Positives

• Patients on chaga commonly describe clearer focus and a more stable immune baseline within two to four weeks of daily use, attributed to chaga’s beta-glucan immunomodulating and anti-inflammatory action PMC.

Negatives

• Chaga contains very high oxalate, and patients on prolonged or high-dose chaga have developed oxalate nephropathy, kidney stones, and even renal failure PubMed.
• Patients on high-dose chaga over time face documented kidney injury risk, raising concerns about prolonged daily use even at human-extrapolated doses Journal of Korean Medical Science.

Hurdles & Side Effects

• Chaga is high in oxalates, which can contribute to kidney stones; patients with urinary inflammation from Long COVID should be cautious and limit intake to a few times per week Reddit.