What does tortoise shell do?

Tortoise shell is the tortoise shell of Chinese medicine. Its nature is sweet, salty and cold, and it has the functions of nourishing yin and suppressing yang, tonifying kidney and strengthening bones, nourishing blood and strengthening heart. It can be used for treating hyperactivity of yang due to yin deficiency, fever due to yin deficiency, fever due to yin deficiency, weakness of waist and feet due to kidney deficiency, weakness of muscles and bones, infantile fontanelle, palpitation due to heart deficiency, insomnia and amnesia, metrorrhagia due to yin deficiency and blood heat, menorrhagia, etc.