Canada here. "Central Canada" aka reasonably far up. 2000 IU a day, 3-5 days a week. Not strict about it, just whenever I remember. Big difference in terms

Canada here. "Central Canada" aka reasonably far up. 2000 IU a day, 3-5 days a week. Not strict about it, just whenever I remember. Big difference in terms of energy, depression, sleep quality, etc. I've messed around with higher levels but they usually give me wicked headaches.