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IGF-1 LR3 1mg
IGF1-LR3 is a modified version of insulin-like growth factor-1. The full name of the peptide is insulin-like growth factor-1 long arginine 3. For laboratory research use only. Not for human consumption.
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Research Peptides
Research Capsules

Source: PubChem
Cell Division
Like IGF-1, IGF1-LR3 is a potent stimulus for cell division and proliferation. Its primary effects are on connective tissues like muscle and bone, but it also promotes cell division in liver, kidney, nerve, skin, lung, and blood tissues. IGF-1 is best thought of as a maturation hormone because it not only promotes cell proliferation, but differentiation as well. IGF-1 causes cells to mature, in other words, so that they can carry out their specialized functions. Unlike IGF-1, IGF1-LR3 remains in the bloodstream for long periods of time. This property makes IGF1-LR3 a much more potent molecule. A dose of IGF1-LR3 provides approximately three times as much cell activation as a similar dose of IGF-1. Note that IGF1-LR3 and all IGF-1 derivatives do not promote cell enlargement (hypertrophy), but rather promote cell division and proliferation (hyperplasia). In the case of muscle, for instance, IGF1-LR3 does not cause muscle cells to get larger, but it does increase total numbers of muscle cells.Fat Metabolism and Diabetes
IGF1-LR3 boosts fat metabolism in an indirect manner by binding to both the IGF-1R receptor and the insulin receptor. These actions increase glucose uptake from the blood by muscle, nerve, and liver cells. This results in an overall decrease in blood sugar levels, which then triggers adipose tissue as well as the liver to begin breaking down glycogen and triglycerides. Overall, this produces a net decrease in adipose tissue and a net energy consumption (i.e. net catabolism). Given its role in reducing blood sugar levels, it should come as no surprise that IGF1-LR3 reduces insulin levels as well as the need for exogenous insulin in diabetes. In most cases, this translates into a 10% decrease in insulin requirements to maintain the same blood sugar levels. This fact may help scientists understand how to decrease insulin doses in individuals who have decreased insulin sensitivity and may even offer insight into preventing type 2 diabetes in the first place.Impairs Myostatin
Myostatin (a.k.a. growth differentiation factor 8) is a muscle protein that primarily inhibits the growth and differentiation of muscle cells. While this function is important to prevent unregulated hypertrophy and ensure proper healing following injury, there are times when inhibiting myostatin could be of benefit. The ability to stop myostatin from functioning could be useful in conditions like Duchenne muscle dystrophy (DMD) or in people who suffer muscle loss during prolonged immobility. In these cases, inhibiting this natural enzyme could help to slow muscle breakdown, maintain strength, and stave off morbidity. In mouse models of DMD, it has been found that IGF1-LR3 and other IGF-1 derivatives are capable of counteracting the negative effects of myostatin to protect muscle cells and prevent apoptosis. IGF1-LR3, thanks to its long half-life, is highly effective in counteracting myostatin and appears to work by activating a muscle protein called MyoD[1], [2]. MyoD is the protein normally activated by exercise (e.g. weight lifting) or tissue damage and is responsible for muscle hypertrophy.IGF1-LR3 Longevity Research
IGF1-LR3 promotes tissue repair and maintenance throughout the body, making it a protective molecule against cell damage and the effects of aging. Research in cows and pigs indicates that IGF1-LR3 administration may be an effective solution for offsetting the effects of cellular aging. Ongoing research in mice seeks to determine if IGF1-LR3 might be useful in preventing progression of a wide range of conditions such as dementia, muscle atrophy, and kidney disease. This research reveals that IGF-1 administration can prolong life and reduce disability[3], [4], [5, p. 1].
Lifespan of male and female mice is correlated with IGF-1 levels. Source: ResearchGateGlucocorticoid Signaling
Glucocorticoids, secreted primarily by the adrenal glands, are important clinical drugs used to control pain and reduce inflammation in autoimmune diseases, neurological injury, cancer, and more. Unfortunately, glucocorticoids have a number of undesirable side effects such as muscle wasting, fat gain, and deterioration of bone density. There is some interest in using IGF1-LR3 to reduce the side effects of glucocorticoids and thus allow for more effective therapy[6]. IGF1-LR3 exhibits minimal to moderate side effects, low oral and excellent subcutaneous bioavailability in mice. Per kg dosage in mice does not scale to humans. IGF1-LR3 available from Peptide Custom is limited to educational and scientific research only, not for human consumption. Only buy IGF1-LR3 if you are a licensed researcher.- “Adipose Tissue-Derived Stem Cell Secreted IGF-1 Protects Myoblasts from the Negative Effect of Myostatin.” [Online]. Available: https://www.hindawi.com/journals/bmri/2014/129048/. [Accessed: 16-May-2019].
- N. Li, Q. Yang, R. G. Walker, T. B. Thompson, M. Du, and B. D. Rodgers, “Myostatin Attenuation In Vivo Reduces Adiposity, but Activates Adipogenesis,” Endocrinology, vol. 157, no. 1, pp. 282–291, Jan. 2016.
- E. Corpas, S. M. Harman, and M. R. Blackman, “Human growth hormone and human aging,” Endocr. Rev., vol. 14, no. 1, pp. 20–39, Feb. 1993.
- W. E. Sonntag, A. Csiszar, R. deCabo, L. Ferrucci, and Z. Ungvari, “Diverse roles of growth hormone and insulin-like growth factor-1 in mammalian aging: progress and controversies,” J. Gerontol. A. Biol. Sci. Med. Sci., vol. 67, no. 6, pp. 587–598, Jun. 2012.
- “IGF-I/IGFBP system: metabolism outline and physical exercise. - PubMed - NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/22714057. [Accessed: 16-May-2019].
- B. Y. Hanaoka, C. A. Peterson, C. Horbinski, and L. J. Crofford, “Implications of glucocorticoid therapy in idiopathic inflammatory myopathies,” Nat. Rev. Rheumatol., vol. 8, no. 8, pp. 448–457, Aug. 2012.
- A Philippou, A Halapas, M Maridaki, M Koutsilieris - J Musculoskelet Neuronal Interact, 2007 [Semantic Scholar]
- A Philippou, E Papageorgiou, G Bogdanis, A Halapas… - In vivo, 2009 [Iiar Journals]
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Storage Instructions:
All of our products are manufactured using the Lyophilization (Freeze Drying) process, which ensures that our products remain 100% stable for shipping for up to 3-4 months.
Once the peptides are reconstituted (mixed with bacteriostatic water), they must be stored in the fridge to maintain stability. After reconstitution, the peptides will remain stable for up to 30 days.
Lyophilization is a unique dehydration process, also known as cryodesiccation, where the peptides are frozen and then subjected to low pressure. This causes the water in the peptide vial to sublimate directly from solid to gas, leaving behind a stable, crystalline white structure known as lyophilized peptide. The puffy white powder can be stored at room temperature until you're ready to reconstitute it with bacteriostatic water.
Once peptides have been received, it is imperative that they are kept cold and away from light. If the peptides will be used immediately, or in the next several days, weeks or months, short-term refrigeration under 4C (39F) is generally acceptable. Lyophilized peptides are usually stable at room temperatures for several weeks or more, so if they will be utilized within weeks or months such storage is typically adequate.
However, for longer term storage (several months to years) it is more preferable to store peptides in a freezer at -80C (-112F). When storing peptides for months or even years, freezing is optimal in order to preserve the peptide’s stability.
For further information on proper storage techniques, click the link below:



