Effect of Combined Probiotics and Vitamin D on Symptoms of Allergic Rhinitis

Not Applicable

Recruiting

• Conditions: Allergic Rhinitis; Allergic Rhinitis (AR)
• Interventions: Drug: Standard Allergic Rhinitis Treatment; Dietary Supplement: Oral Vitamin D Supplement; Dietary Supplement: Oral Probiotic Supplement; Dietary Supplement: Combined Vitamin D and Probiotics Supplementation

• Registration Number: NCT07115342
• Lead Sponsor: Tanta University

Brief Summary

The goal of this clinical trial is to learn if taking probiotics, vitamin D, or both together can help lower symptoms of allergic rhinitis (AR) and improve quality of life in adults. Allergic rhinitis is a condition that causes sneezing, nasal congestion, and itchy or watery eyes.

The main questions this study aims to answer are:

• Do these supplements improve the quality of life for people with AR?

Researchers will compare four groups:

* People taking probiotics only

* People taking vitamin D only

* People taking both probiotics and vitamin D

* People receiving standard treatment only (control group)

Participants will:

* Take a probiotic capsule daily and/or a vitamin D tablet (based on blood levels) for 12 weeks

* Continue standard allergic rhinitis treatment (like antihistamines or nasal sprays)

* Visit the clinic for checkups and lab tests

* Complete surveys about their symptoms and quality of life

This study will help researchers understand if adding probiotics and/or vitamin D to standard care can help people with allergic rhinitis feel better.

Detailed Description

Allergic rhinitis (AR) is a common condition that causes nasal symptoms such as sneezing, runny nose, and congestion, often with itchy or watery eyes. It affects quality of life, sleep, work performance and increases healthcare use.

Recent research suggests that the gut microbiome and immune regulation play important roles in allergic diseases. Probiotics may help by balancing gut bacteria and reducing inflammation. Vitamin D, which supports immune function, is often low in people with allergies and may help improve symptoms.

While probiotics and vitamin D have each been studied separately in AR, their combined effect has not been well investigated.

This study aims to evaluate whether combining these supplements with standard care is more effective than using either supplement alone or standard care alone.

This is a randomized, controlled, 4-arm clinical trial. Adult participants with moderate to severe allergic rhinitis will be randomly assigned to one of four groups:

* Standard care (control group)

* Standard care + probiotics

* Standard care + vitamin D

* Standard care + probiotics + vitamin D

Supplements will be taken for 12 weeks. The study will measure symptom severity, quality of life, and changes in certain immune markers. The findings may offer new insights into effective, low-risk, and accessible options to support allergic rhinitis management.

Study Timeline

• Status Verified: 2025-07
• Study Start: 2025-08-01
• Study First Submitted: 2025-08-01
• Study First Submitted QC: 2025-08-03
• Last Update Submitted: 2025-08-03
• Study First Posted: 2025-08-11
• Last Update Posted: 2025-08-11
• Primary Completion: 2025-10-30
• Study Completion: 2025-11-30

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 200

Inclusion Criteria

Confirmed diagnosis of AR based on clinical history and specific IgE testing or will be screened for eligibility by the modified Mini Rhino-conjunctivitis Quality of Life Questionnaire (Mini RQLQ).

Persistent rhinitis symptoms for at least two consecutive years. Presence of two or more AR symptom domains, including sneezing, watery rhinorrhea, nasal itching, and nasal congestion, with symptoms persisting or accumulating for more than 1 hour daily with > 2 scores without taking medication. Symptoms may be accompanied by ocular manifestations such as eye itching, tearing, and redness Voluntarily and in writing, sign an informed consent form agreeing to participate in this study and able to complete the study as required by the trial protocol.

Vitamin D insufficiency or deficiency. Deficiency: < 20 ng/mL (< 50 nmol/L), Insufficiency: 20-29 ng/mL (50-75 nmol/L)

Exclusion Criteria

Use of systemic corticosteroids, immunosuppressive therapy, or medications affecting the gut microbiota (antimicrobials, probiotics, prebiotics, intestinal mucosal protective agents, etc.) within 4 weeks prior to screening.

Regular use of probiotics, prebiotics, or vitamin D supplements within 6 months prior to screening.

History of or concurrent use of medications or supplements that alter serum 25(OH)D levels, such as barbiturates, bisphosphonates, sulfasalazine, anticonvulsants, antiretrovirals, omega-3 supplements, or ketoconazole.

Diagnosed with pulmonary tuberculosis, allergic asthma, chronic obstructive pulmonary disease (COPD), mast cell activation syndrome, or other respiratory diseases requiring treatment.

Coexisting conditions such as nasal polyps, severe nasal septum deviation, severe gastrointestinal diseases (e.g., severe diarrhea or inflammatory bowel diseases), metabolic syndrome (e.g., obesity, dyslipidemia, hypertension, diabetes), or chronic systemic diseases or malignancies.

History of autoimmune diseases or chronic inflammatory conditions. Sinusitis, otitis media, or respiratory tract infections or upper respiratory infections within 14 days of the study start.

Known hypersensitivity or allergy to any component of the probiotics or other study interventions.

Physical signs or symptoms suggestive of renal, hepatic, or cardiovascular disease.

Pregnant or lactating women.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Control Group	Standard Allergic Rhinitis Treatment	-
Vitamin D Group	Oral Vitamin D Supplement	-
Probiotics Group	Oral Probiotic Supplement	-
Combination Group	Combined Vitamin D and Probiotics Supplementation	-

Primary Outcome Measures

Name	Time	Method
Change in Total Nasal Symptom Score (TNSS) and Quality of Life in Patients With Allergic Rhinitis	From Baseline to Week 12 (End of Intervention)	TNSS is a validated clinical scale measuring four core nasal symptoms (itching, congestion, sneezing, and runny nose), each scored from 0 (none) to 3 (severe), with a total score range of 0-12. The Rhinitis Quality of Life Questionnaire (RQLQ) will assess patient-reported quality of life related to allergic rhinitis, including daily activity limitations, nasal and eye symptoms, sleep disturbance, and emotional well-being.

Secondary Outcome Measures

Name	Time	Method
Change in Serum Immunoglobulin E (IgE) Levels	From Baseline to Week 12	Total IgE concentration will be measured using ELISA from venous blood samples at baseline and after 12 weeks to assess allergic sensitization and systemic immune response.
Change in Nasal Eosinophil Count	From Baseline to Week 12	Nasal smear cytology will be used to quantify eosinophil presence, an indicator of allergic inflammation.
Change in Serum Interleukin-13 (IL-13) and C-Reactive Protein (CRP)	From Baseline to Week 12	Serum inflammatory markers IL-13 and CRP will be measured to assess changes in systemic and allergic inflammation.

Trial Locations

Locations (1)

Tanta University Hospital, ENT Department; 🇪🇬 Tanta, Gharbia Governorate, Egypt