Specific active phytochemical constituents (Flavone glycosides Megastigmane glycosides bitter principles saponine Caratuberside (A and B) Boucerosides (I to X) Tomentogenin Sitosterols Luteolin-4-neohesperidoside and Kaempferol-7-0-neohesperidosid) can be enhanced by breeding procedures.
For example, to prevent migraines we are told to eat foods containing vitamin B3, bitter principles and quercetin such as Brazil nuts, garlic, muesli, mushrooms, oats, onion, rice and sweetcorn.
Summer-harvested roots (June--August) produce a less uniform product with lower content of biologically active bitter principles. Late September--October harvest is preferred.
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