This potion enables the consumer to be refreshed and full of vitality despite exertion, lack of sleep, and going without food and drink for as long as seven days. 

If the potion is consumed after one or more days of such exertion or deprivation, it will nullify the adverse effects and still bestow vitality for the remaining number of days up to seven. 

In addition, the potion is proof against poisons and diseases for the indicated period — and while the potion is in effect, the beneficiary will recover lost hit points at the rate of 1 every 4 hours.