Evening Primrose Oil is widely used as a base oil in aromatherapy, massage both in hair and skin. It’s known for its Conditioning and Nourishing properties. Oenothera Biennis (Evening Primrose) Oil Apply a small amount of oil to the skin or to the scalp and massage. Precautions: Keep out of reach of children. Avoid contact with eyes. If contact occurs, rinse well with water. Discontinue use if irritation occurs. Keep it in closed and store in a cold place.