Effect of Vitamin D on Skeletal Muscle Function and Qol in Patients With Chronic Intestinal Failure/Insufficiency

Inclusion Criteria: 1. Informed consent was obtained from patients or their legal representatives for participation in this study 2. Patients 18 years of age or older, under 70 years of age, chronic intestinal failure/insufficiency 3. Serum 25(OH)D level \< 30.0 ng/ml 4. Vital signs are stable Exclusion Criteria: 1. Those who did not meet the inclusion criteria, or who were deemed unfit by their physician to participate in this study 2. Primary hypothyroidism or parathyroidism 3. Patients suffering from allergic diseases, are allergic, have a history of drug sensitivity similar to the structure of the study drug 4. Patients with primary diabetes 5. Patients with mental illness, inability to cooperate or consciousness disorders 6. Patients with contraindications of experimental drugs 7. Patients with a suspected or confirmed history of substance abuse 8. Immune deficiency, use of immunosuppressants and hormones 9. Pregnant and lactating women 10. Have taken any vitamin D supplements in the last 6 months 11. Have taken any medication in the last 6 months that affects vitamin D metabolism (e.g., phenytoin, phenobarbital, rifampicin) 12. Patients who participated in a drug trial (including the drug in the trial) within 3 months before the trial 13. Sponsors or investigators directly involved in the trial or their family members 14. The researcher believes that there is any reason not to be accepted