PRO Bi-Est+ 1 fl ozBi Est+ Professional Topical Replenishing Serum is a nanoemulsified topical serum providing 1 mg of bioidentical estriol (E3) and 0. 25 mg of bioidentical estradiol (E2) per 2 pump dose. The estriol and estradiol are derived from phytosterols, natural compounds used to synthesize bioidentical estrogens.
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