Erica Douglas AKA Sister Scientist
Erica Douglas is the second source that I have seen thoroughly debunk the old junk science hair porosity test and provide a real explanation of determining your hair porosity. She effectively breaks down hair science into simple terminology in a must see series on YouTube that more naturalistas need to be exposed to. Her Fact or Crap video covers her professional opinion on Apple Cider Vinegar for hair and products that make hair growth claims. Erica holds a BS in Chemical Engineering and a MBA.