What is the DOI number on a study?

This will help you find the study if the old link doesn't work.

Many studies on Pubmed.gov have a DOI number. You can enter the DOI number into a search site at https://doi.org and the DOI service will redirect you to the actual study. Some studies have a full link to the DOI address like this one: https://doi.org/10.1016/j.bmcl.2019.04.045 This is a study about ivermectin treating cancer. This DOI link actually takes us to a sciencedirect.com site. The DOI service is a central repository to take you to the current site of the studies because sometimes sites just go away.

If your original link to a study doesn’t work, go to https://doi.org, and enter the DOI number. You will be sent to the current site.