Nausea, a rash or unusual tiredness after reishi is not an established ‘healing crisis’. Symptoms may indicate an adverse reaction, an interaction or an independently occurring illness. They do not prove that toxins are leaving the body.
Take new symptoms seriously
Pause reishi and note the timing, the preparation used, other supplements and medicines. Seek medical advice if symptoms persist or become more severe. Taking it again as a test is not suitable self-help when a severe reaction is suspected.
What is known about liver risks
There are isolated reports of liver injury associated with reishi products. Other causes are often not adequately excluded, so a causal connection is not established in every case. LiverTox classifies reishi as a possible rare cause. These reports cannot establish a reliable frequency for any particular product.
Yellow skin or eyes, dark urine or pain in the upper right abdomen require prompt medical assessment. Get immediate medical help for breathing difficulties, facial swelling or severe circulatory problems.
Consider the preparation and medicines
Powders, extracts and combination products differ; findings cannot be freely transferred between them. Have use reviewed by a professional beforehand if you take anticoagulants or immunosuppressants, or have existing liver disease. Laboratory findings on potential interactions do not prove a clinical effect for every combination, but warrant careful review.
Frequently asked questions
Should I keep taking it despite symptoms to detox?
No. There is no reliable evidence for this interpretation. You should not accept worsening symptoms through continued use.
Does a timing link prove a side effect?
It is a clue, but not proof. Other illnesses or preparations must also be considered when assessing the cause.
Sources
LiverTox: Lingzhi, Reishi; Memorial Sloan Kettering: Reishi Mushroom
