Violet Red Bile Glucose HiCynthâ„¢ Agar w/o lactose was designed for the enumeration of Enterobacteriaceae (9). Violet Red Bile Glucose HiCynthâ„¢ Agar w/o Lactose is a modification of Violet Red Bile Glucose Agar wherein animal or vegetable peptones are replaced with chemically defined peptone to avoid BSE/TSE/GMO risks associated with animal peptones.