Medical Kits are very important in Dead frontier because it exist so that you would survive in the game. Medical kits can be looted in the city. The further you go the better medical kits you could find. Same with the higher the level the you are the much stronger medical kits you had to use.

Health Indicators:
Healthy 100%-75%
Injured 74%-50%
Serious 49%-25%
Critical 24%-1%
Death 0%