While summer is technically over, there’s still plenty of time here in Virginia to soak in some sunshine. The changing season has Dr. Franssen thinking about Vitamin D — the Sunshine Vitamin! — and what it does to our immune system. BIOLOGYcalciumCoronavirusCOVID-19COVID19hormoneimmune systemIMMUNITYneuroscientistsciencescience museumscientistSunsunnySunshinesunshine vitaminthinkingthinking about thinkingvideoVITAMINvitamin CoronavirusVitamin DVITAMINSvlogYouTubeRelated Posts Cicada COVID Variant Spreading in U.S. | What Doctors Want You to Know Now April 12, 2026 New COVID Variant Affecting Kids April 7, 2026 What to know about ‘Cicada,’ the new COVID-19 variant #shorts April 6, 2026 New ‘Cicada’ COVID variant detected as experts urge caution April 4, 2026 New COVID variant spreading April 2, 2026 Long COVID: Persistent Virus or Immune Response? #shorts April 2, 2026