1. What Did the Study Show
The study showed that spending just 3 days and 2 nights in nature can increase natural killer (NK) cell activity by up to 80%, boosting your body’s ability to detect and fight off viruses and cancer cells—even without prior exposure.

2. Trees Emit Healing Compounds
Natural aromatic compounds like alpha-pinene, beta-pinene, and limonene released by trees (especially pines) enhance NK cell activity and promote anti-cancer protein production in the body. The immune-boosting effects can last 7 to 30 days after your time in forest.

3. What Are Natural Killer Cells
Natural killer cells are part of your immune system and act like your body’s front-line defense. They help spot and destroy harmful cells—like viruses and cancer—before they have a chance to spread.