Hi Angela
You are right. There is very little that is available in the way of free online courses that also offer a certificate or other indication that you have completed a course. I usually suggest that people use the free courses for their personal learning and then they can list the skills they have learned from the course and they would be able to talk about what they have learned when in an interview but it is difficult to find free courses that offer proof that you have completed them.
I did find a site that offers a few health and safety courses and some "Health Literacy" courses. They seem like they are really basic courses but you could check to see if they are anything you might be interested in here:
Online Health Literacy Training Courses and Certification I did read a review that stated that this site provides good basic info. but I did not go to any of the training myself yet to see what it is like. This site does provide certification but I'm not sure if it would be of any use to you nor do I know exactly how it works. The review site was not interested in certification at all. He only reviews free sites and feels that the value is in gaining the knowledge rather than getting a certificate.
If you get a chance to check it out, let me know what you think. I will also be going back when I get the time to find out more about that site. Hope it is helpful for you.