IGF-1 - The Growth Factor of Healing and Rejuvenation

By Lisa Wells, RN


IGF-1 (Insulin-like Growth Factor-1), also known as Somatomedin C is a 70 amino acid protein that is produced mainly in the liver in response to human growth hormone (HGH or GH). IGF-1 is only one of the body's many growth factors. It is a part of the insulin super-family.

Growth factors function similarly to hormones, however hormones usually send long distance messages and the growth factors usually send local messages.

They regulate cell growth and control the metabolic processes. They enable the cells in the hormonal, immune, and nervous systems to communicate and coordinate their growth, death, regeneration, and functioning. Cell reproduction slows down as we age. Unless they are prompted by the growth factors they will go into a resting phase.

IGF-1 is responsible for a wide range of cellular functions and is required for normal growth and health maintenance. These functions include cellular differentiation, transformation, and apoptosis suppression.

IGF-1 helps to transfer glucose through the cell membranes and helps to supply the raw materials that cells need for growth and repair. It also regulates cell growth by moving the cells from the resting phase to the active phase of its cycle and it increases the cell's ability to complete DNA synthesis.

Clinical evidence shows that low IGF-1 levels play a key role in the degenerative changes brought about by the aging process.

The IGF-1 and HGH Connection

About 70% of IGF-1 is produced by the liver in response to human growth hormone, which is produced in the pituitary gland. In fact, the majority of benefits related to HGH are actually brought about as a result of IGF-1 and other growth factors such as IGF-2.

Eric Dupont, Ph.D., says that HGH is the general and IGF-1 and other growth factors are the foot soldiers that work at the cellular level.

By taking IGF-1 directly the pituitary gland and liver are bypassed, which is good if they are damaged or worn out due to aging. Dr. Keith Kelly, Ph.D., who has done much research on anti-aging believes that the real future of anti-aging medicine lies with IGF-1.

The Health and Anti-Aging Potentials of IGF-1

The DNA of cells is constantly being attacked by free-radicals and other environmental factors. It is able to heal itself but this ability decreases with age. Antioxidants have been the only way to help combat this process up until human growth hormone and IGF-1 came on the scene.

Research shows that HGH and IGF-1 can do much more than antioxidants. They can bring the cells the raw materials that are needed for repair. HGH can help to bring amino acids into the cytoplasm of the cell while IGF-1 can deliver nucleic acids into the nucleus of the cell.

The Healing Abilities of IGF-1

IGF-1 is being found to have numerous potential, including healing and rejuvenating the nervous system.

Other research is showing improvements with damaged nerve tissue, brain injury, seizure, stroke, neurodegenerative diseases such as Alzheimer's Disease, Muscular Dystrophy, Multiple Sclerosis, Parkinson's Disease, spinal cord injury, and neuropathies.

Researchers believe that IGF-1 can also stop programmed cell death, and if so it can drastically reduce the damage that occurs after a CVA (stroke) and myocardial infarction (heart attack). For the first time IGF-1 may give us a weapon against death at the cellular level!

Nelly Mauras and Bernard Beaufrere, at the Children's Clinic, Jacksonville, Florida, showed that IGF-1 improves glucose metabolism.2

John Wittig, MD of UCLA has been using IGF-1 to prevent AIDS wasting in HIV infected patients. IGF-1 may allow more aggressive chemotherapy of certain cancers, since drugs like Vincristine and Cisplatin can cause peripheral neuropathies at higher doses.

Phil Micans, of International Aging Systems has predicted that IGF-1 will be the hormone of choice in a few years.

IGF-1 to Repair and Regenerate Nerves

Clinical research has shown that IGF-1 may be used to repair peripheral nerve tissue that has been damaged. If a nerve is torn in a muscle there can be loss of movement. Peripheral nerves have been found to be able to regenerate but usually no more than a couple of millimeters. Research has found that IGF-1 has the ability to repair torn nerves of up to 6 millimeters.1

Swedish scientist Hans-Arne Hansson of the Institute of Neurobiology at the University of Goteborg found that IGF-1 and other growth factors could stimulate even more dramatic regeneration. "IGF-1 by itself and in combination with other growth factors is likely to be of importance in promoting healing and repair processes in clinical practice," he writes.1

In studies of cells in culture and in animals IGF-1 has been shown to have remarkable effects on the spinal cord motor neurons. It increased motor neuron activity in spinal cord cultures by 150 to 270 percent.1

In animal studies IGF-1 has been found to decrease the apoptosis (programmed cell death) that can happen after a CVA (cerebral vascular incident) or MI (myocardial infarction) and enhance the sprouting of axons of the spinal cord motor neurons. IGF-1 was also found to increase intramuscular nerve sprouting ten fold when it was given to normal adult rats. In fact, researchers at Cephalon, Inc., in West Chester, Pennsylvania, believe that IGF-1 may be the "long-sought endogenous motor neuron sprouting factor."1

The possibilities seem endless at this time. If IGF-1 can regenerate spinal cord motor neurons it may be useful in treating amyotrophic lateral sclerosis (ALS), a disease that causes the loss of spinal cord and cortical motor neurons and results in complete paralysis and death. It may also be useful for other peripheral neuropathies.

What About Homeopathic IGF-1?

This is IGF-1 that has gone through the homeopathic process.

Like the injectable form homeopathic IGF-1 works in many different areas of the body to facilitate and improve cellular health and performance. It is believed to bring aging, resting cells back into a balanced state. A recent independent double-blind, placebo-controlled clinical study demonstrated effectiveness in the nervous, reproductive, musculoskeletal, and gastrointestinal systems.

In the study, homeopathic IGF-1 improved energy levels and physical performance, improved respiratory conditions, and even relieved symptoms of PMS and menopause. Homeopathic IGF-1 also relieved muscle and bone aches and pains, as well as joint stiffness and inflammation in the body. Lastly, it improved mental concentration and clarity and positively affected the appetite of the test subjects.

Increases in lean body mass have been reported. Homeopathic IGF-1 balances weight by helping the body to achieve its ideal muscle/fat ratio, whether that means losing fat for people too heavy, or gaining muscle for people too lean.

Dr. Howard Davis believes that because HGH and IGF-1 work so closely together in the body they make a great team when used together in a homeopathic system.6

Human growth hormone seems to be a "night hormone" and IGF-1 a "day hormone" (one reason why both are needed), so the two could work synergistically and catalytically in the body.6

Related Information

Normal IGF-1 Blood Test Levels

The Body's Wonderful Growth Factors!

Double-Blind Placebo IGF-1 Clinical Studies Done on ProBLEN HGH

The IGF-1 Clinical Studies of Other Brands of Products

Growth hormone and IGF-1


1. Klatz, Ronald, Grow Young With HGH, HarperPerennial, 1997.

2. Nelly Mauras, Kimberly O. O'Brien, Susan Welch, Annie Rini, Kevin Helgeson, Nancy E. Vieira, Alfred L. Yergey, Insulin-Like Growth Factor I and Growth Hormone (GH) Treatment in GH-Deficient Humans: Differential Effects on Protein, Glucose, Lipid, and Calcium Metabolism, The Journal of Clinical Endocrinology & Metabolism, Volume 85, Issue 4, 1 April 2000, Pages 1686-1694, doi: 10.1210/jcem.85.4.6541

3. Clemmons, D., Clinical utility of measurements of insulin-like growth factor 1. Nat Rev Endocrinol 2, 436-446 (2006). doi: 10.1038/ncpendmet0244

4. Tillmann, V, Patel, L, Gill, MS, Whatmore, AJ, et al, "Monitoring Serum Insulin-Like Growth Factor-1 (IGF-1), IGF Binding Protein-3 (IGFBP-3), IGF-1/IGFBP-3 Molar Ratio and Leptin During Growth Hormone Treatment For Disordered Growth," Clinical Endocrinology, September 2000, Vol 53, Issue 3, Pages 329-336.

5. Cutfield W, S, Lundgren F: Insulin-Like Growth Factor I and Growth Responses during the First Year of Growth Hormone Treatment in KIGS Patients with Idiopathic Growth Hormone Deficiency, Acquired Growth Hormone Deficiency, Turner Syndrome and Born Small for Gestational Age. Horm Res 2009;71(suppl 1):39-45. doi: 10.1159/000178036

6. Davis, Howard A, Feeling Younger With Homeopathic HGH - The Leading Edge For Anti-Aging, Safe Goods, 1998.