While the perk's name suggests that it only affects chems, it does actually affect all aid items and consumables with timed effects, such as food healing over time or increasing skills for a certain period of time.The following items are affected by this perk: In order to select the perk, the Courier needs to have a Medicine skill of 60 or higher, and at least level 14. This perk doubles the active time for chems and other items granting a temporary positive effect. “ With the Chemist perk, any chems you take last twice as long.
