Igf and mgf are both involved in hyperplasia(growth of new cells, actually a division). One starts the process and the other finishes it.
Mgf is produced naturally in the body after training. If igf is taken to soon it could blunt the mgf expression.
A good "cycle" for these peptides would be:
Igf DES-pre workout 60-100mcg
MGF- pwo 200 mcg
Igf lr3 60-100mcg 1-2 hours post mgf (training days and non peg mgf days)
Peg mgf 400mcg twice a week non training days.
So if you train M/T/thur/F
M- igf DES / mgf / lr3
T- igf DES / mgf / lr3
W- peg mgf
TR- igf DES / mgf / lr3
F igf DES / mgf / lr3
Sat- either lr3 or peg mgf around noon
Sun- the opposite of what was used sat at around noon to 2pm
This gives each time to work. The try benefit of these will be seen after a few cycles of this combination and adding AAS. The main reason is to induce hyperplasia, then later grow and mature those new cells thru AAS use.
Last year I dosed peg mgf at 500mcg in pecs only for a good amount of time(can't remember but a few vials) along with lr3. Injected pecs daily along with AAS cycle. I added like 1/4 to 1/2 inch to my pecs. It was very noticeable and my woman was constantly talking about how quick they grew. Then a couple weeks after I seemed to have lost every bit of that size. I don't remember exactly what AAS I was on, test and deca or tren, but I'm not sure exactly what happened. I'm not sure if it was somehow holding extra water in the muscle. I was using more peg mgf than people typically use. Either way I had a good cycle but during that time the growth seemed exaggerated but I lost the gain. So must have been water.
But the combination of igf and mgf is a good one and google can provide info as to exactly what each is doing.