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Iatrogenic: Illness, disease, or imbalances created by medical or non-medical treatments that were not present before treatment.

Ichthyosis: A hereditary disorder of keratinization; a genetic skin diseases characterized by the presence of excessive scales

Immune System: Intricate mix of cellular, molecular, and antibody components (proteins) that protects the body against foreign invaders.

Immunity: The ability to resist infection and to heal.

Immunoderm-atology: The science that studies dermatological diseases involving the immune system.

Immunostimulant: An agent that stimulates either innate or acquired immunity.

Immunosuppressant: An agent that acts to suppress the body's natural immune response.

Inaidazolidinyl Urea: A by-product of human metabolism used as an anti microbial agent.

Indigotine: The common name for uncertified FD&C Blue No. 2.

Indolent: A sluggish and unresolving condition, often with ulcerations and necrosis.

Indium: An ionic plant source trace mineral.

Inflammation: A condition of the skin characterized by fever, redness, swelling, pain or itching and failure of the function of that body part or system.

Influenza: Commonly called the flu , influenza is a virus that infects the respiratory tract and may cause fever, headache, and general body aches, runny nose, sore throat, or cough.

Infusion: Tea made by steeping an herb's leaves or flowers in hot water.

Inorganic: Being composed of matter other than plant or animal, such as minerals.

Inositol: Helps prevent thinning hair. Vitamin B; an emollient.

Insoluble: Unable to dissolve in another substance.

Instant Conditioner: A conditioner with light to intense conditioning properties that restores a healthy look and protects against further damage.

Insulin: A hormone that promotes the transfer of sugar into the body cells for energy production.

Intravenous: Fluid providing nutrition, water or medication injected directly into a vein.

Intrinsic: Native or inherent in the thing.

Intrinsic factor: A mucoprotein normally secreted by the epithelium of the stomach and that binds vitamin B12, the intrinsic factor/B12 complex is selectively absorbed by the distal ileum.

Invertase: Beta-fructofuranosidase (invertase) The enzyme invertase breaks starch down into complex sugars, then simple sugars, and finally alcohol. Validase Invertase is a dry food grade invertase enzyme preparation (beta-fructofuranosidase) derived from yeast. Validase Invertase catalyzes the hydrolysis of sucrose (cane or beet sugar) into its component parts, D-fructose and D-glucose. Essentially, it is used for the rapid hydrolysis of sucrose to produce invert sugar solutions.

In Vitro: From the Latin meaning in the living body. In vitro tests do not involve the use of living vertebrate animals. Note: In vivo studies are conducted using animals.

Iodine: The condition of the hair, skin, & teeth are dependent upon a well-functioning thyroid gland.

Irish Moss: Irish moss is used as a stabilizer in such dairy products as ice creams, sherbets, chocolate milk, yogurt and whipped cream. In its raw form, Irish moss is used as a bulk laxative, which also coats and soothes the entire gastrointestinal tract. In various forms, it alleviates peptic and duodenal ulcers in humans while having no adverse effects on the colon.

Iritis: Inflammation of the iris of the eye.

Iron: Iron is a mineral that occurs in both plant and animal tissue. Its major function is to combine with protein and copper in making hemoglobin. Hemoglobin transports oxygen in the blood from the lungs to the tissues, which need oxygen to maintain basic life functions. Iron builds up the quality of the blood and increases resistance to stress and disease. It is also necessary for the formation of myoglobin, which is found only in muscle tissue. Myoglobin supplies oxygen to muscle cells for use in the chemical reaction that results in muscle contraction. Iron also prevents fatigue and promotes good skin tone.

Iron Oxides: Natural oxides of iron (iron combined with oxygen) varying in color from red to brown, black to orange or yellow, depending on the degree of water added. Inorganic pigments approved for cosmetic use, including the eye area.

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.

Isobutane: Naturally occurring gas.

Isopropanol: (Isopropyl Alcohol) An organic solvent of alcohol family. Used to solubilize resins and polymers. Also found in hair colors to dissolve the oxidation dyes.

Isopropyl Alcohol: See Isopropanol.

Isopropyl Lanolate: A synthetic moisturizer.

Isopropyl Myristate: An emollient and lubricant that reduces the greasy feel of products by replacing other, oilier ingredients. A synthetic moisturizer.

Isopropyl Palmitate: An ester of palmitic acid from coconut oil used to impart silkiness to the skin and hair. A synthetic moisturizer.

Isotonic: Having the same salinity as body fluids.

Ivy: A mild irritant botanical that has toning and tightening properties. It is believed to stimulate blood circulation to the areas on which it is applied.

Ivy Extract: A natural diuretic and cleansing extract that is well known for its skin firming and tightening actions.