Greetings and welcome. I'm sorry to hear you're so exhausted and that metallic taste must be quite annoying. While there's lots of potential causes, would you like to see if we can get to the bottom of it? It'll require lots of questions such as:
1. I agree that it could be related. Have you seen your doctor, and if so, what did they say?
2. When was the last time you had a CBC (complete blood count) and how were the results? Anything abnormal?
3. What medications are you on?
4. You say a "daily supplement", can you explain what that is specifically?
5. How much folic acid are you taking daily? Did you have tests that came back as being deficient?
6. How much vitamin B12 are you taking? Oral or injection? How often? And when was your last blood test to check B12 and what was the specific level?
7. Have you had any intestinal resections?
8. How much water do you drink a day?
9. Any other symptoms?
Let's start there
If this is too much, don't worry about it
Regardless, I'm really glad you joined and hope you feel better soon!