Three years ago, my endocrinologist ran blood work on me during the winter. I had what was considered “serious” vitamin d3 deficiency, (I was a six). Prescribed an over the counter supplement and it made all the difference in the world. I had depression, joint and muscle pain, chronic fatigue and it went away. I only have to take meds from October thru March, but during the late winter months I am on my deck getting real sunshine daily. For anyone struggling in the winter please get blood work done for D3 deficiency.
Vitamin D3 deficiency here too about 5-6 years ago. I was the lowest the Dr. had ever seen in a patient. Prescribed me 50,000IU for a month, then 3-5,000 IU daily. Just wish I’d known 40 years ago. It has resulted in the most dramatic improvement in my health/mood ever. I’ve had skin cancer (melanoma - 6 years free now), so a lot of sun is no longer an option for me.
Tried the lights many years back, couldn’t tell much of a difference. Had one I used on my desk at work. Never did like the glare in the eyes (even indirect) when I used it. I did notice when I went skiing in the Winter several days in a row in sunny weather, there was improvement though - so I believe light is a big factor in mood.