Ive been diagnosed with beta minor thalassemia and my doctor told me that i am only a carrier of the disease(inherited from my mother). i have no lack of iron but i often may feel a little tiredness,so can folic acid or vitamin b make me feel better?

Depends: If you are not deficient in these, taking these vitamins will not make any difference. It will not do any harm. Do not take folic acid without taking Vitamin B12. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines