Good question. They always seem to say you should cycle it, whatever it is. The trouble with peptide research is that there is no golden egg at the end of the rainbow. Big pharma wants to make billions and peptides cant be patented. Therefore there is no money for research. I haven't used epitalon but have used some other peptides
People who sell peptides say cycle them probably because most things are not good to take all the time, things like test for example. Most medicines are given for a short time to clear an infection or resolve what the issue was. If it doesn't work for a long time, they assume it didnt work and try some thing else. Many drugs do lose effectiveness over time and may need larger doses, things like cocaine. You will just have to wait and see if it keeps working