Results obtained from animals under tropic conditions showed that weight increase using Modivitasan was higher than those reported by similar tests using anabolic drugs (Rodriguez, 1989, Duran et al., 2005). Modivitasan does not have withdrawal period for milk or meat, due it is completely harmless for animals and people, and its components are indispensable nutrients for the animals and do not have collateral eect. A study carried out in grazing animals at the tropic by the Veterinary Institute of Tropical and Highlands Research from The Veterinary Medicine School of the University “ Universidad Nacional Mayor de San Marcos (UNMSM)” proved Modivitasan ecacy through an increase in meat production with a weight increase higher than 44% compared to animals without treatment.