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The Effects of Vitamin C Supplementation in Patients with Diabetes

The Effect of Vitamin C Supplementation on CRP in Patients with Type 2 Diabetes

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
IRCT
Registry ID
IRCT20251214068334N1
Enrollment
80
Registered
2025-12-25
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 take one tablet containing 1000 mg of vitamin C (ascorbic acid) daily for 4 consecutive weeks. The tablets will be taken orally, pre

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 according to ADA criteria (HbA1c = 7% or fasting glucose = 126 mg/dL). No intake of antioxidant or vitamin supplements in the past 3 months. Stability of diabetes management medication regimen in the past month. No acute infectious or inflammatory diseases in the past month. No chronic infectious or inflammatory diseases. A minimum of one-year disease history since onset. No smoking or use of tobacco products. No history of liver or kidney diseases, autoimmune or chronic inflammatory diseases, blood disorders, hypothyroidism or hyperthyroidism, myocardial infarction, or intake of diuretics and other drugs containing vitamin C; no use of antimicrobial mouthwashes, anti-inflammatory drugs, or antibiotics in the past 3 months. Provision of informed consent to participate in the study.

Exclusion criteria

Exclusion criteria:

Design outcomes

Primary

MeasureTime frame
Changes in serum levels of the inflammatory marker CRP. Timepoint: Once before the intervention and once after the intervention. Method of measurement: From the intervention group, two 5-mL blood samples will be collected, and from the control group, only one 5-mL blood sample will be taken from the antecubital vein into tubes containing a separation gel and without anticoagulant, after 8 to 12 hours of fasting (once at the beginning of the study and once at the end of the fourth week). The samples will be immediately transferred to the laboratory, centrifuged, and serum separated. They will then be stored at -20°C until analysis. Serum CRP levels will be measured using the ELISA method with commercially available validated kits, following the manufacturer’s instructions.

Secondary

MeasureTime frame
Metabolic indices: including fasting plasma glucose (FPG) and glycated hemoglobin (HbA1c). Timepoint: Once before the intervention and once after the intervention. Method of measurement: Fasting plasma glucose (FPG) and glycated hemoglobin (HbA1c) will be measured using commercially available validated kits, following the manufacturer’s instructions.

Countries

Iran (Islamic Republic of)

Contacts

Public ContactAmin Yadegari

Birjand University of Medical Sciences

aminyade80@gmail.com+98 56 3238 1700

Outcome results

None listed

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