Why Harry wasn't given the Polyjuice potion in Deathy Hallows Part 1?

I was just rewatching The Deathly Hallows part 1 and I saw the scene where Mad Eye gives Polyjuice Potion to everyone to looks like Harry when they escort Harry. I just thought it would be easier to give the potion to Harry to make him look like someone and take him with them safely. What's your take on this?