The solubility and bioequivalence of silymarin preparations

Seven silymarin products (pharmacies only), two of them with two batches each, were analysed for their ingredients, in particular silibinin (CAS 22888-70-6) and tested in vitro for their liberation of active agents. Founded on the results of these tests there products were checked for bioequivalence. Therefore, a typical phase I 3 fold crossover study was performed showing one product (Legalon®) to be qualified by an approx. 2 fold higher silibinin availability compared to the two other preparations