Age:42, on thyroid replacement therapy, dub, small fibroids, high ldl, what multivitamins I should take? Natural vs synthetic? Calcium supplements?

Multivitamin+mineral. There may not be proof that multivitamins change a person's thyroid status, dub symptoms, fibroids, LDL levels, etc... American adults can take a multivitamin + minerals (one might trust name brands more). Natural or synthetic, or a mixture, should have the same effects. One can bring all his vitamins to the primary care doctor to review. Iron may help, if heavy dub. Vitamin d is needed, if low.