Stem Cell

Effect

• (Removed in Repentance) Heals for half a Red Heart upon traveling to the next floor.
• (Added in Repentance) Heals 50% of Isaac's empty Red Hearts and Bone Hearts (rounded down), but at minimum a half heart, upon traveling to the next floor.

Synergies

• (Glowing Hour Glass) Glowing Hour Glass: Returning to a previous floor will keep the health gained from Stem Cell, as well as granting another half-red heart after going down to the next floor again.

• (Added in Repentance) (Tainted Magdalene) Tainted Magdalene: Heals a lot of health back, usually resulting in full red health.

Interactions

• (Added in Repentance)(Blood Oath) Blood Oath: The healing will occur before any health is drained.
• (Added in Repentance) (Tainted Bethany) Tainted Bethany: Adds 1 to her "blood charges" resource.