How do you actually lower cortisol?

What is cortisol actually doing?

Cortisol is the main stress hormone, released by the adrenal glands under instruction from the brain. It mobilises energy, sharpens attention and dampens processes the body can postpone. It follows a daily rhythm, peaking shortly after you wake and declining through the day.

Two things follow that get lost in the wellness framing. Cortisol is necessary, so the goal is a healthy rhythm rather than the lowest possible number. And a single measurement tells you very little, since it swings with time of day, sleep, food, exercise and the hour you had before the test.

What lowers it most?

Yoga, on the best available comparison. A 2025 network meta-analysis of 44 randomised trials covering 3,284 people with psychological distress found yoga produced the largest cortisol reduction at SMD −0.59, ranking first with a SUCRA of 93 per cent. Qigong came second, followed by multicomponent exercise.

Li, Huang and Zhu published this in Sports. A network meta-analysis is well suited here because it compares interventions against each other rather than each against nothing, which is what you actually want to know when choosing between them.

The certainty ratings are worth carrying. Evidence ranged from very low to high, and only the yoga against control comparisons earned the highest rating. Cortisol measurement methods varied considerably between studies.

Is more exercise better?

No, and this is the most useful finding in the analysis. The dose-response followed an inverted U, with the optimal effect at roughly 530 MET-minutes a week, which is about 90 to 150 minutes of moderate activity. Yoga peaked slightly higher at around 630.

Past that point the benefit falls away. Training harder does not lower cortisol further, and one modality reversed the effect entirely.

High-intensity interval training tended to increase cortisol rather than reduce it. That makes physiological sense, since hard intervals are themselves a stressor, and it matters for anyone using punishing workouts as stress management. HIIT has real benefits, and lowering cortisol in a distressed person is not among them.

What about the rest of the advice?

Mindfulness-based stress reduction has supporting evidence, with reviews associating mindfulness meditation and related practices with lower cortisol. That sits alongside the movement finding rather than competing with it, since the top-ranked modalities here are mind-body practices.

Sleep is the piece most often skipped. Short and disrupted sleep alters the cortisol rhythm directly, so an evening spent optimising supplements at the cost of an hour in bed works against itself.

Be sceptical of cortisol-lowering supplements and of any test sold on a single reading. The rhythm is what carries meaning, and one saliva sample cannot describe it.

What should you actually do?

Aim for around 90 to 150 minutes a week of moderate movement, and choose a mind-body form if reducing cortisol is the goal. Yoga has the strongest evidence, qigong is close behind, and both are gentler than what most stress advice recommends.

Keep hard training if you enjoy it, and stop treating it as stress relief. If you are already depleted, an intense session is another demand on the same system.

Protect sleep before optimising anything else, and treat any single cortisol number with suspicion.