I have weak hair around the perimeter of my head – front and along the nape. I can confidently review this product because my hair grew back and the texture was softer than previously after +2 weeks of use (twice daily).
And, because I am curious. I started using it on my sparse eyebrows. My brows are are much thicker. The tingling sensation was alarming at first, but I got used to it. The smell is very similar to that of the conditioner in the same range. I recommend this product to anyone with the same hair problems I had.