There is no single "laughter hormone." Instead, laughter is a complex physiological response that triggers the release of several neurotransmitters and hormones that work together to create feelings of pleasure and social bonding.

The primary chemical players involved in laughter include:

• Endorphins: These are the body’s natural "feel-good" chemicals. Laughter triggers the release of endorphins in the brain, which act as natural painkillers and create a sense of euphoria and well-being.
• Dopamine: Often associated with the brain's reward system, dopamine is released during laughter, reinforcing the behavior and making the experience pleasurable, which encourages us to laugh again.
• Serotonin: Laughter can help boost serotonin levels, which plays a key role in regulating mood and reducing feelings of anxiety or depression.
• Oxytocin: Known as the "bonding hormone," oxytocin is often released during social laughter. It helps foster feelings of trust, empathy, and connection between people.

In summary: Laughter is not caused by one specific hormone, but rather by a chemical cocktail that the brain releases to reduce stress, manage pain, and strengthen social ties.