*The big 4 that have high sales volume. Don't pick a small niche product unless super proven track record.
*Pick from the Big 4:
-Skin and Coat / Allergy solution
-Hip and Joint
Important lesson - Do not sell bundles that have 3 different problems the product solves.
Instead pick 1 problem you are the best at solving and sell more of the same product.
Here's an example of selling more.
15 Tips To Increase Ad Creative Performance.
Those are my favorites. Which one did you like best?