Mod GRF and Sermorelin (I'm assuming the spelling is correct) are different, in that, uhhh, it isn't the modified version - so the previous post does not apply in a way. Sermorelin isn't talked about that much because the modified version is what most people on this board are using.
I've used Sermorelin before, using 200mcg at bedtime for a couple of weeks and didn't notice anything. It might take a longer time to have any effect. I had a slight reaction at the injection site - not as bad as a hive but discoloration that I don't have with my current peptide regimen.
I'm currently using the MOD GRF 1-29, 100 mcg and combining it with 100 mcg Ipamorelin. Used before bed, in the AM before aerobic, and sometimes after weight workouts. I'm cutting it back to only before aerobic, although I will probably miss the effects on nice sleep. It seems to be a bit too strong. There is a huge difference between the two.
I would strongly suggest searching the universe for datbtrue and you will find some professional quality research on peptides discussed in layman's terms. Hope that leads to some pointers that will help more!