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It depends on whats currently out there and how the page is being redirected. If the page is being 301 redirected from http to https then you may lose link juice if everyone is linking to the http version. For most webmasters, you only need a handful of pages to be https so I would consider that as well if that applies to you (it may not). As Alan mentions, you may run into duplication issues if the web page can be accessed by http and https.Check out this article by Search Engine Journal. http://www.searchenginejournal.com/seo-for-http-and-https/15055/