While setting up alert services can open you to tracking and spam in typical library databases, PubMed is the exception! Because PubMed is a government-sponsored database, they don't use your personal information for marketing purposes. The video below explains how to save searches and set up alerts!
Cochrane Library Navigation (5:15)
MeSH Terms and PubMed (3:02)
Also consider 'following the footnotes' of articles that are on-topic. This means that you search their bibliographies for pertinent books and articles.