What would be the cons of concern here?

3-6iu is pretty benign and side free for most users and basically 2iu is something that can be ran therapeutically basically indefinitely for 99% of people.

Do you experience any issues at 5 iu? Its all personal. Do you not like taking it or adherening or cost is a factor? Would it be better for your situation to apply these ius later at a higher amount?