They will do specific tests such as liver function on request at any general practice clinic or hospital. Ask for a doctor whose English is very good and they should be able to set you up. I can’t comment on specific vitamins and minerals other than iron, which is a common test for anemia, easily requested here.
If you post your neighborhood you might get feedback on what clinic or doctors are recommended for this. Waiting times at clinics are generally better than at hospitals.
Thanks for the reply!
Close to Gongguan would be perfect but anywhere in Taipei would be fine, really.
As long as it’s not overpriced but they still do nutritional testing.