Alternate-nostril breathing (Nadi Shodhana, a few slow, steady cycles) is an old practice with a real but uneven evidence base — a decent tool for slowing down, without certainty it beats plain slow breathing.

noli's read

A systematic review of 44 randomized trials (2017) reports a 'high level of evidence' for positive autonomic and cardiopulmonary effects from regular alternate-nostril practice — but ten of those studies carried high risk of bias, and the technique itself isn't well standardized across studies. The best-controlled acute-stress trial (Kamath et al. 2017, using a public-speaking stress model, n=30) found only a non-significant trend toward lower anxiety — not a confirmed effect. A more recent crossover study (2025, n=45) further shows the effect depends on each person's baseline dominant nostril, which complicates any blanket claim like 'this calms everyone within 5 minutes.' The listed benefits (easier sleep, clearer head, less 'wired' energy, looser jaw and shoulders) line up with the generic slow-breathing effect documented elsewhere, rather than an effect specific to alternating nostrils. Verdict: mixed — a plausible, longstanding practice with real but heterogeneous evidence, and sometimes non-significant on the exact immediate effect claimed.

the sources

1. 1Zaccaro A et al. 2018