After recovering from Covid-19 my hair began to fall out at an alarming rate, apparently not an unusual aftereffect. To be honest, I am using the ShapiroMD shampoo along with another brand of 'natural' hair growth serum AND rogaine. I had been using the other two products for a few years, but when I added the ShapiroMD shampoo it was nearly miraculous: no more clumps of hair in the drain or in the hairbrush. I am satisfied.