Vitamin D linked to health benefits

The video discusses various health benefits and risks associated with vitamin D. It highlights research from the University of Copenhagen showing that vitamin D can improve sperm motility. Additionally, it explores studies linking vitamin D to neurological health, specifically multiple sclerosis, and discusses the risks of vitamin D deficiency, including adolescent obesity and increased pneumonia deaths.

What effect does vitamin D have on sperm motility according to the research?

What link does the article suggest between vitamin D deficiency and pneumonia?