Users with easilyirritated scalp must run a smallscale patch test before use. The product obtains HETCAM invitro test result ES=8. Invitro test results do not mean compatibility for all people. Please consult a dermatologist if you have scalp inflammation. Note: These results are in-vitro laboratory model test results, for formulation R&D reference only. They do not represent equivalent effects on human body. Actual user experience may vary.