The lemongrass coil has been burning in your bedroom for years. You know it helps. You have never known why.
Here is the actual mechanism.
Mosquitoes do not find you by sight. They follow two signals: the carbon dioxide you exhale and the volatile compounds your skin releases as you move and warm up. Those are the coordinates they navigate by. Remove them, and the mosquito has nowhere to go.
Lemongrass oil contains two active compounds, citronellal and geraniol. They do not kill mosquitoes. They do not repel them the way a bad smell pushes you away from something. What they do is mask the signals mosquitoes use to locate a human host. Your scent is still there. The mosquito just cannot read it. You become, in the most literal sense, invisible to its host-seeking system.
This is olfactory interference. Chemical camouflage. The mosquito's navigation fails not because it is harmed but because the information it needs has been scrambled.
Most products in this category call themselves “natural” and leave it there. The mechanism stays vague. GreenShield Bio builds plant-based mosquito repellents on formulations like this one, where lemongrass is the active ingredient doing a specific, explainable job rather than a fragrance included for comfort.
That distinction matters when you are choosing what burns near your child's pillow at night.
