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Effect of Vitamin C Supplementation in Diabetes

Effect of Vitamin C Supplementation on Total Blood Antioxidant Capacity and Some Periodontal Indices in Patients with Type 2 Diabetes: A Randomized Controlled Trial

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
IRCT
Registry ID
IRCT20251214068335N1
Enrollment
80
Registered
2026-01-03
Start date
2025-12-26
Completion date
Unknown
Last updated
2026-02-02

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Type 2 Diabetes. Diabetes mellitus due to underlying condition

Interventions

Intervention 1: Intervention group: Participants in this group will receive one tablet containing 1000 mg of vitamin C (ascorbic acid) daily for four consecutive weeks. The tablets will be administere

Sponsors

Birjand University of Medical Sciences
Lead Sponsor

Eligibility

Sex/Gender
All
Age
30 Years to 65 Years

Inclusion criteria

Inclusion criteria: Diagnosis of type 2 diabetes based on ADA criteria (HbA1c = 6.5% or fasting plasma glucose = 126 mg/dL), with an HbA1c range of 6.5% to 9%, indicating relatively controlled glycemic status. No use of antioxidant or vitamin supplements during the previous 3 months. No history of acute infectious or inflammatory diseases within the past 1 month. No history of chronic infectious or inflammatory diseases. At least one year has elapsed since the diagnosis of diabetes. Non-smoker and no use of tobacco products.

Exclusion criteria

Exclusion criteria: Having type 1 diabetes Unwillingness to participate in the study. history of liver or kidney diseases, autoimmune or chronic inflammatory diseases, hematologic disorders, hypo- or hyperthyroidism, or myocardial infarction; and use of diuretics or other medications containing vitamin C. Additionally, use of antimicrobial mouthwashes, anti-inflammatory medications, or antibiotics during the past three months.

Design outcomes

Primary

MeasureTime frame
Total blood antioxidant capacity: the body's ability to counteract oxidative stress and neutralize reactive oxygen species (ROS). Timepoint: Once before the intervention and once after the intervention. Method of measurement: From each participant, two 5 mL blood samples will be collected from the antecubital vein (in tubes containing a gel separator without anticoagulant) at two time points: before the start of the intervention and at the end of the fourth week, following 8 to 12 hours of fasting. The samples will be immediately transferred to the laboratory, centrifuged, and analyzed for biochemical parameters and total antioxidant capacity (TAC) using spectrophotometry and specific kits (FRAP kit, Kavosh Arian Azma Company). A commercial kit will be used for the measurement of TAC.

Secondary

MeasureTime frame
Periodontal indices: 1. Gingival Index (GI): The Gingival Index is defined to assess gingival status and records qualitative changes in the gingiva. 2. Bleeding on Probing (BOP): BOP refers to bleeding that occurs during probing. Timepoint: Once before the intervention and once after the intervention. Method of measurement: Oral examinations will be performed by an experienced and trained dentist using a standard WHO probe under dental chair lighting. Bleeding on probing (BOP) will be assessed by recording the presence or absence of bleeding within 15 seconds after probing the interproximal area at four sites per tooth. The Gingival Index (GI) will be scored from 0 to 3 based on Löe and Silness criteria (0: no inflammation, 3: severe inflammation with bleeding). All periodontal examinations will be repeated at baseline and at the end of the fourth week.

Countries

Iran (Islamic Republic of)

Contacts

Public ContactFateme Kavosi

Birjand University of Medical Sciences

kavosifateme160@gmail.com+98 56 3238 1700

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 7, 2026