The "headache potion" is what the label states it to be. It can actually either be used to cure headaches OR cause them--though, it seems that whatever actual effect is subjective based on the individual's own immune system. So, really, it's a flip of a coin and up to you what you'll want to experience.

The green potion seems to be a potion of rejuvenation--one sip, and you'll have energy for days!

...So, basically, it's a Monster energy drink.