The invention relates to unique compositions containing enriched and purified natural crocin and/or crocetin for prevention and/or treatment of cancers and other conditions and diseases. Compositions comprise mainly enriched or purified natural crocin or crocetin or combination of both and possible other active phytochemicals. A composition is used as functional food, drink, dietary supplement, or therapeutic dosage to a human orally or through other appropriate way (parenteral, percutaneous, rectal, mucosal, intranasal or topical administration). A method of natural crocin and crocetin enriching and purification is revealed.