From the standpoint of protein synthesis and muscle repair, IGF-1 injections have also been shown to enhance the anticatabolic effects of insulin and to increase the protein synthesis normally induced by growth hormone. This is because, like insulin, IGF-1 encourages amino acid uptake into muscle cells, stimulates peripheral tissue uptake of glucose (which lowers blood glucose levels), and suppresses liver glucose production. That last fact is important and is actually why IGF-1 is even being considered as a diabetes-prevention drug. Insulin resistance can cause the liver to produce excess glucose, which then causes even more insulin insensitivity and can eventually result in type II diabetes, and IGF-1 can decrease the need for this type excessive insulin release.
Y.-T. Shen, J. J. Lynch, R. J. Hargreaves, and R. J. Gould, “A growth hormone secretagogue prevents-ischemic-induced mortality independently of the growth hormone pathway in dogs with chronic dilated cardiomyopathy,” Journal of Pharmacology and Experimental Therapeutics, vol. 306, no. 2, pp. 815–820, 2003. View at Publisher · View at Google Scholar · View at Scopus
A SARM (an acronym for "Selective Androgen Receptor Modulator") is a drug that is chemically similar to anabolic steroids but with reduced androgenic properties. The main advantages SARMs have over anabolic steroids are androgen-receptor specificity, tissue selectivity, and reduced side effects. SARMs also have the ability to differentiate between anabolic and androgenic activities, whereas steroids do not.
Evidence review and acceptance by the NDPSC in 2007, demonstrated that paracetamol/caffeine combination analgesics have a very low risk of nephrotoxicity. Similarly, the combination analgesics pose a very low risk of toxicity in overdosing with only two fatal cases reported in the USA. However, these cases involved other medications in addition to paracetamol/caffeine with the latter being available in very large pack sizes. Further, there are no known contraindications to the paracetamol/caffeine combination apart from hypersensitivity to the constituents."
Although the history of some of the foremost biomedical discoveries is permeated by serendipity,4 we deem that the well-established pivotal role of the GH/insulin-like growth factor-1 (IGF-1) axis for cardiomyocyte physiology, and the subtle alterations of this axis within the pathogenicity of dilated cardiomyopathy (DCM) and left ventricular (LV) dysfunction, ignited the idea of assessing the potentiality of GHRP to alleviate cardiac pathologies.5 It was far to be anticipated on those early days, however, that the GHRP-mediated cardiotropic and cytoprotective effects are superior to those shown by the exogenous administration of GH and are not shared by GH-releasing hormone (GHRH) and that, importantly, GHRPs exert their pharmacological actions via GH-independent pathways that obviously represented another turning point in this history.3
Essentially a synthetic version of ghrelin analogue, GHRP-6 (like GHRP-2) stimulates the release of an endogenous growth hormone (GH) within the somatotropes of the anterior pituitary in the animal and human body. Specifically, GHRP-6 will increase the number of somatotropes in a GH pulse by limiting the amount of somatostatin present, while standard GHRH increases the amplitude at which the pituitary cells pulse. Unlike ghrelin, GHRP-6 is not specifically used to increase appetite, but it may have secondary actions that impact hypothalamic neurons. These effects last for approximately an hour after the initial application, which mimics the natural application of GH, and consists of an eight hour circulation period.
A peptide is an amino acid chain (amino acids being the building blocks of proteins), responsible for signalling different responses in the body. These amino chains already exist in the body in one form or another, which is why some consider them as ‘natural’ compounds (although testosterone exists in the human body too, adding extra is considered cheating in most cases). Peptides have been classified in research and manufacture according to a number sequence in many cases, which is why some are just numbers and letters (see later).
For example, there are Growth Hormone Releasing Peptides (GHRP’s with names such as ipamorelin and hexarein) which allow for a slow and steady growth hormone release that produces a pulse which mimics natural growth hormone release times and Growth Hormone Releasing Hormones (GHRH’s such as Mod-GRF) for an even stronger natural release of growth hormone and greater presence of growth hormone precursors known as GH “frags” or fragments.
A remarkable specific (125)I-Tyr-Ala-hexarelin binding was observed in the human cardiovascular system where the highest binding levels were detected in ventricles, followed by atria, aorta, coronaries, carotid, endocardium, and vena cava. In other experiments on H9c2, cardiomyocyte-specific GHRP binding was found along with a potent antiapoptotic activity.3 The primarily investigated receptor was the growth hormone secretagogue receptor type 1a (GHS-R1a), which was detected in isolated human cardiomyocytes, myocardium, and aorta samples.17 It has been recently shown that GHS-R1a is a sort of “promiscuous receptor” involved in many systems and behavioral patterns such as reward, feeding, and memory, which makes it an attractive pharmacological target.18 Years later, the synthetic GHRP hexarelin was acknowledged as a ligand of another protein identified as CD36, a scavenger receptor that is expressed in various tissues, including monocytes/macrophages and the endothelial microvasculature. Activation of CD36 in perfused hearts by hexarelin was shown to increase coronary perfusion pressure in a dose-dependent manner. Contrariwise, this effect was lacking in hearts from CD36-null mice and hearts from spontaneous hypertensive rats genetically deficient in CD36.19,20 Thus, it is currently accepted that two cardiac receptor subtypes mediate the pharmacological actions of GHRP-6, GHRP-2, and hexarelin.21,22
GHRP-6 stands for growth hormone releasing hexapeptide, so it is obviously a peptide hormone. As you can probably guess, it acts in the same manner as all peptides do in the Growth Hormone (GH) class – it increases the amount of GH our bodies produce. This is a very beneficial property, as growth hormone is the fountain of youth, and serves many purposes from fat loss, to muscle gain and anti-aging effects. For this reason many athletes have turned to GHRP-6 in order to get an athletic edge.
Years ago, our group examined the cytoprotective effects exerted by the GHRP-6 preventive administration in the hepatic tissue subjected to I/R, as in other distal organs from the ischemic site (ie, lungs, kidneys, and small intestine). Histological and biochemical results allowed us to conclude that the pharmacological preconditioning induced by the GHRP-6 treatment attenuated I/R liver damage. Besides respiratory distress syndrome like pulmonary changes, intestinal transmural infarct and acute tubular necrosis in kidneys were significantly reduced. These results indicated for the first time a systemic cytoprotective effect for the GHRP-6, suggesting its potential efficacy to control the inflammatory response associated with acute I/R and shock, which eventually originated multiple organs damage (MOD). Cytoprotection induced by GHRP-6 treatment was also related to the attenuation in the generation of ROS and preservation of the antioxidant defense reserves. Histological analysis as the assessment of myeloperoxidase activity evidenced a clear anti-inflammatory GHRP-6-induced effect in the liver and remote organs. Moreover, the molecular mechanism mediating the action of GHRP-6 peptide was shown to involve the phosphatidylinositol 3-kinase/RAC-alpha serine/threonine-protein kinase (PI-3K/AKT1) pathway, as the induction of the hypoxia-inducible factor-1 alpha (HIF-1α) all committed in cellular survival.51 Subsequently, Granado et al52 examined the potential anti-inflammatory impact of GHRP-2 in lipopolysaccharide (LPS)-challenged rats. GHRP-2 administration attenuated the effects of LPS on the elevation of circulating levels of transaminases, nitrites/nitrates, and tumor necrosis factor-alpha (TNF-α), via direct interaction with liver nonparenchymal cells. Globally, the exogenous administration of these two synthetic GHRPs appeared to exert a potent hepatoprotective role by attenuating the inflammatory response orchestrated by liver-resident macrophages. Another line of evidences document the benefits of 15-daily injections of GHRP-2 (100 μg/kg) in arthritic rats, so that the treatment ameliorated the external symptoms of arthritis and decreased the circulating levels of interleukin 6 (IL-6) as the nitrite/nitrate release from peritoneal macrophages in vitro. This experiment extrapolated the counter-inflammatory properties of GHRP-2 to a nonepithelial organ and suggested again a direct interaction with ghrelin receptor of immune cells.53 Similarly, effects have been attributed to ghrelin by inhibiting the inflammatory response via AKT1-activated pathway with a concomitant reduction of myeloperoxidase activity, the rate of apoptosis, and oxidative stress.54 All these data suggest that GHRPs exert a mutually inclusive beneficial effect by directly protecting parenchymal organs epithelial cells, and simultaneously by modulating the magnitude of the inflammatory response by direct interaction with the effector immune cells. Supporting the protective effect of GHRP-6 on epithelial organs, a recent study has excellently described and dissected the mechanistic bases on how GHRP-6 prevented gastric mucosal damage induced by water immersion restraint (WRS) and other forms of stress. The data indicated that the protective effect of GHRP-6 on WRS-induced gastric mucosal injury is somehow mediated by peripherally suppressing the vagal efferent effect on the stomach, including gastric acid secretion. Although more studies are clearly demanded, the present findings open the possibility to use GHRP-6 in preventing Curling ulcers.55
Ghrelin is a 28 amino acid hunger-stimulating peptide and hormone that is produced mainly by P/D1 cells lining the fundus of the human stomach and epsilon cells of the pancreas. Ghrelin together with obestatin is produced from cleavage of the ghrelin/obestatin prepropeptide (also known as the appetite-regulating hormone or growth hormone secretagogue or motilin-related peptide) which in turn is encoded by the GHRL gene. Ghrelin receptors are expressed in a wide variety of tissues, including the pituitary, stomach, intestine, pancreas, thymus, gonads, thyroid, and heart. The diversity of ghrelin receptor locations suggests ghrelin has diverse biological functions.
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Abbreviations: AKT1, RAC-alpha serine/threonine-protein kinase; AMI, acute myocardial infarction; CTGF, connective tissue growth factor; DCM, dilated cardiomyopathy; dP/dt, the rate of left ventricle maximal pressure rise in early systole; DX, doxorubicin; ECM, extracellular matrix; EGF, epidermal growth factor; ERK1/2, extracellular signal-regulated kinase 1/2; GH, growth hormone; GHRH, growth hormone-releasing hormone; GHRPs, growth hormone-releasing peptides; GHS, growth hormone secretagogues; GHS-R, growth hormone secretagogue receptor; GHS-R1a, growth hormone secretagogue receptor type 1a; HIF-1α, hypoxia-inducible factor-1 alpha; I/R, ischemia and reperfusion; IGF-1, insulin-like growth factor-1; IL-1β, interleukin-1 beta; IL-6, interleukin 6; LPS, lipopolysaccharide; LV, left ventricle; LVEF, left ventricular ejection fraction; MBP, mean blood pressure; MIF, macrophage migration inhibitory factor; MCP-1, monocyte chemoattractant protein-1; MMP, matrix metalloproteinase; MOD, Multiple Organs Damage; NEP, nitrosylation end products; NIH, National Institute of Health; PDGF, platelet-derived growth factor; PGC1α, peroxisome proliferator-activated receptor gamma coactivator 1 alpha; PI-3K, phosphatidylinositol-4,5-bisphosphate 3-kinase; PPARγ, peroxisome proliferator-activated receptor gamma; RAS, rennin–angiotensin system; rhGH, recombinant human growth hormone; ROS, reactive oxygen species; TGF-β, transforming growth factor beta; TIMP, tissue inhibitor of metalloproteinase; TNF-α, tumor necrosis factor alpha.
SARMS: Selective Androgen Receptor Modulator which means they are synthetic drugs that stimulate the androgen receptor for specific task such as muscle growth, fat loss and recovery. What makes SARMs so special is they don’t have heavy side effects like steroids, a good analogy commonly used to describe the difference is watering your garden. Sarms are a hose that target specific parts of the garden for specific results, steroids are a thunderstorm that water your garden as well, but blow over pots, flood the house and turn your lawn into a mudpit.
Everybody has unique goals and these are best adjusted by your dosages. Research in The Journal Of Clinical Endocrinology & Metabolism found 100mcg will saturate all your receptors, but taking 200mcg will cough up an additional 50% of effectiveness, where as 300mcg delivers just a 25% of an additional boost. So the law of diminishing returns is firmly in place with this peptide. What’s more, higher doses were found in a study in The Journal Of Clinical Endocrinology & Metabolism to increase people’s stress hormone, cortisol in doses over a 100mcg so if you do decide to delve into this supplement, stick to the lower doses.