According to pharmokinetics SQ has slightly better Bioavailibility!
also SQ produced a sustained spike in serum GH,it's dose deppendent and showed better results in research.
The trick with rHGH is that by it self it's useless!It stimulates the liver to produce IGF-1 which is the effective form,,A sustained spike in serum GH results in more IGF-1 than that of a larger spike that fades more quickly!
That's why peptides to be effective it needs to be pinned very frequent to be able to sustain a decent serum GH,While a single shot of 100mcg GHRP2/mod GRF can produce a serum GH equivalent to 10ius of pure rHGH,It's peak flattens very quickly and best case would give you a serum IGF-1 between 300-400!
SQ rHGH 5IU/day can give you IGF-1 upto 800-900!
So it's how long GH stays in blood not how much!SQ produces a sustained release effect due to the fact that HGH is BULKY and diffuse slowly from the site of injection.