After reading this thread, I must say that after seeing Hikari duck and dodge a simple question and give very vague and off point answers, I will never use your products. I have personally fed my fish NLS for 30 days and seen results of active, colorful and happy fish. A friend of mine used NLS exclusively for 30 days and saw the same kind of results. As a consumer I expect honesty from a company that has the reputation Hikari has and you were anything BUT honest in this thread. Again, your answers were vague and off point. Seems you only responded to those that praised your product and not those that had legitimate questions.
I feed my fish frozen, freeze dried and live treats in addition to their staple diet. In bulk, given that a 5 pound bucket can last nearly a year, NLS is far cheaper and far more nutritional to me fish with less fillers in it. Because let's be honest, Hikari products have a lot of fillers. I'm no scientist, but I can look at food labels and know what's thriller and what's filler. I can tell this when I look at organic and non organic foods that humans consume. Also, as an American, I prefer to support an American based company. Hikari is like McDonalds and NLS is like a nice home cooked meal to me.
For those wondering about MSG, which is present in a lot of Hikari's products, Here is it's possibly affects on humans... here is a link about what it can do to humans, sorry, but this makes me not want to use Hikari even more. I imagine these symptoms come from food allergies of some sort. Regardless, it's not something I fully trust to feed my fish.
http://www.mayoclinic.com/health/monosodium-glutamate/AN01251
If this can do that to humans, imagine what it can do to our fish.