Topic: Chinese garlic

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I bought my usual wreath of garlic at Brick Lane, under three quid for about 10 large bulbs. A colleague at work commented that it was imported from China and added that there are serious health concerns regarding Chinese garlic. He mentioned some sort of bleaching and fumigation with toxic substances. Anyone else heard anything similar?
I noticed that the tiny garlic bulbs in my local supermarkets are also from China.