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?
Do a CBC test (Complete Blood Count) ... check your, Hemoglobin and Iron levels, you could be anemic. Talk to your doctor about it.
I was anemic three months ago (hemoglobin down to 5.7). Tired, fatigued, weak, no appetite, you name it! My doctor prescribed Ferrum Hausmann 100 mg iron tabs for a month and that set me right.
Add some pumpkin seeds and sunflower seeds to a cupful of yogurt for breakfast. Load up on protein (meat, fish, beans, lentils), fruits and vegetables.
Read up on Mitochondrial deficiencies and supplements. If you find it convincing, you might want to try this:
https://www.amazon.com/gp/product/B0D925R6YH/
Don't forget your vitamins ... B12, C, D3, E ....
Just going to say, lots of BS claims in that linked product. Not only is it very expensive per dose and you could get those ingredients separately for cheaper but "More Effective Than Creatine HMB" is crap. Creatine and HMB are different substances that do different things in the body. Creatine doesn't increase energy directly but it can improve muscular endurance, it allows the muscle to hold more water which means more glycogen and it has neuroprotective effects. HMB does nothing for energy, it's an anti-catabolic that holds off muscle atrophy. None of those ingredients replace Creatine or HMB as they don't even do what those things do. That price for 30 days worth of those pills can get me 2 pounds of Creatine that will last me the entire year.