How to use it
Three times a week, 20-30 minutes somewhere that feels like nature to you: a park, the shore, a line of trees. No phone, no workout needed. That's where the stress drop per minute is biggest.
How sure we are
P Evidence: promising. Good studies, but small or few. Use it and keep checking.
Sources
In 36 city dwellers over 8 weeks, time in nature lowered cortisol about 21% an hour beyond its normal daily drop; the best return per minute came at 20-30 minutes (Hunter, Gillespie & Chen 2019, 🟡).
Not medical, legal or financial advice.