Reishi mushroom (Ganoderma lucidum) is one of the most famous and highly revered tonic herbs of all time! Reishi has been used in Traditional Chinese Medicine (TCM) for thousands of years to strengthen the immune system, reduce stress, increase energy, and promote healthy aging and longevity. Reishi is regarded as the best "spirit elevating" (Shen) tonics that positively promotes mental well-being, calmness, and helps cultivate more peace, love, and happiness in one's life.