I have hypothyroidism and weirdly I had a conversation with my chiropractor and even though I'm on meds for my thyroid he told me the test I had done isn't a very thorough test that can be done. So I went to a nurse practitioner he recommended, an obgyn. She tested everything. My levels were very low on iron, thyroid, b12, vitamin D and DHEA. I went on supplements and I couldn't believe the difference in my energy levels. I no longer needed caffeine to get going. I've been going through a weird depression with high and lows. My energy has been affected a little, I'm leaning more towards my motivation I guess. Anyway these supplements changed my life.