What is Glucosamine?
Glucosamine is a popular supplement that has gained widespread recognition for its various health benefits. First synthesized in 1876 by Georg Ledderhose, it wasn’t commercially available until 1939. Initially, it was produced by processing chitin from the shells of shellfish. Today, it can also be derived from the tracheal cartilage of cattle, with reputable manufacturers ensuring this comes from animals not exposed to growth hormones. For vegetarians, glucosamine can be sourced from the fungus Aspergillus niger or through the fermentation of corn.
Glucosamine is an amino sugar, formed in the body from glucose and an amino acid—specifically, glutamine in the case of N-acetyl-glucosamine (NAG). These amino sugars combine to form long polysaccharide chains known as glycosaminoglycans (GAGs), which include glucosamine and chondroitin. These GAGs then bind with fibrous proteins like collagen to create the extracellular matrix, which acts as the structural framework holding cells together in the human body.
Therapeutic Uses of Glucosamine
Osteoarthritis
Osteoarthritis is the most common form of arthritis worldwide and a leading cause of disability, particularly among older populations. As a major component of cartilage and ligaments, GAGs play a crucial role in maintaining joint health. Supplementing with glucosamine provides the necessary nutrients to support the repair of these tissues while reducing inflammation, thus alleviating symptoms of osteoarthritis.
Glucosamine is available in several forms, including sulphate, hydrochloride, and NAG. Among these, the sulphur form appears to be the most effective for managing arthritis, as sulphur is essential for cartilage tissue.
Cancer: Angiogenesis Inhibition
Research has shown that glucosamine, especially in the form of NAG, may help reduce the risk of cancer metastases by inhibiting angiogenesis—the process by which cancer cells grow new blood vessels to supply themselves with nutrients. This mechanism is particularly effective against solid tumours. Studies have highlighted its potential in breast and prostate cancers, where it has been shown to reduce glucose metabolism, slow cell cycle progression, and inhibit cancer cell reproduction.
In prostate cancer, NAG has been found to decrease angiogenesis and invasion, thereby lowering the risk of metastases.
Anti-Inflammatory Effects
Inflammatory cytokines are closely linked to the progression of osteoarthritis and are responsible for much of the associated pain. Glucosamine has been shown to significantly reduce the number of these inflammatory cytokines, offering relief from arthritis-related discomfort.
Repair of Gut Membrane and Microbiota
NAG plays a vital role in maintaining the integrity of mucous membranes in the digestive, respiratory, and urinary tracts. It helps protect against harmful pathogens while allowing essential nutrients to pass through. Individuals with gastrointestinal inflammatory conditions often experience higher turnover rates of their mucous membranes, requiring more NAG to maintain a healthy barrier. However, reduced synthesis of NAG can lead to weakened mucosal layers, contributing to conditions such as “leaky gut,” food allergies, and autoimmune diseases.
Skin Health
When used in topical creams, glucosamine helps reduce wrinkles and age-related brown spots by supporting the repair of connective tissue. It also aids in the healing of scar tissue following surgical procedures.
How to Take Glucosamine
Bioavailability
Studies have measured the levels of glucosamine in synovial fluid and plasma after oral administration. While concentrations increased significantly, they were still lower than what is considered optimal for rebuilding cartilage. However, applying glucosamine as a cream has shown promising results in improving cartilage health.
Dosage
Clinical research indicates that a daily dose of 1500mg of glucosamine is generally safe for use.
Cautions
Although there were initial concerns about glucosamine affecting insulin resistance, subsequent studies found no evidence of this at standard doses. Those with shellfish allergies should opt for non-shellfish-derived glucosamine.
Adverse effects may include stomach upset, constipation, diarrhea, headaches, and rashes. There have also been reports of liver-related issues in some cases. The sulphate form may cause problems for individuals allergic to sulphur, while glucosamine hydrochloride may be better tolerated.
Glucosamine may interact with blood-thinning medications like warfarin. Additionally, due to its potential to inhibit angiogenesis, it is not recommended around the time of surgery, as it may interfere with healing processes.
