Fallout Wiki
Fallout Wiki
For the trait, see Fast Metabolism (trait).

With the Fast Metabolism perk, you gain a 20% Health bonus when using Stimpaks.

Fast Metabolism is a perk in Fallout 3, Fallout: New Vegas and Fallout 2d20.


Fallout 3 and Fallout: New Vegas

With the Fast Metabolism perk, the player character gains a 20% bonus when using stimpaks. In Hardcore mode, the multiplier increases the amount of healing per second making stimpaks an even better in-combat healing option. Players outside of Hardcore mode may be better served by simply applying multiple stimpaks from their Pip-Boy rather than investing in the perk.

This perk also affects (adapted) alien biogel, which is added to Fallout 3 with the Mothership Zeta add-on.

Fallout 2d20

When regaining one or more HP from any source other than rest, increase the total HP regained by +1 per rank in this perk.

Each time this perk is taken, the level requirement increases by 3.


Synergizes extremely well with Chemist, Better Healing, Cardiac Arrest Old World Blues (add-on) and a high Medicine skill.