The Study
Alterations in CD4+ T Cell Cytokines Profile in Female Patients with Hashimoto's Thyroiditis Following Vitamin D Supplementation: A Double-blind, Randomized Clinical Trial.
This study gave some women with Hashimoto's vitamin D pills and others fake pills, then checked their immune system to see if it changed. It found some changes in immune chemicals, but it didn't check if the women felt better or got healthier. So we know vitamin D might affect their immune system, but we don't know if it helps their disease.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Women with Hashimoto's took a big weekly vitamin D pill for three months to see if it could quiet down their immune system's attack on the thyroid.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 552 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This suggests vitamin D may help reduce harmful inflammation in Hashimoto's by targeting specific immune pathways, even if other markers didn't budge.
- 2Vitamin D levels went up, IL-17 (an inflammatory signal) went down, and GATA3 (a regulator that shifts immunity) went up — but IL-4 didn't change.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Endocrine, metabolic & immune disorders drug targets
Year
2024
Authors
Reza Chahardoli, Behruz Robat-Jazi, F. Azizi, A. Amouzegar, D. Khalili, Azita Zadeh-Vakili, Fatemeh Mansouri, A. Saboor-Yaraghi
Related Content
Claims (6)
Low levels of vitamin D are associated with reduced immune regulation and disrupted metabolic function in humans.
In women with Hashimoto's thyroiditis, taking 50,000 IU of vitamin D3 weekly for three months raises blood levels of vitamin D and calcium but does not change the expression levels of five specific immune system proteins.
In women with Hashimoto's thyroiditis, taking vitamin D supplements increases the activity of the GATA3 transcription factor in CD4+ T cells compared to taking a placebo, without changing IL-4 gene expression.
In women with Hashimoto's thyroiditis, taking 50,000 IU of vitamin D weekly for three months does not change levels of interferon-gamma or IL-4 in the blood, and does not alter the expression of T-bet, RORγt, or FOXP3 proteins, but does affect IL-17 and GATA3.
In women with Hashimoto's thyroiditis, taking 50,000 IU of vitamin D weekly for three months is associated with lower levels of interleukin-17 in the blood and reduced activity of the gene that produces it.
In women with Hashimoto's thyroiditis, taking 50,000 IU of vitamin D weekly for three months increases TGFβ gene expression, but this increase is not statistically different from what occurs with a placebo.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.