Nutrient shelf life?

As per StinkBud, I've been using Botanical nutrients. I initially bought in large quantities and am now using some that are about a year old ...I'm starting to wonder if they are getting past their sell date. I emailed Botanicals w/ this question and they did not respond. Anyone know if and how much they degrade over time?
Thanx, Robert in Arizona

botanicals or botanicare?

Synthetic nutrients should be fine.
as long as there's no preceipitate (solids) forming in there, you should be fine.

Try to store them in a cool,dark place just to be safe

Thanks, CB, for your response. You're right -- it's Botanicare, but their claim to fame is that they are "organic", not synthetic, which was why StinkBud liked them. I did notice that in the Cal-Mag bottle there was a bunch of solid stuff in the bottom of the bottle. Do I need to replace it or just run it through a blender?
Thanks again, Bob