Reishi tea is quite easy to make, and has various health benefits. However, it may cause allergic reactions in some individuals. It may also cause side effects such as dizziness, insomnia, stomach discomfort, dry mouth, or tiredness. To avoid these, its consumption should be limited to just 1 tbsp., initially. If it does not cause any side effect, it can be gradually increased to 2 tbsp., then a cup, and so on. Ideally, a person should consume 2 oz. of the tea twice a day, to derive maximum health benefits.