Laughter Yoga and Cortisol: Can Laughing on Purpose Lower Stress Hormones?

"Laughter is the best medicine" is an old saying, but it has picked up a new, science-flavored version online: laughter yoga clubs, laughter breathing exercises, and short videos promising that a few minutes of forced giggling will "flush out cortisol" and give you calmer, glowing skin. There is some real research behind the idea that laughter affects the stress response. The question is how strong that research is and how far it can be stretched.

The most-cited recent evidence is a 2023 systematic review and meta-analysis in PLOS ONE by Kramer and Leitao. The authors pooled eight interventional studies with a total of 315 participants, half of them randomized controlled trials, that compared a laughter intervention with a control condition and measured cortisol. Pooled results suggested cortisol was roughly 32 percent lower after laughter compared with controls, and even single sessions were associated with a noticeable drop. That is a striking headline number, and it is a legitimate peer-reviewed finding.

The fine print matters, though. Eight studies is a small evidence base, the individual trials were modest in size, and the interventions varied widely, from watching comedy videos to guided group laughter sessions. Most studies measured cortisol shortly after a session, so they tell us about short-term changes rather than whether regular laughter lowers cortisol over months. Cortisol also follows a strong daily rhythm and responds to many factors, such as time of day, social contact, and simply relaxing in a pleasant setting, which makes it hard to know how much of the effect comes from laughing itself versus the overall experience.

Laughter yoga, developed in India in the mid-1990s, is a specific approach that uses deliberate, non-humorous laughter combined with breathing and group interaction, on the theory that the body responds to laughing even when it starts out forced. A 2019 systematic review and meta-analysis in Social Science and Medicine by van der Wal and Kok found that laughter-inducing therapies were associated with improvements in depression and some other outcomes, and that non-humorous, simulated laughter showed larger effects than humor-based approaches. However, the authors rated the overall quality of evidence as low and described the field as not yet mature.

What about skin? This is where the marketing gets ahead of the science. There are no solid trials showing that laughter practices improve acne, eczema, rosacea, or "cortisol face." The logic that lower cortisol could eventually benefit stress-sensitive skin is plausible in broad terms, since chronic stress is associated with flares of several inflammatory skin conditions, but plausibility is not proof. Any skin claim attached to laughter yoga is a guess built on a short-term hormone change, not a demonstrated outcome.

So what is proven and what is trend? Reasonably supported: laughter sessions are associated with short-term drops in cortisol and may modestly help mood and perceived stress. Unproven: that laughter is a reliable way to lower chronically high cortisol, or that it treats skin conditions. Trend and marketing: framing laughter as a cortisol "detox." Because laughter yoga is low-cost and low-risk for most people, it can be a perfectly reasonable addition to a stress-management routine if you enjoy it. People with recent abdominal surgery, uncontrolled high blood pressure, or certain lung or heart conditions may want to check with a clinician before vigorous laughter exercises, and it should not replace treatment for anxiety, depression, or skin disease.