Cell salts are cold with homeopathy but don't follow the like with like principals. They contain all the trace minerals known to life or something like that. Google has a lot of good links on this.
I tried the bioplasma (all of the salts) but personally didn't have much luck - nothing worse but nothing better.
Years ago there was an excellent thread about cell salts here on mothering. I have been using them since that thread and have found them very helpful. If I get a sore throat and I start on calc sulph it will take it away. Headache or fever- ferrum Phos, Kali mur for mucous and cough, Calc fluor for teeth issues. One other for teeth but forgot the name. I'll try to find the thread. It will help answer questions.