Figure 3

![Figure 3: FIGURE 2—Seasonal variation in serum 25(OH)D (A), vitamin D sufficiency prevalence (serum 25(OH)D ≥50 nmol·L−1; B), and the URTI prevalence when serum 25(OH)D ≥50 nmol·L 1 or <50 nmol·L 1 (C) in 1644 men and women during 12 wk of military training. aLo](https://pdfs.citedhealth.com/figures/33481482/89.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/)

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  <img src="https://pdfs.citedhealth.com/figures/33481482/89.png" alt="FIGURE 2—Seasonal variation in serum 25(OH)D (A), vitamin D sufficiency prevalence (serum 25(OH)D ≥50 nmol·L−1; B), and the URTI prevalence when serum 25(OH)D ≥50 nmol·L 1 or &lt;50 nmol·L 1 (C) in 1644 men and women during 12 wk of military training. aLo" />
  <figcaption>Figure 3. FIGURE 2—Seasonal variation in serum 25(OH)D (A), vitamin D sufficiency prevalence (serum 25(OH)D ≥50 nmol·L−1; B), and the URTI prevalence when serum 25(OH)D ≥50 nmol·L 1 or &lt;50 nmol·L 1 (C) in 1644 men and women during 12 wk of military training. aLo<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>