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CLINICAL KNOWLEDGE MAGAZINE
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Set Off on the Quest for Glucosamine and Chondroitin!
Mateusz Pawlak
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Diets Premium Medical Expert • 18.03.2026
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Scientifically reviewed by a clinical dietitian:
This article has been peer-reviewed for adherence to IŻŻ, WHO, and PTGiP clinical nutritional standards.
| CLINICAL KNOWLEDGE MAGAZINE CLINICAL KNOWLEDGE MAGAZINE | min read 6 min |
| Diets Premium Medical Expert Mateusz Pawlak | Scientifically reviewed by a clinical dietitian 18.03.2026 |
Key Takeaways
In our movement system, we can distinguish mobile connections, which are also known as joint connections. Although they are capable of withstanding extensive damage and pressure, they start to wear out over time, resulting in a decline in the functionality of the entire movement system.
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What is glucosamine?
Glucosamine is the name of an amino sugar that is an organic chemical compound and a derivative of glucose. This supplement is naturally found in the human body and in shellfish. In the human system, it can be found mainly within the cartilage and joints. The most common forms of this compound are hydrochloride and glucosamine sulfides.
Action of glucosamine
Glucosamine and N-acetylglucosamine are utilized for the restoration of joint elements within the body and the reduction of discomfort induced by overload or vigorous physical exertion. A substantial risk of joint damage exists due to excessive weight, a diet deficient in calcium, or injuries. Try this product: FitLabs Flexogenic - 400g. Check now! Glucosamine is responsible for the synthesis of proteoglycans, which are the primary building blocks of joint cartilage. A deficit of these substances results in pain during movement, diminished shock absorption, heightened susceptibility to injuries, and a decline in movement quality. Glucosamine is well tolerated by the body, and its application in the form of sulfate yields the most therapeutic benefits. This form of glucosamine boasts the highest bioavailability, enabling almost 90% of the active substance to enter the bloodstream.
Side effects
in sports supplementation and medical treatment. Glucosamine is one of the key treatment points for degenerative joint diseases and mineral loss, which are not only caused by injuries or damage, but also by age or hormonal changes. In summary, glucosamine supplementation is beneficial for: combating joint pain and stiffness; strengthening bone tissue synthesis; preventing bone demineralization; protecting and reinforcing joint connections; regenerating cartilage; improving shock absorption, quality, elasticity and mobility. However, it is worth noting that glucosamine is a substance that is generally well tolerated by our body. However, as with most supplements, there is a risk of unwanted side effects. These side effects usually occur as a result of inadequate supplementation with this preparation (e.g. overdosing, exceeding the recommended dose) or an allergy to seafood (most products containing this compound use shellfish shells). It is also worth mentioning that diabetics should consult with their doctor about including glucosamine in their supplementation, as this preparation may affect insulin levels in the blood.
Dose allocation
The most frequently observed unwanted side effects in glucosamine supplementation are diarrhea, abdominal pain, bloating, and constipation. Allergic reactions such as nausea, vomiting, or skin redness may also occur. The recommended daily dose of glucosamine should range from 900 to 1500 mg and should be divided into three portions. The efficacy of the product depends on the dose taken. Supplementation should be carried out with a meal. There are different opinions on the effectiveness of glucosamine in the scientific community. Below we present a few studies that confirm and question the effectiveness of this agent.
What is chondroitin?
In almost 50% of the tested individuals, in comparison to the initial number of individuals reporting the occurrence of this symptom, chondroitin is regarded as a chemical compound belonging to the mucopolysaccharides group, composed of the residues of glucuronic acid and other constituents.
Action in progress
N-acetyllactozoamine is an endogenous compound that is produced by our body. Its main source is joint cartilage. Chondroitin's greatest efficacy is observed in the form of sulfate, which plays a critical role in reducing the sensation of friction between joint surfaces. Additionally, chondroitin naturally stimulates the body to produce joint fluid, which is responsible for the proper functioning of the joints. Because of this, their structure is not destroyed, and the quality and mobility of the movement performed remain at an appropriate level. A popular solution is the combination of chondroitin with vitamin C, because it allows our body to receive information about increasing collagen production - a compound that determines the durability of our anatomical structures, such as ligaments or joint capsules, which are responsible for control and movement. However, it is important to note that chondroitin is an endogenous compound, meaning it is produced by our body. However, constant use and continuous wear of cartilage tissue result in the produced amount being insufficient to meet the daily requirement of this nutrient.
Dosing of chondroitin supplements
In circumstances where chondroitin is delivered through natural food, questions often arise. In reality, chondroitin is primarily found in beef and shark cartilage. However, due to the limited availability of these products, it is more often recommended to use supplements that contain chondroitin in their composition. It is assumed that the daily dose of such supplements ranges between 0.5 g and 4 g. We often encounter preparations that are specific conglomerates of three compounds: chondroitin + glucosamine + vitamin C. This is an excellent solution, as such a combination requires a more comprehensive and holistic approach to movement apparatus protection, and also provides effective protection against potential injuries.
Mateusz Pawlak
Diets Premium Medical Expert
Member of the Diets Premium clinical editorial board. Specializes in medical diet therapy, metabolic health, and nutritional planning.
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