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here in the UK Holland and Barrett is a likely source, of flakes as well as pills.

hello Emma @Emma140210 :frow welcome to BYC This has a list of topics about ducks that you might find useful, including some on nutrition and on specific vitamins. https://www.backyardchickens.com/threads/ducks-sticky-topics-index.256233/ I know nothing about ducks so can't help I'm afraid.