From my perch on the engine cover of a special operations gunboat, I can see the source of this weird racket--someone on one of the other boats gliding down Kentucky's Salt River is firing a minigun into the woods. Every second, hundreds of 7.62 mm bullets pour out of the spinning machine-gun barrels.
Cetyl and stearyl alcohol, both typically used in hair conditioners, work together and separately with other ingredients to make hair softer and silkier after a washing. Fatty alcohols make up part of the base of the conditioner formula.
Benzyl alcohol and cetearyl alcohol are not really at all similar, so it is really bad luck to be allergic both. Cetearyl alcohol despite its chemical name is pretty natural so it is quite likely to be used as an ingredient in natural products.