A fungus found worldwide that grows saprophytically on tree bark. Used in traditional Chinese medicine as a fortifier and stimulant of the immune system. Contains polysaccharides (glucans), triterpenoids (ganoderic acid) and ergosterols. There is insufficient evidence of its effectiveness in the treatment of cancer (Jin 2016, MedlinePlus 2015), or in cardiovascular disease (Krupp 2015, MedlinePlus 2015), or in any other condition, such as hepatitis, asthma, bronchitis, high blood pressure, immune deficiency, fatigue, insomnia, etc. (MedlinePlus 2015). Excessive use or high concentrations for more than one month may be toxic to the liver (MedlinePlus 2015, Gill 2008, Wanmuang 2007). Since the last update we have not found any published data on its excretion in breast milk. Given its lack of toxicity at the right doses, moderate use would be compatible with breastfeeding. Precautions when taking plant preparations: 1. Ensure that they are from a reliable source: poisoning has occurred due to confusing one plant with another with toxic properties, as well as poisoning from heavy metals extracted from the ground and food poisoning due to contamination with bacteria or fungi. 2. Do not take in large amounts; follow recommendations from professional experts in phytotherapy. "Natural" products are not always good in any quantity: plants contain active substances from which much of our traditional pharmacopoeia has been obtained and can result in poisoning or act as endocrine disruptors if taken in excessive amounts or time periods.