Therapeutic Effect of Vitamin C Supplementation in Patients With Ovarian Aging：a Multicenter, Double-blind, Randomized Controlled Trial

The goal of this clinical trial is to learn if Vitamin C works to improve ovarian reserve in women with ovarian aging. It will also learn about the safety of Vitamin C. The main questions it aims to answer are: * Does Vitamin C supplementation improve the ovarian reserve prediction score? * What medical problems do participants have when taking Vitamin C supplementation? Researchers will compare Vitamin C to a placebo (a look-alike substance that contains no drug) to see if drug Vitamin C works to improve ovarian reserve in women with ovarian aging. Participants will: * Take Vitamin C or a placebo every day for 12 months * Visit the clinic once every 4 weeks for follow-up and drug distribution. * Return the Vitamin C box at each visit. * Report any adverse effects of treatment to the doctor. * Fill out a questionnaire at each visit. * After 6 months and 12 months of intervention, take blood test and ultrasonic examination.