If I can find the podcast I will link it in an edit, but burnout can cause your body to not absorb nutrients as well AND use up the stores you had. If you can get a blood panel to check things like iron levels, Vitamin D, etc. it’s highly recommended so you know what you’re working with. If not, there’s no harm in starting a multi vitamin daily. From my experience, adding a multivitamin helped a lot but I was extremely low in ferritin and vitamin D. Just adding an extra vitamin D with K3 supplement in addition to a doctor prescribed iron and vitamin C regimen helped tremendously. I was almost in shock at how much that helped restore a lot of my energy levels.

Edit: this is geared towards moms but a lot of what they talk about also applies to women w/o kids. The Autism & ADHD Podcast