This video is about Vitamin D:
And below is the link to Dr. Campbell’s channel so you can browse the titles and choose which one(s) you wish to watch. He is both technical and user-friendly and he has a large audience. It appears he is making a video every day during this time of crisis. When he says “vit’.uh.min” he means what we mean when we say “vite’.uh.min”… he’s English.