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?
C, B12/complex, D3 with plenty of water and sunlight, zinc, and quercetin have done wonders for my energy levels and immune system.
The RDA of Vit C is considered to be way too low, especially by the Linus Pauling Institute who recommends around 450mg/day which is at least 4 times what people generally get. You may think you get a lot of vitamin C until you read the label on orange juice and see how little is actually in a glass of it. Just be careful taking more than 500mg at a time as it can easily cause diarrhea in unaccustomed people.
In this same vein, anything over 50mg of zinc can give some wicked headaches