Glucosamine hydrochloride originates from seashells. The main function of this ingredient is that it aids arthritis and joint problems (1). This is due to the chemical making a cushion effect around the joint, providing protection for the joint. There is insufficient evidence for this however and more studies are needed in order to fully determine its effects.
1 – Houpt, J. B., McMillan, R., Wein, C., & Paget-Dellio, S. D. (1999). Effect of glucosamine hydrochloride in the treatment of pain of osteoarthritis of the knee.The Journal of rheumatology, 26(11), 2423-2430.