Mr Spud;
I use Epitalon daily for 1 month and take 1 month off on my lab rat. I find that the endocrine system does notice when the Epitalon is no longer stimulating the youthful response and the feeling of age creeps back in at about week 3.5 off cycle.
I believe that over time the rejuvenation process will progress to a point where the return of old age aches etc. do not come back when off cycle for a month.
My rat has been doing the Epitalon for just over 2 years.
It works and your rat will feel the changes that the compound brings about in the Endocrine system. I do not think you can "feel" your Telomeres lengthening but as they do the effect should be that when you break from Epitalon for a month, the feelings of age should not return.
GenScript is the best source in the US that I know of. Sublingual is the preferred route of administration for safety, ease and accuracy of dosage.