Organ Improver 
The red-skull Organ Improver is an alchemy result with four red runes and one green. In the full game it turns any skin, bones, skull, heart, brain or guts into the version of that organ with the most red skulls, 3 of them, at the Formulation Bench. Red skulls are what a zombie’s talent slots come from (see Zombies).
The demo cannot build the Formulation Bench, so there it only gives what any mix gives: 4 red and 1 green tech points per flask and progress toward the Alchemist inspiration. At the Laboratory I the cheapest pair is a Stone and a Copper Nugget; Flax with Melted Fat also works.
How to obtain
Mix
Runes 41 ·Crafted at Laboratory I
| Ingredient |
|---|
 Copper Nugget +  Red Mushroom |
Copper Nugget +  Stone |
 Melted Fat +  Tooth |
197 ingredient combinations reach these runes — see how mixing works →
Other sources, not in the demo (3)
Craft
| Workbench | Ingredients | Duration | Tech points |
|---|---|---|---|
| — |  Alcohol ×1  Comet's Tail ×1 | 6 | 12 |
Traders
| Name | Tier | Stock |
|---|---|---|
| Alchemist · town building — build it first | All tiers | 10 |
Used for
Study
| Study requires: | Tech points | Duration |
|---|---|---|
| Science ×15 | 1050 | 6 ( Researcher −2 ) |
Each item is studied once, on the Study Table. Studying does not use the item up. With the Scientist perk, a 30% chance of a Story.
Other uses, not in the demo (6)
Ingredient for
| Workbench | Ingredients | Outputs | Mastery | Duration | Tech points |
|---|---|---|---|---|---|
| Formulation Bench |  Organ Improver ×1 |  Bones ×1 |  5 | 6 | 12 |
| Formulation Bench | Organ Improver ×1 |  Brain ×1 | 7 | 8 | 13 |
| Formulation Bench | Organ Improver ×1 |  Guts ×1 | 7 | 8 | 13 |
| Formulation Bench | Organ Improver ×1 |  Heart ×1 | 7 | 8 | 13 |
| Formulation Bench | Organ Improver ×1 |  Skin ×1 | 5 | 6 | 12 |
| Formulation Bench | Organ Improver ×1 |  Skull ×1 | 5 | 6 | 12 |
Notes
- The other Organ Improver (white skull) does the same for white skulls.
- The town Alchemist sells it from its second tier in the full game.
- Studying it costs 15 Science and gives 10 red and 50 blue.