Living in Canada, the shorter colder days and lack of sunshine mean that you are likely to be Vitamin D deficient this time of year, so keeping track of your intake is vital and right now, Vitamin D is proving more important than ever. Deficiencies have been linked to poor sleep, pain, muscle weakness and depression. Additionally, Vitamin D is linked to preventing skeletal issues such as rickets, improved immune function and cardiovascular health and while evidence remains spotty, there have also been preliminary studies linking it to improved outcomes related to acute respiratory issues, including COVID-19.