Figure 2

![Figure 2: FIGURE 1—A schematic of the prospective cohort study (study 1) that investigated the association between vitamin D status (serum 25(OH)D), URTI and days lost from training, and the randomized controlled trial (study 2) that investigated the effects of vit](https://pdfs.citedhealth.com/figures/33481482/64.png)

> Source: Sophie E Harrison et al. "Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respi." *Medicine and science in sports and exercise*, 2021. PMID: [33481482](https://pubmed.ncbi.nlm.nih.gov/33481482/)

<figure>
  <img src="https://pdfs.citedhealth.com/figures/33481482/64.png" alt="FIGURE 1—A schematic of the prospective cohort study (study 1) that investigated the association between vitamin D status (serum 25(OH)D), URTI and days lost from training, and the randomized controlled trial (study 2) that investigated the effects of vit" />
  <figcaption>Figure 2. FIGURE 1—A schematic of the prospective cohort study (study 1) that investigated the association between vitamin D status (serum 25(OH)D), URTI and days lost from training, and the randomized controlled trial (study 2) that investigated the effects of vit<br>  Source: Sophie E Harrison et al. "Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respi." <em>Medicine and science in sports and exercise</em>, 2021. PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/33481482/">33481482</a></figcaption>
</figure>