Technologies and additives that will provide a metabolic shift and change body condition are of interest to increase productivity. Porcine somatatropin has been know to increase protein and decrease fat deposits, but requires injection which is not as practical as an oral compound would be. Some of the new technologies and additives being studies include Cysteamine, chromium, lecithin, betaine, immunization against GnRF, and neuroleptics. Cysteamine increases the release of somatotropin by inhibiting somatostatin secretion, and various studies have found increases in average daily gain, final live and carcass weights, feed intake, nitrogen retention, and decreased back fat depth. Addition of chromium to feed is proposed to increase insulin sensitivity, manipulate fat deposition, and have varied effects on growth rate and average daily gain. The varied results are thought to be because of the uptake factors, like digestibility and absorption, of particle size. Lecithin contains the phospholipid polyenylphosphatidylchlorine (PPC), which may be able to decrease cross-linking in collagen. Decreased cross-linking would lead to reduced or softer collagen, and a decreased toughness in final pork products. Bentaine increases protein deposition and reduces maintenance energy, which results in better growth performance and decreased heat production.Immunization against GnRF is an alternative to surgical castration, and it still avoids boar taint. The immunized, intact males have also shown increased feed intake, weight (live and carcass), and average daily gain when compared to barrows. Recent studies of the dietary neuroleptics magnesium, trytophan, and bromide have shown variable results on growth. There are a variety of oral additives and technologies being developed to change pig composition, and provide a more desirable pork product.