Theory: Excess Niacin (B3)

Herzenity

I was diagnosed anemic in August and it was a little worse in November despite taking an iron tablet almost every other day and increasing the amount of iron from food.
My research about causes of anemia led me to the most likely culprit: diarrhea. I had been experiencing it far more often than ever before in my life! Why?
Cronometer helped me find the answer to that. I started using the app in November and noticed that Niacin (B3) was in the red - I was getting way more than the daily upper limit (UL) due to a B Complex capsule I was taking. I learned that my regular diet gives me enough Niacin, I did not need that in the supplement.
I looked up Niacin overdose symptoms and among them was diarrhea.
As an experiment, I stopped taking the B Complex supplement and guess what? The diarrhea vanished.
This is just one person, one experiment, so take this with a grain of salt.
Next, what to do about the B vitamins that are not adequately provided in my typical diet? I purchased individual B vitamins in liquid form so that I could manage the dosage based on my needs. I find most days I need 1 of B1, B5, B6 and B12. Occasionally I need a drop of B2 and B3, depending on what I've eaten that day.
I have not had diarrhea since I stopped taking the B Complex capsule. I believe excess Niacin was the cause, and that that in turn caused anemia.
My next CBC test will show me if I have done every dietary thing necessary to resolve anemia.