Immunostimulant: An agent that stimulates either innate
or acquired immunity.
Immunosuppressant: An agent that acts to suppress the
body's natural immune response.
Instant Conditioner: A conditioner with light to intense
conditioning properties that restores a healthy look and
protects against further damage.
Irritant: A substance that consistently and predictably
produces an adverse response (such as reddening, swelling,
itching, burning, or blistering) in virtually all of the
population. Irritants are not to be confused with allergens.