To answer this let us start with a question
How much of real neem, your favorite neem face wash has?
Maybe 5%. What about the rest 95%?
It is either water or chemicals loaded with harsh preservatives. Similar is the case with any popular cosmetics product like your favorite coffee scrub or onion oil, or apple cider vinegar shampoo.
Chemicals are cheap, and water is of negligible cost, so most companies add just a few drops of natural ingredients on top of chemicals & water-heavy cosmetic products to make people believe that they are buying genuine natural products.
Such diluted hair/skin care products do more harm than good. If we really want to give best possible nutrition to our precious hair/skin, we need to use all natural, zero dilution products only.