Glucosamina + condroitina

glucosamine + chondroitin is evaluated for the following indications with varying evidence strength: Knee osteoarthritis (evidence tier D), Anti-aging, longevity, and quality-of-life enhancement in healthy adults (evidence tier F). See the full indication matrix with dosing and citations above on this page.

Common side effects of glucosamine + chondroitin (≥ 1 in 100): Nausea, epigastric discomfort, Diarrhoea or constipation, Heartburn. See the Safety section for uncommon and serious reactions.

FDA category C. Pregnancy data are insufficient. Use in pregnancy and breastfeeding is not recommended without clinical indication.

No data on transfer into breast milk. Use during breastfeeding is not recommended.

glucosamine + chondroitin is contraindicated in: Hypersensitivity to glucosamine or chondroitin; Severe shellfish allergy (glucosamine from crab and shrimp shells); Phenylketonuria (for specific effervescent forms); Severe renal or hepatic impairment. Full list in the Safety section.

direct incorporation into cartilage matrix synthesis is not proven. RCTs assess only clinical effects on pain and function, not structural changes. No conservative intervention “restores” cartilage structure.

the difference between pharmaceutical glucosamine sulphate and over-the-counter glucosamine hydrochloride is substantial. Positive RCTs mainly used the sulphate form at 1,500 mg daily. Hydrochloride in most supplements is a less-studied form with worse results.

even at the correct dose and form, the effect is clinically minor in the general population. ACR 2019 strongly recommends against. Money spent on chondroprotectors is better invested in physical rehabilitation and, when indicated, joint replacement.