Daily vitamin D3 supplementation improves overall sleep quality more than weekly supplementation in vitamin D3-deficient adults
In a randomized controlled trial of 87 vitamin D3-deficient adults, daily supplementation (6000 IU/day for 8 weeks) significantly improved PSQI total score compared to weekly supplementation (60,000 IU/week) (8.46 vs 9.93, P=0.024). Daily dosing also improved sleep duration (0.93 vs 1.55, P=0.002) and daytime dysfunction (0.67 vs 1.11, P=0.007), while weekly dosing was better for reducing need for sleep medication (0.13 vs 0.37, P=0.034).
This article is automatically generated from the structured evidence profile behind the claim above. Scores reflect the quality and quantity of available research, not clinical advice.
Daily vitamin D3 supplementation improves overall sleep quality more than weekly supplementation in vitamin D3-deficient adults The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 44/100 (low).
The Claim
Daily vitamin D3 supplementation improves overall sleep quality more than weekly supplementation in vitamin D3-deficient adults
This conclusion is most relevant to: Adults with vitamin D3 deficiency (mean age 39.26 years, 71% female, n=87).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Effect of Vitamin D3 Supplementation on Sleep Quality in Deficient Adults: A Randomized Controlled Trial. (Neurology India, 2026) —
How It Works
The proposed biological pathway:
- ▸Vitamin D3 supplementation increases serum vitamin D3 levels
- ▸Vitamin D3 receptors in brain regions involved in sleep regulation are activated
- ▸Improved vitamin D3 status may modulate sleep-related neurotransmitters and circadian rhythms
- ▸Result: Improved overall sleep quality, sleep duration, and daytime dysfunction
Who Might Benefit
Evidence fit by population:
- ▸Adults with vitamin D3 deficiency (mean age 39.26 years, 71% female, n=87)
Recommended Dose
6000 IU/day (daily arm) or 60,000 IU/week (weekly arm)
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Single-center, single-blinded design may introduce bias
- ▸Subjective sleep quality measured via PSQI only, no objective measures (e.g., polysomnography)
- ▸Short duration (8 weeks) may not capture long-term effects
- ▸No placebo control group, only comparison between two dosing regimens
Frequently Asked Questions
What is the recommended dose of vitamin D3 for improving sleep quality in deficient adults?▼
The study suggests daily supplementation of 6000 IU/day for 8 weeks is more effective than weekly dosing for overall sleep quality, but individual dosing should be guided by a healthcare provider.
How does vitamin D3 affect sleep quality?▼
Vitamin D3 may influence sleep through receptors in brain regions regulating sleep, and by modulating neurotransmitters and circadian rhythms, though the exact mechanism is not fully understood.
Is daily or weekly vitamin D3 supplementation better for sleep?▼
Based on this trial, daily supplementation (6000 IU/day) improved overall PSQI score, sleep duration, and daytime dysfunction more than weekly supplementation (60,000 IU/week), though weekly dosing was better for reducing need for sleep medication.
Who was studied in this vitamin D3 sleep trial?▼
The study included 87 adults with vitamin D3 deficiency, with a mean age of 39.26 years and 71% female, from a single center in India.
References
- 1.Lalitha LP, Rangaiah P, Mehta A, Javali M, Acharya PT, Somanna SN. “Effect of Vitamin D3 Supplementation on Sleep Quality in Deficient Adults: A Randomized Controlled Trial..” Neurology India, 2026. PMID: 42619227 DOI: 10.4103/neurol-india.Neurol-India-D-26-00162