Lets talk about extracts.
Example horny goat weed. Icariin found in it is the key of horny goat weed. How to extract it .
Two methods.
1. Solvent extraction.
Not at all expensive. It uses ethyol alcohol to extract. In this process icariin is suspended in ethyl alcohol after the extraction. Now they seperate both by heating alcohol escapes and icariin is left BUT 1% ethyl is still these as carcinogens causing cancer. This process is bad.
2. Super critical extraction be co2 process.
Approved by FDA. Very very very expensive extraction process. It's done by gas. Gas compressed in liquid state to extract out icariin. Gas escape when it is uncompressed leaving pure extract.
THE PRODUCT IS icariin 60 by world ABS. There are other brands but no one claims icariin beyond 50. Swanson, now foods, powder from china on alibaba and many more.
I rate icariin 60 by world ABS for horny goat weed extract.