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Change in serum 25-hydroxy vitamin D after 15 minutes of noontime sunlight exposure twice a week in Thai healthy volunteers: A randomized controlled trial.

Change in serum 25-hydroxy vitamin D after 15 minutes of noontime sunlight exposure twice a week in Thai healthy volunteers: A randomized controlled trial.

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
TCTR
Registry ID
TCTR20190224002
Enrollment
Unknown
Registered
2019-02-24
Start date
2015-03-01
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

Serum 25&#45

Interventions

Broadband UVB irradiation 4 standard erythema dose (SED) each session&#44
total 64 SEDs
Experimental Procedure/Surgery
Broadband UVB irradiation

Sponsors

National Science and Technology Development Agency
Lead Sponsor
Faculty of medicine Ramathibodi hospital&#44
Collaborator
Mahidol university
Collaborator

Eligibility

Sex/Gender
All
Age
18 Years to 70 Years

Inclusion criteria

Inclusion criteria: Age 18-70 years Healthy

Exclusion criteria

Exclusion criteria: Pregnancy or breast feeding women Skin disease, non-melanoma skin cancer, photosensitivity diseases Renal, liver, thyroid or bone diseases Vitamin D supplement within 3 months Sunbath within 3 months

Design outcomes

Primary

MeasureTime frame
25-hydroxy vitaminD3 level 8 weeks Serum 25-hydroxy vitaminD3 level measure by LCMS-MS technique—

Secondary

MeasureTime frame
Skin lightness, melanin and erythema index, side effect 8 weeks Coloremeter—

Countries

Thailand

Contacts

Public ContactPloychompoo Srisuwanwattana

Division of Dermatology, Faculty of Medicine Ramathibodi Hospital, Mahidol University

ploychompoos@hotmail.com+66864600141

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026