Supposedly extracted from the liver of cattle,loaded with vitamins and minerals and amino acids.it was big in the 70s and80s. I was reading about it and was just wondering.maybe now with all the new supplements out there it faded away,plus you seem to get plenty of your aminos from food sources and protein powder or just plain amino acid tabs or powder.if you look back at some of the old iron man mags it was advertised repeatedly like the old weider protein powder.