Fragrances can be used in almost all personal care, hair care and cosmetic formulations. They are typically a blend of natural oils and aroma compounds. Most fragrances are undiluted and have not been cut with solvents and therefore very little is used in formulations. You would typically use 0.1-0.5% fragrance in creams, shower gels, bubble bath and lotions and up to 3% in soaps.