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Patch Testing Before applying any new product to your scalp, perform a patch test

10.1016/j.ejmech.2018.09.027 301 WangX.-M.LiuX.-M.WangY.ChenZ.-Y

Genetics: Some people respond better to certain medications due to genetic makeup

However, if any particulate matter remains undissolved or the solution remains cloudy, the vial should be discarded for safety
