# Redox Dual Action

Curcumin shows context-dependent redox behaviour. This helps explain why it can protect normal cells in some settings while increasing oxidative stress in tumour cells in others.

### In normal cells or lower-stress contexts

Curcumin can act as an antioxidant.

* Activates Nrf2-linked antioxidant pathways
* Supports endogenous antioxidant enzymes such as SOD and GSH-related systems
* Helps protect healthy tissue from oxidative injury

### In metabolically stressed tumour cells

Curcumin can act as a pro-oxidant.

* Increases reactive oxygen species
* Promotes oxidative damage and apoptosis
* Exploits the higher baseline oxidative stress already present in many tumours

### Why this matters

Cancer cells often live close to their redox limit. A compound that increases oxidative stress further can push them into cell death while still being relatively well tolerated by healthy tissue.

**ROS dependence:** Context-dependent dual action

See the references on [Anticancer Mechanisms](/myhealingcommunity-docs/natural-medicines/curcumin-in-oncology/anticancer-mechanisms.md).

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