Rebuild supplies a broad spectrum of organ and glandular concentrates. It includes neonatal spleen, heart, pancreas, kidney, brain, liver, adrenal, thymus, pituitary/hypothalamus complex, lung, and intestinal glandulars. Glandulars are prepared strictly from BSE-free countries and collected under USDA inspection. The glandulars in Rebuild incorporate tissues from newborn calves, harvested specifically, to ensure quality and to provide a reproducible source of bovine tissues. Tissues from newborn animals possess high anabolic activity and have had minimal exposure to environmental stressors. Atrophy, fatty infiltration, tissue degradation, and the accumulation of oxidative waste products (lipofuscin) are not observed in tissues from newborn calves. The glandulars are prepared via treatment with mild solvents, and low temperatures; conditions known to preserve enzyme, protein and polypeptide factors.