Why am I asking this question on a Q board? Because Q people are probably a lot smarter than the other internet forums I frequent. Besides that, I don't think Q would mind anyway.
The vitamins subject is a deep rabbit hole. I don't have time to go down that rabbit hole, so I figure starting a thread and asking the Q community would be way quicker.
I've been feeling tired all the time for several weeks now. I'll throw in fatigued and lethargic too. I've got my mind made up that it's a vitamin deficiency. I think all of us could benefit from this knowledge about vitamins. I've heard that taking vitamin D3 can boost energy levels. What other vitamins are important?
This is a more expensive but genuine longterm solution, worked for me and the wife:
Forget "vitamins" per se and find something that is full-spectrum nutrition superfoods, like Juice+ or Brickhouse nutrition or something... there might be something you are lacking in your regular diet that you are unaware of, but is causing sluggishness.
The reason being that when you are eating actual food, your body does a better job of processing and absorbing the various vitamins and nutrients you want.
When you look into it, you'll find a lot of supplements and vitamins we take don't even get processed when we take them in tablet form; we just crap it right back out.
Also, look into minimizing electro-magnetic pollution. Turning off the wifi at night, putting the phone further away, grounding mats - you might be shocked to find your sleep is more restful even though you are getting the same amount.