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Lactamide MEA: See Acetamide MEA.

Lactase: An enzyme that is needed to digest lactose (sugar found in milk products).

Lactic Acid: Dermalogica uses a lactic acid derived from molasses to retexturize the skin’s surface and to stimulate cell renewal. Lactic acid is an alpha hydroxy acid with three carbons, thus it helps diminish the cohesion of surface skin cells (assists in cell detachment from the lower layers of the stratum corneum) and prevents the thickening of the stratum corneum. This results in smoother more flexible skin. Lactic Acid also has a larger molecular size than glycolic acid and is absorbed more gradually across the epidermis with less irritation.

Lactose: A complex sugar found in milk and milk products. Lactose must be broken down by lactase into the simple sugars galactose and glucose to be absorbed.

Lake Colors: Dyes that don't dissolve in water that result in less color leaching. Examples include coated tablets and hard candies.

Lamellar Granule: Small oval granule that contains mainly lipids; produced in the prickle cell layer.

Laneth-10 Acetate: The polyethylene glycol ether of lanolin alcohol; an emulsifier – thickening agent.

Langerhans Cell: Epidermal cell that is an important immunologic defender.

Lanolin: A natural extract of sheep wool used as a moisturizer that is a common cause of allergic reactions, but is rarely used in pure form. Obtained from the wax found on sheep's wool, it is an excellent emollient, skin lubricant and protectant, capable of absorbing water in an amount equal to 50% of its weight. It is rich in cholesterol and other skin-friendly sterols.

Lanolin Alcohols: Distilled and deodorized solid with excellent emolliency to skin and hair. Contains up to 30% cholesterol and related sterols.

Lappa Extract: An extract from Burdock root that contains tannic acid. Lappa extract is used to soothe the skin and contains vital mineral salts.

Lauramide DEA: A mixture of ethanolamides of lauric acid. A high foaming cleansing agent (surfactant) for shampoos, bubble baths, etc.

Laureth-3: It is the polyethylene glycol ether of Lauryl Alcohol, principal alcohol of coconut oil. It's used as a skin smoothener and softener (emollient) and thickening agent (emulsifier).

Laureth-23: The polyethylene glycol ether of lauryl alcohol. A thickening agent (emulsifier).

Lauroamphocarboxyglycinate: Mild, foaming amphoteric organic compound used as a skin surface-cleansing agent (surfactant) for shampoos and facial cleansers.

Lavender: An effective herb for headaches, especially stress related headaches and is effective as an anti depressant. It is also a gentle strengthening tonic of the nervous system it may be used in states of nervous debility and exhaustion. It can be used to soothe and promote natural sleep. Externally the oil may be used as a stimulating liniment to help ease the aches and pains of rheumatism. Lavender’s actions include: carminative, anti-spasmodic, anti-depressant, rubefacient, emmenagoguem, and hypotensive.

Lavender Extract: Anti-inflammatory and skin soothing agent.

Lavender Flowers: An aromatic that stimulates and cleanses the skin.

Lavender Oil: An antiseptic and anti-inflammatory that is effective in treating acne, dermatitis and oily skin.

Laxative: Promotes bowel movements.

Lecithin: A natural anti-oxidant and emollient mainly derived from common egg yolk or from naturally occurring phospholipids derived from soybeans. Lecithin helps protect the skin, soften the skin and replenish the acid mantle.

Lemon Extract: Lemon extract is refreshing and purifying to the skin. It is extremely active when applied to an oily skin condition. Lemon Extract is a natural purifier, cleanser, astringent, decongestant and tonic. It also can help prevent skin discoloration.

Lemongrass: Used for sheen and cleansing. Also used as an elasticizer in hairsprays.

Lemongrass Oil: Cleansing and purifying to the skin, the oil is used for its excellent antiseptic properties. The oil also helps normalize oil production and reduce breakouts. It is high is vitamin A and can be found in bath and facial herb blends.

Lemon Oil: Used for its antiseptic and astringent properties as well as its detoxifying effects.

Lemon Thyme: An aromatic, antiseptic, diaphoretic, stimulant, disinfectant that has many useful applications. As part of a bath tisane or facial sauna, it helps to soothe and smooth skin.

Lesion: Any detectable change from normal structure and/or function.

Leukocytes:   White blood cells.

Leukocytosis: Abnormally high white blood cell count, usually the result of a non-viral infection.

Leukopenia:   Having an abnormally low white blood cell count.

Lichen Extract: It is a bactericide, fungicide. It is effective against yeast. It is used in deodorants, foot care products, mouth hygiene, and antimicrobial washes.

Lichenification: Thickening of the epidermis. Lichenified skin looks dry and leathery, and the normal skin markings are exaggerated. Repeated rubbing and scratching can produce lichenification.

Lichen Simplex Chronicus: Chronic disorder produced by the patient’s repeated scratching and rubbing. Lichenified plaques appear on the ankles, sides of the neck, genital areas, scalp, and upper back.

Licorice Extract: Inhibits melanin biosynthesis while scavenging free radicals (antioxidant). Treats acne and calms allergic skin.

Licorice Root organic: Great facial steaming herb used to open and soothe the pores so that other herbs may cleanse and medicate them.

Limbic System: A functional system in the brain generally considered to mediate emotions with metabolism.

Linden: Linden is a relaxant used in nervous tension and some forms of migraine. It has a reputation as a prophylactic against the development of arteriosclerosis and hypertension. It is used to combat high blood pressure associated with arteriosclerosis and nervous tension. Linden’s actions include: nervine, anti-spasmodic, hypotensive, diaphoretic, diuretic, anti-inflammatory, emmenagogue, and astringent.

Lineolamido Propyl Ethydimonium Ethosulfate: Antistatic and hair conditioning agent.

Liniment: A topical liquid (alcohol, oil or water preparation) containing therapeutic agents for topical application.

Lipid: Generally, these are organic products found in living systems that are insoluble in water, like fats. Cell membranes are made of lipids. We lose lipids as we age, which is why skin becomes less supple. Broadly, it means true fats (like triglycerides), lipoids (like phospholipids) and sterols (like cholesterol).

Lipophilic: Having an affinity for lipids.

Lipoprotein: Any of the lipid-protein complexes in which lipids are transported in the blood.

Liposomes: Microscopic sacs manufactured from natural or synthetic fatty substances that include phospholipids (components of cell membranes). Phospholipids can trap any substance that will dissolve in water or oil. Liposomes act like a delivery system, depositing product ingredients into the skin. When the liposomes "melt" the ingredients, such as moisturizers, are released.  

Liquid Crystal Cholesteric Esters: Microencapsulated strands of cholesterol lipids for skin repair and moisturizing. Highly absorptive crystals carry active ingredients into the deeper layers of the epidermis.

Liquorice: Liquorice affects the endocrine system and liver, amongst other organs. As an anti-hepatotoxic it can be effective in the treatment of chronic hepatitis and cirrhosis. Liquorice is used in allopathic medicine as a treatment for peptic ulceration, a similar use to its herbal use in gastritis and ulcers. Caution: It is best to avoid Liquorice if you have hypertension, kidney disease or during pregnancy. Liquorice’s actions include: expectorant, demulcent, anti-inflammatory, anti-spasmodic and mild laxative.

Lobelia: Actions: Anti-asthmatic, anti-spasmodic, expectorant, emetic, nervine. Indications: Lobelia is a useful systemic relaxants. It has a general depressant action on the central and autonomic nervous system and on neuro-muscular action. Its primary specific use is in bronchitic asthma and bronchitis. Lobeline is a powerful respiratory stimulant that will stimulate catarrhal secretion and expectoration while relaxing the muscles of the respiratory system.

Lotion: A dermatological vehicle like Calamine Lotion (a suspension of insoluble powder in a liquid) or a pourable emulsion of oil in water, often called creamy lotions.

Lubricant:   An oil or oil rich crème or lotion designed to lubricate the skin and slow moisture loss.

Luffa - Loofah: A long vining plant (resembling a cucumber plant) bears fruit, that, once dried and washed of rind and seeds, gives us a wonderful body scrub! It helps stimulate circulation as well as exfoliate dead skin cells.

Lumbar Region: The lower back five segments of the spinal chord and column, between the sacrum and thoracic regions.

Lupus Erythematosus: An autoimmune disorder in which a variety of skin lesions appear.

Lymph: A transparent, slightly yellow liquid of alkaline reaction, found in the lymphatic vessels and derived from the tissue fluids. Lymph is collected from all parts of the body and returned to the blood via the lymphatic system.

Lymphocyte: White blood cell manufactured in the bone marrow, lymph, nodes, and spleen. There are two types: B cells and T cells.

Lymphokines: Substances released by sensitized lymphocytes on contact with specific antigen. Lymphokines help affect cellular immunity by stimulating macrophages.

Lysine style='mso-bidi-font-style:italic'>: An essential Amino Acid that helps form collagen (which makes up bone cartilage & connective tissues); aids in the production of antibodies, hormones & enzymes. A deficiency may result in hair loss.