Nadi-Shodhan (alternate nostril breathing) works mainly by regulating the autonomic nervous system through slow, controlled, alternating airflow. Looking at its benefits through this physiological lens gives four clear advantages.
Activates the parasympathetic nervous system: The slow, deliberate breathing pattern shifts the body away from the fight-or-flight (sympathetic) state and toward the rest-and-digest (parasympathetic) state, which is why practitioners feel calmer and less anxious after a session.
Improves oxygen-carbon dioxide exchange: Alternating nostrils forces full, deep inhalation and exhalation through each nasal passage in turn, which trains the lungs to work more efficiently and increases the amount of oxygen reaching the bloodstream.
Balances left and right brain activity: Because each nostril is loosely associated with activating the opposite brain hemisphere, alternating airflow is believed to even out logical and creative brain activity, supporting sharper focus and mental clarity.
Supports healthy blood pressure and heart function: The calming effect on the nervous system also reduces the workload on the heart, helping to bring down elevated blood pressure and improve overall cardiovascular efficiency over regular practice.
Together, these four effects, nervous system calming, better respiratory efficiency, hemispheric balance, and cardiovascular support, make up the core benefits of practising Nadi-Shodhan pranayama.

