I've suffered from SAD for years. Low carb helped some, but in the winter I'd binge. Then I found out that a high dose of D3 helped, but not enough. Then last February I got fed up with the depression & bought a light box.

I LOVE it! This has been my best winter ever! Some depression before Christmas, but I had a painful knee injury & that might have contributed. But for the most part I have been happy & productive.

Recently I read that it's helpful to use year round. I've been using it daily since I bought it.