I will BUMP for this, I never heard of a post cycle therapy for IGF.
Basically, any hormonal injection will shut you down (at varrying degrees, depending on your use of exogenous compounds, and the nature of said compounds). Test will shut your Hyptotalamic Pituitary Testicular Axis, exogenous Hgh will shut your anterior pituitary gland production, and exogenous igf will shut your hgh production (igf produced in the liver after hgh stimulation).
It all comes down to Homeostasis, and negative feedback.
Homeostasis is one of the fundamental characteristics of living things. It refers to the maintenance of the internal environment within tolerable limits. All sorts of factors affect the suitability of our body fluids to sustain life; these include properties like temperature, salinity, acidity, and the concentrations of nutrients and wastes. Because these properties affect the chemical reactions that keep us alive, we have built-in physiological mechanisms to maintain them at desirable levels.
When a change occurs in the body, there are two general ways that the body can respond. In negative feedback, the body responds in such a way as to reverse the direction of change. Because this tends to keep things constant, it allows us to maintain homeostasis. On the other hand, positive feedback is also possible.
So, injecting igf will shut you down, I don't know to what extent, and I don't know how fast endogenous igf/hgh will get back to homeostasis the natural way (as no research has been conducted on this matter for what I know).
This leads me to my point, reliable sources have indicated that injecting hgh secretagogues such as Hexa, ghrp6, (even cjc, but little plp have experimented with this peptide) as a post cycle igf therapy (this means exactly what it sounds like, post cycle therapy for igf, there is post cycle therapy for test cycles, now you can have your igf post cycle therapy) to help your hgh and igf production get back to your pre-igf level.
Say for example, you are doing a 5 week igf cycle, EOD, bilat, IM, postwo injections. 40:50:60:80:100 (I don't recommand this protocol, but my rat did run it, and I think it is a good one, to assess how you respond to igf, for a first cycle, even a second, or third cycle).
Ok, say your last injection was on friday night, you could do a ghrp6, hexa post cycle therapy.
saturday morning: 300mcg grp6 (hungry, better inject in the morning, although, this could "mess" with your natural hgh production, esp. after a cycle, but most ppl are more than fine, so this shouldn't be a problem). sat eve: 150mcg hexa, both subQ (abdomen will do, it doesn't make much sens to do localized injection with a hgh secretagogue), and you do that for five days ... 2 off, for a total of 3 weeks.
ghrp6 from 100mcg to 600mcg
hexa from 100mcg to 300mcg (my impression (from various readings) is that saturation happens around 3mcg/kg, not 2mcg/kg as you migth have read) ... but that's just sementics, you'll have to experiment, and see for yourself.
If, you were to run only one compound I would do PM (prior bed) injections (seeing as your hgh level will be pretty low, so you would spike your endogenous hgh; hgh production spikes 40 minutes post inject, and drops after 4 hours). Synchronizing your injections with your natural hgh production.
I am looking into GHRP6 because I seriously don't have an apatite at all 
and its really beginning to frustrate me