Muscular Development Forums - Powered by vBulletin

Results 1 to 12 of 12

Thread: Insulin Like Growth Factor~IGF 1

  1. #1
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default Insulin Like Growth Factor~IGF 1

    Insulin Like Growth Factor~IGF 1

    by Anthony Roberts - Insulin-like growth factor 1 is a growth factor which is very closely related to insulin. It carries the same amount of amino acids as insulin and responsible for the anabolic reactions to GH. IGF-1 is an important factor in childhood growth and is highly anabolic in adults. It is also known by the brand name Increlex and the generic name mecasermin.

    Background

    In the 1970's, IGF-1 was known as as "Sulfation Factor" and "Nonsuppressible Insulin-like Activity" (NSILA). In the 1980's, it was known as "Somatomedin C." The most popular type of IGF-1 available on the Black Market is a longer lasting version (more amino acids in length) known as Long R3 Insulin-like Growth Factor-I or Long R3IGF-I. Lr3igf-1 is more potent than the lesser versions which are no longer available on the black market. Of that type of IGF, there are two types commonly available (Media and Receptor grades, respectively). These last two types of IGF mostly just refer to the purity of what is actually in the bottle.

    Action

    IGF-1 is released in the liver and binds to the IGF receptors within the cells, which ultimately causes a stimulation of cell growth (both causing new tissue formation and existing tissue growth) and an inhibition of cell death. It is a highly anabolic and anti-catabolic compound. For the athlete or bodybuilder, this had many positive effects: increased nitrogen retention and protein synthesis because it is highly anabolic. IGF-1 (in the presence of sufficient protein) actually promotes growth of new muscle cells, which increases the overall number of cells in the muscle.

    IGF protects the neurons of the brain as well as promotes growth of new motor neurons, making it more possible to rapidly learn new skills during its use. IGF-1 is also responsible in connective tissue production, improves collagen formation and aids in cartilage repair. Similarly, it affects the bones by aiding in bone production and repair.

    Technical Data

    In a study done on young adult mice, a compound responsible for increased secretion of IGF-1 in muscle fibers was administered. There was an average increase of 15% in muscle mass and a 14% increase in strength. When the study was then conducted on adult mice, there was a 27% increase in strength in the injected muscles as compared with non-injected muscles. It was also found to prevent aging of the muscles. Muscle mass and muscle fiber growth were similar to the levels found in young adults. These effects are most likely due to the ability of IGF-1 to activate satellite cells, therefore stimulating muscle rejuvenation (1).

    In studies conducted where GH and IGF1 were used together, a greater increase of Lean Body Mass and fat reduction was found than by use with each compound alone (2). Researches also believe that use of testosterone would also increase IGF levels in muscle (3). In a 12 week study on subjects using IGF-1, IGF-1+GH, or GH alone subjects in this study, gained around 3kgs of lean mass, and lost around 2kgs of fat(4) .

    The complete human IGF-1 Long R3 IGF-1 is 2-3 times more potent than IGF-1 due to less ability to be made inactive by IGF binding proteins (5) (6).

    User Notes

    I’m actually a very big fan of Lr3 IGF-1. For me, I’ve found that it’s had beneficial effects on helping me recover from training injuries and has shown to be very helpful in improving my strength, speed, and performance. I also noted some pretty enhanced muscle building effects and very enhanced fat burning when I’ve been on IGF…nothing on the level of Anabolic Steroids, but still, the effect was very pronounced.
    Most users opt for a dose of about 100mcg/day injected bilaterally in the muscle group just trained, immediately post workout.

    I suspect that in the coming years, more and more professional athletes will be using IGF, as it is very difficult to test for, and many have switched over from GH to this compound already.

    Anecdotally, IGF seems to stack best with Trenbolone and Testosterone, and there’s certainly some synergy between these compounds. Lately, MGF is being added to most IGF protocols. For a fuller discussion of how has been done, check out my article “Peptides: The Next Frontier in Hypertrophy."

    IGF-1 Resources

    IGF-1 Prescribing Information




    References
    1. Viral mediated expression of insulin-like growth factor I blocks the aging-related loss of skeletal muscle function.Proc Natl Acad Sci U S A. 1998 Dec 22;95(26):15603-7.
    2. Recombinant human growth hormone, insulin-like growth factor 1, and combination therapy in AIDS-associated wasting. A randomized, double-blind, placebo-controlled trial. Ann Intern Med. 1996 Dec 1;125(11):865-72.
    3. Am J Physiol Endocrinol Metab. 2002 Mar;282(3):E601
    4. Am J Physiol Endocrinol Metab. 2002 Mar;282(3):E601-
    5. IGF-I variants which bind poorly to IGF-binding proteins show more potent and prolonged hypoglycaemic action than native IGF-I in pigs and marmoset monkeys.J Endocrinol. 1997 Nov;155(2):377-86.
    6. In vivo actions of IGF analogues with poor affinities for IGFBPs: metabolic and growth effects in pigs of different ages and GH responsiveness. Prog Growth Factor Res. 1995;6(2-4):385-95. Review.
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  2. #2
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default

    Recombinant human growth hormone, insulin-like growth factor 1, and combination therapy in AIDS-associated wasting. A randomized, double-blind, placebo-controlled trial.

    Waters D, Danska J, Hardy K, Koster F, Qualls C, Nickell D, Nightingale S, Gesundheit N, Watson D, Schade D.
    Department of Medicine/Endocrinology, University of New Mexico School of Medicine, Albuquerque 87131-5271, USA.



    Comment in:
    OBJECTIVE: To increase lean body mass and improve health status in patients with wasting associated with the acquired immunodeficiency syndrome (AIDS) by treatment with recombinant human growth hormone (rhGH), recombinant human insulin-like growth factor 1 (rhIGF-1), or both. DESIGN: Randomized, double-blind, placebo-controlled clinical trial. SETTING: University of New Mexico Clinical Research Center and University of Texas Southwestern Medical Center. PATIENTS: 60 patients with AIDS and wasting as defined by the Centers for Disease Control and Prevention. Patients were divided into four groups of 15 patients each. INTERVENTION: Group 1 received 1.4 mg of rhGH once daily plus placebo twice daily; group 2 received 5 mg of rhIGF-1 twice daily plus placebo once daily; group 3 received 5 mg of rhIGF-1 twice daily plus 1.4 mg of rhGH once daily; and group 4 received placebo three times daily. MEASUREMENTS: Body weight, body composition, muscle strength, protein catabolism, quality of life, and immune status were assessed at baseline, and changes in these variables were measured at 6 and 12 weeks. RESULTS: At 6 weeks, lean body mass had increased and total fat mass had decreased in the groups receiving rhGH, rhIGF-1, or both. Group 3 had the greatest changes in lean body mass (mean +/- SE, 3.2 +/- 0.59 kg; P < 0.001); only in this group were changes in body mass maintained at 12 weeks. Only patients in group 1 had improvement in muscular strength of the knees and upper body (P = 0.04) and quality of life (P = 0.01). Immunologic function did not improve in any group. CONCLUSIONS: Growth factor therapy had significantly increased lean body mass and decreased fat mass by 6 weeks, but these improvements persisted for 12 weeks only in group 3. Growth factor therapy at the dosages used in this study is not recommended because the magnitude of weight gain was modest and improvements in quality-of-life measures varied.

    PMID: 8967666 [PubMed - indexed for MEDLINE]
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  3. #3
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default

    IGF-I variants which bind poorly to IGF-binding proteins show more potent and prolonged hypoglycaemic action than native IGF-I in pigs and marmoset monkeys.

    Tomas FM, Walton PE, Dunshea FR, Ballard FJ.
    Cooperative Research Centre for Tissue Growth and Repair, Adelaide, South Australia, Australia.

    The relative acute hypoglycaemic potencies of IGF-I and several variants of IGF-I which bind poorly to the IGF-I binding proteins (IGFBPs) have been examined in marmosets (Callithrix jacchus) and the pig. In the marmoset study, IGF-I and des(1-3)IGF-I were compared in anaesthetised and conscious animals in a range of bolus doses from 42 to 270 micrograms/kg body weight. In the pig study, IGF-I was compared with four variants, des(1-3)IGF-I long-IGF-I, R3IGF-I and long-R3IGF-I (LR3IGF-I), which show reduced affinity for the IGFBPs as well as with insulin. Doses in the pig were 20 and 50 micrograms/kg body weight for the IGFs and 3 micrograms/kg for insulin. In each study serial blood samples were taken from 30 min before to 4 h after the bolus injection. Plasma glucose levels were decreased in a dose-responsive manner with the pig more sensitive than either the conscious or anaesthetised marmoset (maximum lowering 4.8, 3.7 and 2.5 mmol/l respectively). The IGF variants were consistently 2- to 3-fold more potent than IGF-I in each animal for lowering of plasma glucose to the nadir, with the potency reflecting the relative affinities for binding to the IGFBPs and the IGF-I receptors. Thus, hypoglycaemic potency was in the order IGF-I < long-IGF-I < R3IGF-I approximately LR3IGF-I < des (1-3)IGF-I. Notably the variants suppressed plasma glucose levels over a much longer period than did IGF-I, the cumulative suppression over four hours showing an approximately 4- to 8-fold increase in the extent of hypoglycaemia. The prolonged suppression was not simply proportional to the hypoglycaemic nadir; at doses equipotent for glucose lowering, the cumulative hypoglycaemic effect for the variants in either species was about 2-fold that for IGF-I. The differential effect of the variants in the marmoset could not be accounted for by correlated changes in plasma insulin, IGF-I or IGFBP levels in plasma. Indirect effects via inhibition of glucagon, or direct effects via hepatic insulin receptors are postulated to account for the results. There was a dose-related reduction in plasma amino acids in the pig but, unlike the case for plasma glucose, only one analogue, LR3IGF-I was more potent than IGF-I. The response to LR3IGF-I was accentuated at the high dosage but on the basis of the other variants tested this effect could not be ascribed to either of the incorporated molecular variations. Despite their more rapid clearance from the circulation, variants of IGF-I which show lower affinity for binding to IGFBPs show proportionately superior potency for sustained hypoglycaemic action. Since our data were obtained in animal models of accepted relevance to humans these results point to the possible superior efficacy of the variants, especially des(1-3)IGF-I, over IGF-I for use as an adjunct to insulin treatment of hyperglycaemic conditions.

    PMID: 9415072 [PubMed - indexed for MEDLINE]
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  4. #4
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default

    In vivo actions of IGF analogues with poor affinities for IGFBPs: metabolic and growth effects in pigs of different ages and GH responsiveness.

    Walton PE, Dunshea FR, Ballard FJ.

    Cooperative Research Centre for Tissue Growth and Repair, Adelaide, Australia.

    IGF-I analogues that bind poorly to IGFBPs are substantially more potent than IGF-I at stimulating growth in rats. However, rodents differ from other mammals because they contain only minimal circulating levels of IGF-II and they are poorly responsive to GH. In this report we review a series of experiments carried out in pigs, a species that is both GH responsive and has high blood concentrations of IGF-II. Intravenous bolus administration of IGFs to 55 kg pigs depressed blood glucose with the potency greatest for analogues such as des (1-3) IGF-I, R3IGF-I and Long R3IGF-I that showed the weakest binding to pig IGFBP-3, a similar efficacy pattern to that reported in the rat. Chronic subcutaneous administration of Long R3IGF-I, however, reduced growth rates, led to a depression in food intake and lowered concentrations of IGF-I, IGF-II and IGFBP-3. IGF-I itself depressed IGF-II concentrations and did not stimulate growth. Subcutaneous infusion of IGFs over a 3-day period, also in 55 kg pigs, demonstrated that analogues that bound least well to IGFBP-3 were the most effective at reducing the concentration of this binding protein, suggesting that the inhibition of growth was related to the depression of IGFBP-3. On the other hand, IGF-I and Long R3IGF-I increased growth rats in neonatal pigs, especially under conditions of reduced food intake. As these anabolic effects occur at a developmental stage where the animals are insensitive to GH in a manner analogous to the situation in rats, it is plausible that the feed-back inhibition of GH secretion explains the catabolic response to IGFs in older pigs.

    PMID: 8817682 [PubMed - indexed for MEDLINE]
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  5. #5
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default

    IGF-1

    Most of the benefits of HGH are derived from IGF-1 including fat loss and lean mass gains. In many ways HGH can be thought of as an IGF-1 precursor. In vivo IGF-1 is created by the metabolization of HGH in the liver.

    The most noticeable short term result of IGF is fat loss. IGF prevents insulin from transporting glucose across cell membranes. As a result the cells have to switch to burning off fat as a source of energy. Other benefits of IGF-1 include:

    •increased amino acid transport to cells
    •increased glucose transport
    •increased protein synthesis
    •decreased protein degradation
    •increased RNA synthesis

    The one limitation of IGF-1 is that its half-life in vivo is extremely short. This limitation is overcome with the creation of synthetic long r3 IGF-1, which has a much longer half-life than both synthetic and endogenous IGF-1. Insulin-Like Growth Factor I, Long R3 is a Synthetic Peptide that is an analog of human IGF-I with a 13 amino acid extension at the N-terminus.

    Long R3 IGF-1 is in sterile lypholized kits with Acetic Acid for dilution. Long R3 IGF-1 is a research peptide and is not intended to treat or cure any conditions and should be used as a research chemical ONLY.

    Steps for Dilution:

    •Each Long r3 IGF-1 kit contains:
    •1000mcg of lypholized Long R3 IGF-1
    •2 CC’s of 0.6% Acetic Acid
    •10 CC’s of IV grade Sodium Chloride

    Step one:

    Remove the tops of the IGF-1 vial and the Acetic Acid

    Step two:

    Dilute the IGF-1 with 2 cc’s of Acetic Acid.

    ***Note: This creates a concentration of 500mcg/ml. So each 1/10 of a CC is 50mcg’s. After dilution store the IGF-1 in the refrigerator at approximately 4 degrees Celsius.

    Step three:

    Draw the desired amount of IGF in to a syringe.

    Step four:

    Draw twice the liquid amount Sodium Chloride in to the same syringe

    Step five:

    Administer to your test subject
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  6. #6

    Default

    Quote Originally Posted by heavyiron View Post
    IGF-1

    Most of the benefits of HGH are derived from IGF-1 including fat loss and lean mass gains. In many ways HGH can be thought of as an IGF-1 precursor. In vivo IGF-1 is created by the metabolization of HGH in the liver.

    The most noticeable short term result of IGF is fat loss. IGF prevents insulin from transporting glucose across cell membranes. As a result the cells have to switch to burning off fat as a source of energy. Other benefits of IGF-1 include:

    •increased amino acid transport to cells
    •increased glucose transport
    •increased protein synthesis
    •decreased protein degradation
    •increased RNA synthesis

    The one limitation of IGF-1 is that its half-life in vivo is extremely short. This limitation is overcome with the creation of synthetic long r3 IGF-1, which has a much longer half-life than both synthetic and endogenous IGF-1. Insulin-Like Growth Factor I, Long R3 is a Synthetic Peptide that is an analog of human IGF-I with a 13 amino acid extension at the N-terminus.

    Long R3 IGF-1 is in sterile lypholized kits with Acetic Acid for dilution. Long R3 IGF-1 is a research peptide and is not intended to treat or cure any conditions and should be used as a research chemical ONLY.

    Steps for Dilution:

    •Each Long r3 IGF-1 kit contains:
    •1000mcg of lypholized Long R3 IGF-1
    •2 CC’s of 0.6% Acetic Acid
    •10 CC’s of IV grade Sodium Chloride

    Step one:

    Remove the tops of the IGF-1 vial and the Acetic Acid

    Step two:

    Dilute the IGF-1 with 2 cc’s of Acetic Acid.

    ***Note: This creates a concentration of 500mcg/ml. So each 1/10 of a CC is 50mcg’s. After dilution store the IGF-1 in the refrigerator at approximately 4 degrees Celsius.

    Step three:

    Draw the desired amount of IGF in to a syringe.

    Step four:

    Draw twice the liquid amount Sodium Chloride in to the same syringe

    Step five:

    Administer to your test subject
    Soooo.... What's your opinion on this stuff? I've read logs all over the internets and it seems that it either works really well or basically nothing at all. Have you administered and what did you think?

    I read a log on another board where a guy ran 40mcg for 25 days and gained 9lbs, put an inch on his arms and lost something like 2-3 inches off his waistline. This was a solo run from a veteran steroid user and did note some strange side effects. Are these types of gains somewhat typical for such a small dose(40mcgs ed)?

  7. #7
    Super Moderator heavyiron's Avatar
    Join Date
    Mar 2008
    Location
    powered by IronMagLabs
    Posts
    18,049
    Gender
    Male

    Default

    Quote Originally Posted by bigal View Post
    Soooo.... What's your opinion on this stuff? I've read logs all over the internets and it seems that it either works really well or basically nothing at all. Have you administered and what did you think?

    I read a log on another board where a guy ran 40mcg for 25 days and gained 9lbs, put an inch on his arms and lost something like 2-3 inches off his waistline. This was a solo run from a veteran steroid user and did note some strange side effects. Are these types of gains somewhat typical for such a small dose(40mcgs ed)?
    I ran anywhere from 50-150mcg's IGF-1 daily. I got great pumps on it but zero weight gain. Since IGF-1 helps with satellite cell production the real changes happen many months after using it. For the money I think I will pass. Mine was free so it was worth it but keep in mind Test or Tren increase IGF-1 levels dose dependantly so a cheap way to increase IGF-1 is a stout Test Tren stack.
    All posts are for entertainment and may contain fiction. Consult a doctor before using any medication.


  8. #8

    Default

    Can you do 25mcg pre workout for the pump and 25mcg post workout?

    What exactly are the fat burning effects? Bc the carbs dont spike insulin sense its bypassed?

    Also theoretically how well would this work with a test/tren/mast combo for pre comp?
    300 pounds is always 300 pounds..... The saddest thing in life is wasted talent...

  9. #9
    Behemoth kentclark's Avatar
    Join Date
    Aug 2009
    Location
    in the ocean, 20 foot waves I’m assuming it’s off the coast of South Africa.
    Posts
    2,081
    Gender
    Male

    Default

    bump for last question

  10. #10
    Nobody
    Join Date
    Aug 2011
    Posts
    3
    Gender
    Male

    Default

    Hey im new to peptides i have hgh fragment 176-191 2 5mg vials, and bac water just not sure how you mix it,and where do you inject it

  11. #11
    Amateur Threat megaguitar01's Avatar
    Join Date
    Nov 2012
    Location
    New Mexico USA
    Posts
    1,634
    Gender
    Male

    Default

    so what do you mean by inject IGF-1 Lr3 bilaterally in muscle? and I've heard of people reconstituting LR3 to regular IGF1 why would they do that

  12. #12

    Default

    Quote Originally Posted by megaguitar01 View Post
    so what do you mean by inject IGF-1 Lr3 bilaterally in muscle? and I've heard of people reconstituting LR3 to regular IGF1 why would they do that
    seeing as u are using slin pins for this most likely (I did) injecting bis, tris, tear drop on quads etc are really easy because of how small pin is(short like 1/4" and like 29g), no pain.
    I personally got rally itchy when done sub-q over abs.....never got itchy from im so that's my preference

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •