... .5% (Feed Grade) L-Lysine Sulphate 65% (Feed Grade) L-Lysine Sulphate 70% (Feed Grade) Both are ... highly purified to 98% after fermentation. L-Lysine Sulphate, which is more cost-effective, is semi-purified ... could attribute 78.4% free lysine and L-Lysine Sulphate 65%, equal to 65% lysine HCl, could provide ... 51% free lysine in the feed. And L-Lysiine Sulphate 70%, equal to 70% lysine HCl, could provide ...