Two quick questions about alchemists.
1. Is there a DC needed to craft mutagens/bombs/extracts or is it just an automatic thing alchemists can do?
2. What is the purpose of the DC listed in the extract secion? I think it's ST against alchemists alchemists extract (10+extract level+int modifier)
1. yes, they just do
2. it's the saving throw if applicable, they are like spells.
Some spells/extracts have a saving throw, even if they'd normally would not want a saving throw.
An example would be an alchemist with the Infusion discovery (which allows him to give his extracts to others) giving an Infusion of Cure Light Wounds to a creature hurt by positive energy. The creature drinking it (don't know why he would drink it, but ignore that!) would still get the saving throw.