No-following Internal Links can actually harm your website. Why? No-following internal links kills off some of your website?s PageRank. Let?s see this in action on a sample site (below). Let?s see how the PageRank flow normally looks on this website: Now, let?s see what happens when we no-follow an internal link: What Happened? The Yellow Page has a PageRank of 1.0. After applying the Dampening Factor of 15%, the Yellow Page passes 0.85 Pagerank to outbound links. The PageRank is divided up evenly between outbound links. In this case, Pagerank is divided by 2. Without the No-Follow, the Yellow Page passes: 0.425 PageRank to Red Page 0.425 PageRank to Green Page With the No-Follow, the Yellow Page passes: Zero PageRank to Red Page 0.425 PageRank to Green Page Wait! Shouldn?t the no-follow send all 0.85 PageRank to the Green Page? No, over three years ago, Google changed the no-follow attribute so that it doesn?t pass more PageRank to do-follow links. More about this change on Matt Cutt?s Blog. Where does the PageRank go? The no-followed link is probably treated like a ?sink page?, so the PageRank is re-distributed throughout every page on the internet. So, when you no-follow internal links, you hurt your website and help everyone else! How bad did the no-follow link hurt? By no-following an internal link, our sample site went from a total PageRank of 3.0 to a total Pagerank of 2.575. That?s almost a 15% loss of PageRank. TLDR; Don?t no-follow internal links, especially sitewide links (like Contact Us), as you can lose a lot of PageRank!