Basic Might Stim

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

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

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