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90% Reduction: Scientists Discover Natural Molecule That Eradicates Plaques and Cavities
(scitechdaily.com)
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So it seems that during the digestion in stomach acid the enzyme myrosinase is released from these plants (https://www.diindolylmethane-dim.com/formation.htm) responsible for the intermediate product DIM.
This means we could have DIM present in acidic meals of these vegetables, like for example Kimchi