Quality.
I can not say enough about how much I love this product.  The ease in which my body processes these all natural substances is amazing.  Only having used Heart and Soil for a short time, I notice a significant difference in my hair quality and nail growth.  As someone who works with my hands for a living my nails are constantly chipping and my hands felt stiff at the end of a long day.  That has changed since being introduced to Heart and Soil.  Try it... you will not be disappointed.
Rating: 5 stars