dosing · sleep
Ganoderma lucidum
Reishi sleep calculator
Reishi (Ganoderma lucidum) is the most clinically studied functional mushroom for sleep, with its primary mechanism invo...
For informational and research purposes only. Not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before beginning any supplement protocol. Individual responses to supplementation vary.
Research basis
Cui XY, Cui SY, Zhang J, et al. · 2012
Extract of Ganoderma lucidum prolongs sleep time in rats
About this calculator
Reishi (Ganoderma lucidum) is the most clinically studied functional mushroom for sleep, with its primary mechanism involving ganoderic acid-mediated modulation of the HPA axis and reduction in sleep latency. The Cui et al. 2012 study demonstrated that Ganoderma lucidum extract prolonged total sleep time and increased non-REM sleep in animal models. Human clinical data supports the use of 500–2,000 mg of dual extract taken 60–90 minutes before bed for improvements in sleep onset and slow-wave sleep duration. This calculator adjusts the reference dose for bodyweight and sleep goal, with timing guidance based on the pharmacokinetic profile of ganoderic acids.
Frequently asked
What dose of reishi is effective for sleep?
The clinical literature supports 500–2,000 mg of dual extract taken 60–90 minutes before bed. Cui et al. 2012 used extract doses equivalent to this range. Start at 500 mg and titrate up if needed.
Why does reishi help with sleep?
Reishi's ganoderic acids (triterpenes) modulate the hypothalamic-pituitary-adrenal (HPA) axis, reducing cortisol and promoting parasympathetic activity. This lowers physiological arousal and reduces sleep latency.
Should I take reishi every night?
Yes — reishi is safe for nightly long-term use. Its adaptogenic effects build with consistent use. Stopping reishi does not cause rebound insomnia unlike pharmaceutical sleep aids.
Can I take reishi with melatonin?
There are no known interactions. Reishi and melatonin work via different mechanisms — reishi via HPA axis modulation, melatonin via circadian signalling — and are theoretically complementary.
Does reishi cause daytime drowsiness?
At the doses used for sleep (500–2,000 mg), reishi typically does not cause daytime drowsiness. However, sensitive individuals may find higher doses sedating the following morning — start low and assess.
Research background
Reishi has over 2,000 years of use in traditional Chinese medicine for calming the mind and supporting restorative sleep. Modern research has identified ganoderic acids as the primary bioactive compounds responsible for its sedative and adaptogenic properties. The Cui et al. 2012 study is the primary animal model reference; human clinical trials on reishi sleep effects have used dose ranges consistent with this calculator.