is an advanced beauty nourishment regime. Frequent under-nourishment, lack of sleep, stress & busy lifestyle presents itself in poor conditions & structure. Containing Efamol's unique capsules of Pure Evening Primrose oil with 12% GLA & tablets with a complex of essential vitamins & minerals.