Glucosamine: Glucosamine is the most studied nutrient when it comes to joint supplements. Studies confirm promising results when glucosamine is given in combination with chondroitin. Besides glucosamine HCL, PharmaQuin is also known to contain N-acetyl D-glucosamine. Methyl Sulfonyl Methane: MSM is a natural form of bioavailable sulphur that is important for the health and elasticity of tendons, ligaments and muscles. It also helps maintain the natural activities of the metabolism. Chondroitin Sulphate: Chondroitin is a natural source of essential amino acids that the body needs for cartilage synthesis and inhibits enzymes that destroy cartilage molecules.