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I've watched folk juicing in tv and they always say to peel citrus but leave the pith which contains lots of good stuff.I've just checked my Jason Vale book and he says the same .I think citrus peel may be bitter.To be honest oranges are one thing I don't particularly like juiced I find them very acidic and much prefer apples and pineapple is lovely if a little extravagant 'though you can juice the hard woody core.