In 1967 a Japanese analysis of the chemical components of turtle shell found that the abundant chondroitin sulfuric acid distilled from it strengthens the immune system.
日本人在一九六七年針對龜板成分分析指出，龜板煉製的龜膠，軟骨素硫酸特別豐富，可以增強人體免疫機能。