Pyrrolizidine alkaloids (PA) are natural constituents detected all over the world in more than 350 plant species and suspected to occur in more than 6,000. Plants produce them as a defence against predators. Out of more than 660 known PA and similar compounds, the 1,2-unsaturated PA in particular have a health-damaging potential. Consequently, they are undesired in foods and feeds.
from Alternative Medicine News -- ScienceDaily http://bit.ly/2wkRpOQ
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