* For Longer Life * Silymarin-Silibinin-Isosilybin B * Supports a Healthy Liver and Prostate * Dietary Supplement The botanical extract in Optimized Milk Thistle is a triple standardized milk thistle extract. In addition to an optimal 80% standardization of the main active compounds, silymarin flavonolignans, Optimized milk Thistle is isosilybin B. Most premium milk thistle extracts are void of or lack consistent amounts of the most active flavonolignan isomer isosilybin B.