Nail board refers to tortoise shell, and vinegar nail board refers to tortoise shell made of vinegar. Nailing refers to tortoise shells, and nailing with vinegar refers to tortoise shells made of vinegar. Carapax Trionycis: nourishing yin and suppressing yang, clearing away heat and steaming, softening and resolving hard mass. It can be used for bone steaming, hyperactivity of liver yang, asthenic wind, amenorrhea, malaria and abdominal mass. Modern applications: hepatosplenomegaly, serum globulin is inversely proportional to albumin, hepatitis, cirrhosis, nephropathy, sores, purpura, tumor.

Tortoise shell: nourishing yin and suppressing yang, tonifying kidney and strengthening bones, consolidating menstruation and stopping bleeding, nourishing blood and calming the nerves. It can be used for treating night sweat due to bone steaming, dizziness, headache, insufficient internal wind, soreness of waist and knees, incomplete fontanel closure, metrorrhagia, palpitation and insomnia, amnesia, etc. Modern applications: rickets, uterine bleeding, neurasthenia, hyperthyroidism, tuberculosis, diabetes, dysplasia, hypertension, arteriosclerosis, oligospermia, nephritis.