These are pretty useless amino acid containing items extracted from liver. Liver is really a throw away item these days since most people don’t enjoy eating liver. Liver pills are still available and semi-popular, having an almost folk lore status for bodybuilders. Liver has some nutrients and amino acids but is also the filtering point for toxins which are really not good to put back into the body! Liver has a decent amino acid profile, but it really isn’t going to add anything to your body’s ability to put on muscle and has never been shown to increase protein synthesis. Liver tabs really don’t have any scienc behind them and are just low effeciency protein supplements. Although they probably won’t hurt your efforts, they are a waste of money and don’t seem to offer any benefits over standard amino acid or protein supplements. Finally, liver contains a fair amount of iron, which is not necessary for males and can even potentiate heart disease. This alone is a good reason to stay away from liver tabs.