# How do mutagenic serums work?

**URL:** <https://discourse.cataclysmdda.org/t/how-do-mutagenic-serums-work/7855>\
**Category:** The Garage\
**Created:** [November 11, 2014, 11:53am UTC](https://discourse.cataclysmdda.org/t/how-do-mutagenic-serums-work/7855 "2014-11-11T11:53:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![EkarusRyndren](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/ekarusryndren/32/80_2.png) [@EkarusRyndren](https://discourse.cataclysmdda.org/u/EkarusRyndren)\
**Post date:** [November 11, 2014, 11:53am UTC](https://discourse.cataclysmdda.org/t/how-do-mutagenic-serums-work/7855/1 "2014-11-11T11:53:15Z")

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I remember awhile back it was dependant on health, but in my last few games I’ve rarely been getting more than one mutation per serum use-- which means it’s cheaper to just use regular mutagen.

Did something change?

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**Author:** ![Coolthulhu](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/coolthulhu/32/2446_2.png) [@Coolthulhu](https://discourse.cataclysmdda.org/u/Coolthulhu)\
**Post date:** [November 11, 2014, 12:25pm UTC](https://discourse.cataclysmdda.org/t/how-do-mutagenic-serums-work/7855/2 "2014-11-11T12:25:45Z")

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Most serums have 1 guaranteed mutation, 66% for another and 50% for yet another one (rolled independently). The “rare” ones and medical have higher chances, meaning it’s worth concentrating them. Untargeted has 3 guaranteed, then 75%/66%/66%.  
Targeted mutagens always have 1. Untargeted has 100%/66%/50%.

Clear win for serums.

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**Author:** ![KA101](https://avatars.discourse-cdn.com/v4/letter/k/278dde/32.png) [@KA101](https://discourse.cataclysmdda.org/u/KA101)\
**Post date:** [November 12, 2014, 4:46am UTC](https://discourse.cataclysmdda.org/t/how-do-mutagenic-serums-work/7855/3 "2014-11-12T04:46:41Z")

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That said, you take fatigue/hunger/thirst/pain hits per mutation, too. Serums should not be immediately injected if found.