Basic Fortitude Stim

Basic Fortitude Stims are basic stimpacks available for purchase from most low-level stim vendors.

Use
Upon activation of a Basic Fortitude Stim, a character's Endurance ability is increased by 8 points for the next 60 minutes. Each character can only benefit from a single stimpac at any one time; if a new stimpac is activated before the duration of another has expired, the effect of the previous stimpac will be replaced by the effect of the most recently used item.

Source
Basic Fortitude Stims can be bought from low-level stimulant vendors.
 * Vendor store price
 * credits 150