Best Supplements for Reduced Vitamin D Deficiency
Ranked by research evidence. Compare 1 supplement across 4 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence4 studies
Across 4 studies on vitamin D for reducing vitamin D deficiency, 2 reported beneficial effects (moderate and large) and 2 reported neutral effects (small). The predominant effect size is mixed (small to large). A 2025 RCT in children with inflammatory bowel disease found that both 2000 IU daily and stoss protocols significantly increased 25OHD levels over 12 months. The median study duration was 273 days (approximately 9 months).
Product matchViva Naturals — Vitamin D3 with Organic Liquid Coconut Oil125 mcg · $15.16 · ★5.0 (208)
1 supplement
- LowVitamin DAcross 4 studies on vitamin D for reducing vitamin D deficiency, 2 reported beneficial effects (moderate and large) and 2 reported neutral effects (small). The predominant effect size is mixed (small to large). A 2025 RCT in children with inflammatory bowel disease found that both 2000 IU daily and stoss protocols significantly increased 25OHD levels over 12 months. The median study duration was 273 days (approximately 9 months).2 beneficial2 neutral4 studies