Diabetic Nephropathy Type 2Phase 2/3NCT07644520
Vitamin D in Diabetic Neuropathy
A Phase 2/3 study testing Vitamin D in people with Diabetic Nephropathy Type 2, run by Tanta University.
Trial summary
Introduction Diabetic peripheral neuropathy (DPN) is among the most common chronic complications of diabetes mellitus and represents a major cause of morbidity, impaired quality of life, sleep disturbance, chronic pain, and functional disability.(Kurz et al., 2026) The pathogenesis of DPN is multifactorial and… Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Diabetic Nephropathy Type 2
- What is being tested?
- Vitamin D
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 150 participants
- Where
- No sites listed yet
- Study dates
- 1 Oct 2026to 30 Oct 2027
- Phase
- Phase 2/3
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Participants must fulfill all the following:
- 1. Age between 18 and 75 years 2. Diagnosed with type 2 diabetes mellitus according to ADA criteria 3. Clinically diagnosed diabetic peripheral neuropathy 4. Neuropathic symptoms for at least 3 months 5. Vitamin D insufficiency or deficiency:
- Serum 25(OH)D < 30 ng/mL 6. Stable antidiabetic treatment for at least 3 months Exclusion criteria
- Type 1 diabetes mellitus
- Current vitamin D supplementation within the previous 3 months
- Severe renal impairment (eGFR < 30 mL/min/1.73m²)
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- Severe hepatic impairment
- Hypercalcemia
- Malabsorption syndromes
- Pregnancy or lactation
- Peripheral neuropathy due to causes other than diabetes:
- Vitamin B12 deficiency
- Hypothyroidism
- Alcoholic neuropathy
- Chemotherapy-induced neuropathy 9. Active malignancy 10. Severe psychiatric illness
Who cannot join
None listed.
About this study
Official title: Effect of Vitamin D Supplementation on Neuropathic Pain, Sleep Quality, and Quality of Life in Patients With Diabetic Peripheral Neuropathy
Introduction Diabetic peripheral neuropathy (DPN) is among the most common chronic complications of diabetes mellitus and represents a major cause of morbidity, impaired quality of life, sleep disturbance, chronic pain, and functional disability.(Kurz et al., 2026) The pathogenesis of DPN is multifactorial and involves oxidative stress, chronic inflammation, endothelial dysfunction, mitochondrial injury, and microvascular ischemia, leading to progressive nerve damage.(Yang et al., 2025) Despite the availability of symptomatic therapies such as gabapentin, pregabalin, and duloxetine, many patients continue to experience persistent neuropathic symptoms, poor sleep quality, and impaired daily functioning. Existing pharmacological therapies are often associated with incomplete response, adverse effects, and high economic burden.(Kaye et al., 2025) Recently, vitamin D has attracted attention beyond its classical role in calcium and bone metabolism. Experimental and clinical evidence suggest that vitamin D possesses neuroprotective, anti-inflammatory, immunomodulatory, and antioxidative properties. Vitamin D receptors are widely distributed in neuronal tissues, Schwann cells, and immune cells, suggesting a potential role in nerve repair and modulation of neuropathic pain pathways.(Liu et al., 2025) Several observational studies have demonstrated a high prevalence of vitamin D deficiency among patients with diabetic neuropathy, and low serum vitamin D levels have been associated with increased neuropathic pain severity and poorer quality of life. However, available interventional studies remain limited and have produced inconsistent findings regarding the therapeutic benefit of vitamin D supplementation in DPN.(Ou et al., 2021) Therefore, this study aims to evaluate whether vitamin D supplementation can improve neuropathic pain, sleep quality, and health-related quality of life among patients with diabetic peripheral neuropathy.
- Conditions
- Diabetic Nephropathy Type 2
- Being tested
- Vitamin D
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Vitamin DDietary supplement
VITAMIN D SUPPLEMENT
| Study group | Role | What they receive |
|---|---|---|
| control | No intervention | Not described |
| test | Active comparator | Not described Receives: Dietary Supplement: Vitamin D |
What is being measured
The primary outcome is the main question the study is designed to answer.
Primary outcome Change in neuropathic pain severity Measured using Visual Analog Scale (Baseline -Week 6 -Week 12)
Measured: 3 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Jun 2026
- Study start1 Oct 2026 (estimated)
- Primary completion1 Oct 2027 (estimated)
- Study completion30 Oct 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Diabetic Nephropathy Type 2Studies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2/3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- vitamin D
- Masking
- None (open label)
- Enrolment
- 150 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Tanta University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Khadija Ahmed Mhrose Glal, Tanta University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07644520
- Sponsor's protocol ID
- Vitamin D in DNP
- Status last verified
- Sep 2026
- First submitted
- 8 Jun 2026
- Last updated
- 8 Sep 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes
Study at a glance
From the registry record, last updated by the sponsor on 8 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of Vitamin D Supplementation on Neuropathic Pain, Sleep Quality, and Quality of Life in Patients With Diabetic Peripheral Neuropathy
- ClinicalTrials.gov ID
- NCT07644520
- Acronym / sponsor ID
- Vitamin D in DNP
- Conditions
- Diabetic Nephropathy Type 2
- Phase
- Phase 2/3
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 150 participants (estimated)
- Lead sponsor
- Tanta UniversityUniversity, hospital or other
- Study start
- 1 Oct 2026 (estimated)
- Primary completion
- 1 Oct 2027 (estimated)
- Study completion
- 30 Oct 2027 (estimated)
- First posted
- 12 Jun 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Introduction Diabetic peripheral neuropathy (DPN) is among the most common chronic complications of diabetes mellitus and represents a major cause of morbidity, impaired quality of life, sleep disturbance, chronic pain, and functional disability.(Kurz et al., 2026) The pathogenesis of DPN is multifactorial and involves oxidative stress, chronic inflammation, endothelial dysfunction, mitochondrial injury, and microvascular ischemia, leading to progressive nerve damage.(Yang et al., 2025) Despite the availability of symptomatic therapies such as gabapentin, pregabalin, and duloxetine, many patients continue to experience persistent neuropathic symptoms, poor sleep quality, and impaired daily functioning. Existing pharmacological therapies are often associated with incomplete response, adverse effects, and high economic burden.(Kaye et al., 2025) Recently, vitamin D has attracted attention beyond its classical role in calcium and bone metabolism. Experimental and clinical evidence suggest that vitamin D possesses neuroprotective, anti-inflammatory, immunomodulatory, and antioxidative properties. Vitamin D receptors are widely distributed in neuronal tissues, Schwann cells, and immune cells, suggesting a potential role in nerve repair and modulation of neuropathic pain pathways.(Liu et al., 2025) Several observational studies have demonstrated a high prevalence of vitamin D deficiency among patients with diabetic neuropathy, and low serum vitamin D levels have been associated with increased neuropathic pain severity and poorer quality of life. However, available interventional studies remain limited and have produced inconsistent findings regarding the therapeutic benefit of vitamin D supplementation in DPN.(Ou et al., 2021) Therefore, this study aims to evaluate whether vitamin D supplementation can improve neuropathic pain, sleep quality, and health-related quality of life among patients with diabetic peripheral neuropathy.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
- Model description
- vitamin D
| Arm | Type | Receives |
|---|---|---|
| control | No intervention | – |
| test | Active comparator | Dietary Supplement: Vitamin D |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (15 listed)
- 1. Age between 18 and 75 years 2. Diagnosed with type 2 diabetes mellitus according to ADA criteria 3. Clinically diagnosed diabetic peripheral neuropathy 4. Neuropathic symptoms for at least 3 months 5. Vitamin D insufficiency or deficiency:
- Serum 25(OH)D < 30 ng/mL 6. Stable antidiabetic treatment for at least 3 months Exclusion criteria
- Vitamin B12 deficiency
- Hypothyroidism
- Alcoholic neuropathy
Key exclusion criteria (0 listed)
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Vitamin DVITAMIN D SUPPLEMENT | Dietary supplement | test |
Primary outcome
Primary outcome Change in neuropathic pain severity Measured using Visual Analog Scale (Baseline -Week 6 -Week 12)
Time frame: 3 months
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Sep 2026.
- Individual participant dataSharing planned: Yes
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
The record lists no contact. Use the official record to reach the sponsor.
Questions about this trial
What is this clinical trial studying?
A Phase 2/3 study testing Vitamin D in people with Diabetic Nephropathy Type 2, run by Tanta University.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 15 inclusion and 0 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 8 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this combined phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Primary outcome Change in neuropathic pain severity Measured using Visual Analog Scale (Baseline -Week 6 -Week 12) (time frame: 3 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Sep 2026.