An episode dedicated to the Vitamin D controversy (some doctors say supplementation is totally useless, other doctors say almost everyone is deficient and needs supplementation), video on Dr Mehmet Oz's website :
https://www.doctoroz.com/video-series/vitamin-d-checklist?video_id=3939016272001
https://www.doctoroz.com/episode/could-matcha-green-tea-be-used-treat-cancer?video_id=5847582421001
https://www.doctoroz.com/video-series/vitamin-d-checklist?video_id=3939016272001
https://www.doctoroz.com/episode/could-matcha-green-tea-be-used-treat-cancer?video_id=5847582421001