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With the Chemist perk, any chems you take last twice as long.— In-game description

Chemist is a perk in Fallout 3, Fallout: New Vegas, Fallout 4, Fallout 76 and Fallout 2d20.

Fallout 3


This perk doubles the active time for chems.

List of items

The following items will work with this perk.


  • This perk synergizes well with the Chem Resistant perk, the latter providing a 50% resistance against addiction.
  • Chemist affects any item which also influences the Chems Taken statistic.
  • Though it specifically states that chems will last twice as long, it affects anything you can get addicted to, including alcohol.

Fallout: New Vegas

List of items



  • Icon pc.png Descriptions of items which include the item's duration are not updated to reflect the extended duration when the Chemist perk is taken. Examples of such items are RadAway, stimpaks and purified water.[verified]

Fallout 4

Any chems you take last 50% longer. Far out.— Rank 1 description

In addition to the Chemist perk affecting the duration of chems, ranks in Chemist are needed to unlock some recipes at the chemistry station usable in settlements.


Rank Requirements Description Base ID
1 INT 7 Any chems you take last 50% longer. Far out. 000E36FF
2 INT 7, LVL 16 Any chems you take now last twice as long. 000E3700
3 INT 5*, LVL 32 Any chems you take now last an additional 150% longer. 000E3701
4 INT 5*, LVL 45 Any chems you take now last an additional 200% longer. 001D2458

* 3rd and 4th ranks require 5 Intelligence as opposed to 7 due to a bug.


  • Because each effect is evaluated separately, it is possible for only some effects from a chem to be boosted.
  • Your Pip-Boy will show the enhanced duration of chems, though when viewing items in e.g. the crafting interface you will still see the default chem duration.
  • Works well with the BioCommMesh mod for chest armor pieces. A single use of jet will last 30 seconds with rank 4 of Chemist, and for 45 seconds with rank 4 of Chemist and the BioCommMesh mod.
  • In the Survival mode, Chemist rank 1 is required to manufacture many items that previously required no rank in the skill, such as a stimpak.
  • When viewing the perk the "potion created" sound effect from Skyrim, another Bethesda RPG, can be heard.
  • Chemist lengthens the duration of the heal over time of many different items, including RadAway, without modifying the healing per second, which results in a higher amount healed.
  • The bonus duration also applies to most negative effects from a chem.
  • As with Fallout: New Vegas, this perk also increases the HP effect of many edible aid items including plants, raw meat and pre-War packaged foods.

Fallout 76

Chemist only possesses a single rank, making it the most perk efficient crafting skill in Fallout 76. It no longer extends duration, that perk is instead called Chem Fiend.


Rank Description Base ID
1 You get double the quantity when you craft chems! 000E36FF
2 Cut content You get triple the quantity when you craft chems! 000E3700


Doubles the yield when crafting chems. For items which are typically crafted in quantities of 2, crafting with Chemist equipped will yield 4. Chemist affects the following:

Antibiotics Berry mentats Blood pack
Bufftats Disease cure Formula P
Fury Glowing blood pack Grape mentats
Healing salve Insect repellent Mentats
Orange mentats Overdrive Psycho
Psychobuff Rad-X: diluted Radaway
Radaway: diluted RadShield Skeeto Spit
Stimpak Stimpak diffuser Stimpak: diluted
Stimpak: super

Fallout 2d20

Chems created last twice as long as normal. In addition, unlock chems recipes that have this perk as a requirement.