Peptides are the newly emerging science of cell signaling amino acid sequences, with far-reaching regulatory and rejuvenation actions on neuro-endocrine-immune functionality. The specifically targeted use of peptides in the environment has the potential to rewrite bodily chemistry relationships, and ultimately generate a restorative trend towards anabolism and homeostasis. Peptides can also be utilized and applied in the treatment of injuries, with capabilities that help prevent aging, illness, and enhance peak performance.
What is Growth Releasing Peptide Therapy?
A peptide is a short chain of amino acids that are linked together, and can be thought of as a small protein. To date, over 7,000 naturally-occurring peptides have been identified. In our bodies, these small proteins typically act as signaling molecules. They bind to receptors on the cell surface and tell other cells and molecules what to do.
Growth Releasing 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.
Most of these peptide drugs are administered intradermally, but can also come in the form of transdermal creams, nasal sprays, and oral tablets.
Because these peptides are so numerous and variable in structure, their effects are likewise varied and wide-ranging. One class of these peptides are known as growth hormone secretagogues, and cause the secretion of one’s own, natural hGH in the body. These peptides have been shown to be very useful in the treatment of age-related conditions, osteoporosis, obesity, and various chronic inflammatory diseases, and have several advantages over traditional hGH administration.
Another type of peptide drug is composed of part of the hGH molecule that is responsible for fat cell death, and has been shown to be very effective as an anti-obesity drug. In addition to decreasing inflammation, these drugs lead to increased lean muscle mass and decreased body fat.
A certain class of peptide drug has been used to help prevent skin cancer by increasing the melanin in one’s skin, causing a darkening effect that mimics a quality sun tan. This peptide has also been shown to increase lean muscle mass and improve sex drive.
This class of peptides includes several therapeutics that stimulate growth hormone (hGH) secretion. Each peptide varies slightly as far as structure and mechanism of action. Thus, a certain peptide may be preferred depending on the patient’s health status and desired outcome. GHSs include: CJC 1295, GHRP 2, GHRP 6, Hexarelin, Sermorelin and Ipamorelin.
This particular peptide offers therapeutic benefits similar to those of hGH. CJC 1295 is a growth hormone releasing hormone (GHRH) analogue. In other words, it is a molecule that serves the same purpose as does GHRH—the hormone that stimulates the anterior pituitary to release hGH. However, unlike GHRH, which has a half-life of only minutes after IV administration, CJC 1295 is able to remain active in the body for extended periods due to its ability to bind to a protein in the blood known as albumin and avoid degradation by various enzymes. CJC 1295 increases an important growth factor, IGF-1, in addition to hGH, leading to fat loss, lean muscle growth, and enhanced sleep.
Growth hormone releasing peptide (GHRP) 2 is a type of peptide therapeutic that mimics the effects of ghrelin, the “hunger hormone”. Ghrelin is a hormone that helps regulate appetite as well as energy distribution and rate of use, or metabolism. In the 1980’s, ghrelin was discovered to be the body’s natural ligand (or binding molecule) of the GHRP receptor in the anterior pituitary. This was a significant discovery, as it highlighted the role of ghrelin in hGH secretion and growth regulation. Modern biotechnology has used this knowledge to develop peptides that can be administered to mimic ghrelin’s hGH stimulation, but in a more targeted fashion. GHRP 2 is one such peptide, stimulating hGH secretion by 7-15 times, increasing appetite and meal initiation, while also decreasing fat mass and cholesterol. GHRP 2 is ideal for patients who are hypercatabolic, due to critical illness, cancer, AIDS, etc. It should be noted that GHRP 2 can also increase levels of prolactin, aldosterone, and cortisol.
Similar to GHRP 2, this peptide is a more potent releaser of growth hormone, also acting on the ghrelin receptors of the anterior pituitary. Also like GHRP 2, GHRP 6 leads to increased growth hormone production, increased lean body mass, and decreased adiposity. Due to the peptide’s ghrelin-like properties, administration can lead to increased appetite.
Hexarelin is a peptide that is derived from GHRP 6, but has been optimized to enhance its metabolic stability. Like the other GHSs, hexarelin increases hGH production, resulting in increased muscle mass, bone density, skin elasticity, and decreased body fat. Unlike the other GHRPs, however, hexarelin does not lead to a substantial increase in ghrelin and therefore does not cause the same appetite stimulation. This peptide has been further promoted for its cardioprotective and regenerative action as well. Hexarelin would be an ideal choice for those looking to benefit from increased growth hormone without appetite stimulation.
Ipamorelin stands out among other GHSs due to its enhanced specificity. This peptide generates similar increases in growth hormone secretion, but without the appetite stimulation and increase in cortisol, acetylcholine, prolactin, and aldosterone seen with other peptides in its class. This peptide has been found to be very well-tolerated.
Also known as GRF 1-29, is a Growth Hormone Releasing Hormone (GHRH) produced by the brain that stimulates the production and release of Growth Hormone (GH). Sermorelin Acetate was first developed in the 70s, which is thought to be the shortest fully functional fragment of GHRH and has been used as a test for Growth Hormone secretion. It is often used extensively in Anti-aging Therapy along with Testosterone in men. Sermorelin Acetate affects a more primary source of failure in the GH neuroendocrine axis, has more physiological activity, and its use for adult hormone deficiency is not restricted. Compared to human Growth Hormone (hGH), Sermorelin Acetate is a growth hormone secretagogue, which means that it stimulates the pituitary gland to produce and secrete growth hormone. Also, Sermorelin Acetate and Modified GRF 1-29 contains 29 amino acids whereas hGH is a larger molecule containing 191 amino acids. Click here to learn more about Sermorelin Therapy
This peptide is a modified fragment of hGH which contains the portion of the molecule that is believed to be responsible for hGH’s anti-obesity effects. The peptide has been shown to increase fat burning without the increase in blood sugar and growth rate that has been seen with hGH itself. AOD 9604 has been deemed safe for chronic use by the FDA, receiving Human GRAS status in 2014. In addition to its utility as an anti-obesity peptide, AOD 9604 has been shown to have very favorable cartilage repair and regenerative properties, especially when paired with peptide BPC 157.
Melanotan II is an analogue of alpha melanocyte stimulating hormone, the hormone responsible for pigmentation in skin and hair. This peptide has been shown not only to increase skin pigmentation, resulting in a substantially tanner skin tone, but also to stimulate fat loss and increase libido. Its aphrodisiac effects were so substantial that it was the basis for the development of another peptide designed exclusively to address erectile and sexual dysfunction—Bremelanotide PT 141.
Bremelanotide PT 141 was developed from Melanotan II, targeting its aphrodisiac effects. This peptide has been shown to have a substantial effect on libido, generating sexual arousal in both men and women within minutes of administration. It has been shown to be effective in treating erectile dysfunction, even in men who have not responded to other ED treatments, such as Viagra. This peptide is also able to cross the blood-brain-barrier, bypassing the vascular system and acting at the level of the central nervous system. This property gives Bremelanotide an advantage over traditional ED drugs, which can decrease blood pressure to dangerous levels. This peptide can be administered as a nasal spray, making its use convenient and discreet.
These peptides are inhibitors of a protein called myostatin. Myostatin is secreted by muscle cells and acts to essentially block the development of new muscle fibers and, thus, the development of lean muscle mass. In fact, individuals who have mutations in the gene coding for this protein have significantly more muscle mass and enhanced strength. The administration of follistatin peptides can generate enhanced muscle mass and strength, and has been found especially useful in patients suffering from muscle-wasting diseases or who have difficulty gaining muscle.
SARMs are selective androgen receptor modulators. Androgens are naturally occurring hormones—such as testosterone—that regulate the development and maintenance of male sex characteristics. SARMs provide the benefits of anabolic steroids (i.e., increased muscle mass/strength, fat loss, increased bone density, increased libido) without the quantity and/or severity of unwanted effects. SARMs are not toxic to the liver, separating them from most oral steroids and making them an attractive treatment option to those looking to benefit from anabolic steroid drugs.
MGF stands for mechano growth factor—a peptide derived from insulin-like growth factor-1 (IGF-1), which plays a large role in childhood development and continues to have anabolic effects throughout adulthood. MGF has the ability to encourage repair and growth of wasted tissue through the activation of muscle stem cells, thereby increasing the synthesis of proteins necessary for tissue growth. This peptide is ideal of anyone suffering from muscle loss, either due to old age or a particular condition (i.e., HIV, cancer, etc.)
Cerebrolysin—also known as FPE 1070—is a synthetic nootropic drug. Nootropic drugs are substances that enhance cognitive functions such as memory, creativity, and motivation in otherwise healthy individuals. This peptide is extremely small, allowing it to penetrate the blood-brain barrier and act directly on the neurons of the central nervous system. Cerebrolysin has been found to improve the metabolic activity of brain tissue, shield neurons from harmful substances, and stimulate the peripheral and central nervous systems. In addition to its utility as a nootropic substance, the drug has potential as part of a treatment plan addressing Alzheimer’s disease, stroke, and moderate to severe head injury.