Stylist, are you sure that you want to "condition" another person's hair with short-chain proteins?

The smallest protein catalogued to date is found in Gila Monster saliva and is direly poisonous.  Its hemotoxic and neurotoxic effects are like those of any other short-chain protein.

Longer chain proteins (chitin, keratin, etc) would show far greater remedial effect on damaged hair.  These proteins are among the longest and heaviest known.  Even so, nothing can remedy the effects that ammonia and hydrogen peroxide have on any long-chain protein.

Because of the extreme toxicity of short-chain peptides and proteins, these agents are not available to the general public.  Just a tiny prick on the skin while short-chain proteins are applied would be rapidly lethal.

All vertebrate venoms are comprised of short-chain proteins.  Many are nontoxic to humans, but are rapidly lethal to rodents, canines, and felines. 

Arthropod venoms often include a non-protein synergist to rapidly subdue the prey animal, inflict tremendous pain in their "defensive" mode, and all too often include both.  Short-chain proteins may be grouped as follows:

Cytoxic: kills living cells.  Crotalus Atrox isolates have been used to treat certain rapidly expanding cancers.  However, its use is still hotly debated because of the nearly unacceptable toxicity to healthy tissues.

Hematoxic: kills red and white blood corpuscles.  Most poisonous snakes have at least one hematoxic effect, which is generally the mechanism of death in prey animals.

Neurotoxic: kills or disables central and peripheral nervous system function.  Thousands of vertebrates and invertebrates use this rapidly lethal toxin to immobilize their prey, yet none renders the victim unconscious.  One animal is the exception: the cone snail.  It sports a veritable witch's brew of neurotoxins.  Persons envenomated with this lethal animal's toxin seldom report severe pain.  But they become rapidly paralyzed and death usually follows in a few minutes.

Other animals sport slightly longer chain peptides and proteins, such as the Australian Box Jellyfish, and Irukondji Jellyfish.  Both are rapidly lethal in the usual mode of attack, and if one survives, the agony is so severe that no narcotic will ease the pain.  Medical professionals often induce coma to deal with the pain of these short-chain proteins.

http://en.wikipedia.org/wiki/Venom