I'm assuming CS is cane sugar. It's the closest thing you'll find to nectar. Nectar is mostly sucrose. Cane sugar is mostly sucrose. HFCS is chemically altered corn starch and is 99% fructose. The compound fructose in nectar and cane sugar is not the same compound fructose found in HFCS. HFCS is not good for people, it's not good for pets, how can it be good for bees? :?