Elana asks…Just wondering what are stearyl trimethylammonium chloride and cetyltrimethylammonium chloride and what could they possibly be doing in my hair product? Are they of natural origin or completely synthetic? Also, are they safe and can they weight down the hair? The Right Brain responds: As astute Alchemist pointed out in our Forum, we call [...] Read more: What are These Chemicals Doing in my Conditioner?