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Effect of Vitamin D supplementation on pain intensity in medical students with primary dysmenorrhea in Khonkean University : Randomized control trial

Effect of Vitamin D supplementation on pain intensity in medical students with primary dysmenorrhea in Khonkean University : Randomized control trial

Status
Active, not recruiting
Phases
Phase 2Phase 3
Study type
Interventional
Source
TCTR
Registry ID
TCTR20251228003
Enrollment
78
Registered
2025-12-28
Start date
2026-01-01
Completion date
Unknown
Last updated
2026-08-03

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

Conditions

primary dysmenorrhea with vitamin D deficiency primary dysmenorrhea, vitamin D deficiency, VAS score improvement, medical student

Interventions

Participants received vitamin D2 at a dose of 20,000 IU, administered as 3 capsules per week for 8 weeks, resulting in a total of 24 capsules. The investigational product is vitamin D2 (calciferol) at
Experimental Drug,Active Comparator Drug
Treatment arm,Supplement arm

Sponsors

Than Tiathawonchai
Lead Sponsor

Eligibility

Sex/Gender
Female
Age
18 Years to 25 Years

Inclusion criteria

Inclusion criteria: 1.Regular menstruation interval 21-35 days and duration 2-6 days 2.History of dysmenorrhea at least 4 consecutive menstrual cycles within the past 6 cycles 3.Dysmenorrhea meeting the diagnostic criteria for primary dysmenorrhea 4.VAS before receive intervention equal or more than 4 (moderate to severe dysmenorrhea) 5.Presence of vitamin D deficiency (serum 25(OH)D level less than 30 ng/mL)

Exclusion criteria

Exclusion criteria: 1.BMI more than 30 kg/m2 2.Presence of underlying diseases associated with secondary dysmenorrhea such as endometriosis, Leiomyoma, Adenomyosis or other comorbidities including thyroid or parathyroid disease, hypercalcemia, hyperphosphatemia, heart disease, liver disease and kidney disease 3.History of cigarette smoking or alcohol consumption 4.History of previous pregnancy 5.Use of calcium supplements, vitamin D supplements, or other products affecting vitamin D levels within 6 months prior to study enrollment 6.Use of oral contraceptives, intrauterine devices, or other medications containing estrogen or progesterone within 3-6 months prior to study enrollment 7.History of allergy to vitamin D or any vitamin D-containing products

Design outcomes

Primary

MeasureTime frame
Dysmenorrhea severity at 2 and 4 mo Follow up Visual analog score, difference of VAS score

Secondary

MeasureTime frame
Improvement rate at 2 and 4 mo Follow up percentage of difference of VAS score before intervention and after intervention,NSIADs Use at 2 and 4 mo Follow up percentage,Adverse event at 2 mo Follow up percentage,Compliance at 2 mo Follow up percentage,vitamin D level at 2 mo Follow up ng/dL

Countries

Thailand

Contacts

Public ContactThan Tiathawonchai

Faculty of Medicine, Khonkean University

thanti@kku.ac.th043363030

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 10, 2026