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- **Ashwagandha**: Reduces cortisol by regulating the HPA axis. A 2019 *Phytomedicine* study showed up to 30% cortisol reduction in stressed individuals.
- **Rhodiola**: Balances cortisol via HPA axis modulation. A 2017 study in *Neuropsychiatric Disease and Treatment* found it reduced cortisol in burnout patients.

Both help mitigate stress-related cortisol spikes, aiding insomnia.