I'll second that.
I only got cramp occasionally before Helvellyn Tri one year, and then at the foot of the Struggle, when I stood on the pedals for the first time, my quads just stopped and I had to hang on to a wall to stay upright... couldn't get off the bike for an embarrassing couple of minutes...
...anyway, NUUNs are worth every penny and the cramp (whilst a very occasional annoyance) has been 99% sorted. Certainly worth a go.
How's it all going Em?