Which is more harmful, methanol or ethanol?

Methanol is far more harmful than ethanol. Even small amounts of methanol (as little as 10-30 mL) can be fatal, causing blindness, organ failure, and death. Ethanol, while still toxic in excessive amounts, is metabolized differently by the body and is generally safe in moderate consumption. The liver processes ethanol into less harmful substances, whereas methanol breaks down into formaldehyde and formic acid, which are extremely toxic.