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If your blood test
result show underactive Thyroid function,It is due to subclinical Hypothyroidism
, that is why you do not have any symptoms at present but if this allowed to continued then clinical hypothyroidism may occur.
It is correct to retest the thyroid function to be sure it is not lab error.
Please visit a Physician or Endocrinologist
and if TSH
is high and your doctor suggest supplementation take it it will help.This is very safe and almost negligible side effects.
Niacin is B3 part of B complex vitamin it can be supplemented if suggested by Physician.
Take care of your diet and regular followup with physician.
Dr.Akhilesh Dubey M.D.