Hypovitaminosis C Prevalence and Risk Factors in an Acute Geriatric Unit

"If the patient consents to participate in the study, a 4-mL blood sample will be collected and performed when the patient enters the unit. No other sample will be taken, and the participation of the patient to the study will end after the result of the test or after the end of the vitamin C supplementation. A telephone call is organized to follow up on any adverse effects.~The blood sample will be collected up to 3 days after admission"