Short answer is no. The videos should be watched in order, as it is imperative to understand the biological process of osteoarthritis before making any decisions on treatment/management.
The reason I created this mini course is because people often go straight for supplements, or steroid injections, before considering other ways to help their horse.
I don't want you to spend money unnecessarily on products, when your horse could feel much better by spending a little more effort on their day to day management.
The supplements video (like all topics) is an overview of the actions and evidence for each one but will not tell you which to buy, so you can make your own decision.