Our first human GHRP-6 studies in normal young men were performed in collaboration with Michael Thorner (Bowers et al., 1990). These studies (Fig. 1.7, left panel) revealed that iv bolus GHRP-6 released GH and, when given together with GHRH, released GH synergistically. One of the most characteristic and consistent in vivo actions of GHRPs in various animals as well as humans of both sexes and all ages is the synergistic release of GH when GHRP is administered concomitantly with GHRH by iv bolus. Subsequently, this was also found for continuous 24/7 subcutaneous (sc) infusion. Also recorded in Fig. 1.7, right panel, is the comparative GH-releasing effects of iv bolus GHRP-6, -1, -2, and GHRH in normal young men. The potency of the three GHRPs we developed over several years was increasingly effective in releasing GH, and each released more GH than GHRH in normal young men. In addition, this was also found to occur in normal young women (Bowers, 1996).
Growth hormone-releasing peptides (GHRPs) constitute a group of small synthetic peptides that stimulate the growth hormone secretion and the downstream axis activity. Mounting evidences since the early 1980s delineated unexpected pharmacological cardioprotective and cytoprotective properties for the GHRPs. However, despite intense basic pharmacological research, alternatives to prevent cell and tissue demise before lethal insults have remained as an empty niche in the clinical armamentarium. Here, we have rigorously reviewed the investigational development of GHRPs and their clinical niching perspectives.
Peptide therapy, or the use of specific peptides in treatment, has gained great popularity in recent years. This is due largely to the fact that these peptides are highly specific (i.e., only do what you want them to do) while also being well-tolerated and safe. As of January 2015, there were over 60 US FDA-approved peptide medications, 140 peptide drugs being evaluated in clinical trials, and 500 in pre-clinical development.
GHRP-6 brings about the effects you’d expect from heightened Growth Hormone and IGF-1 levels; increased fat loss and muscle building. It’s worth remembering that Growth Hormone and IGF-1 will not only promote greater muscle hypertrophy (enlargement of existing muscle fibres) but will also cause muscle hyperplasia – an increase in the actual number of muscle cells.
Django Nathan, a medical doctor with a degree in molecular biology and genetics, takes peptides because of his busy lifestyle: "Quite a few doctors I know are using them because they have so many beneficial effects and so few side effects. We're not elite athletes – we live rushed lives that can involve 70 hour weeks so staying fit and getting good sleep is essential – and peptides aid that."
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