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Reishi was traditionally used as a tonic to strengthen vital energy or "Qi", and was though to help support balance and inner strength.. Reishi (Ganoderma lingzhi), also known as the "Mushroom of Immortality" has been used in Chinese Medicine for at least 2,000 years and has been documented in some of the earliest pharmacopoeia texts in Asia. HealthForce Superfoods Integrity Extracts Reishi Mushroom Powder 2.