Natural Breast Enlarging. Yc Breast Cream consists of a proprietary blend of mutagenic herbs and exotic plant extracts that has been proven to increase a womens' breast size naturally. It promotes the growth of breast tissues by balancing the female hormones. Its application boosts the total appearance of the breasts and makes them firm and smooth. How To Use: Gently massage the cream on the entire breast surface from base to top. Massage into the underside of the breast using circular motion for 1-5 minutes from the base surface to the top. Repeat on the outside of the breast with same circular motion, until absorbed into the skin.