Glucosamine
Absorption. Bioavailability of glucosamine with oral administration is 25% (the effect of "first passage" through the liver).
Metabolism. After absorption of the oral dose, radiolabeled glucosamine initially found in the plasma and later penetrates into the tissue. The highest concentrations are found in the liver, kidneys and articular cartilage. About 30% of the dose is persistently persistent in the tissues of bones and muscles.
Elimination. It is excreted mainly by the kidneys in unchanged form; partially through the intestine. The half-life of the drug is 68 h.
Chondroitin sulfate
Absorption. When chondroitin sulfate is administered orally at a dose of 0.8 g (or twice a day 0.4 g), the plasma concentration increases for 24 hours. Absolute bioavailability is 12%.
Metabolism. It is metabolized by desulfurization.
Elimination. It is excreted by the kidneys. The half-life is 310 min.