The Beauty Geek's Guide to Skin Care: 1,000 Essential Definitions of Common Product Ingredients by Burnes Deborah

Author:Burnes, Deborah [Burnes, Deborah]
Language: eng
Format: epub, pdf
Publisher: Rockridge Press
Published: 2019-05-20T16:00:00+00:00

L-ascorbic acid (vitamin C): One of the best and most useful forms of vitamin C in skin care, L-ascorbic acid is used as a skin lightening and brightening agent, to prevent and repair damage from sun exposure, for collagen synthesis, and to prevent and minimize fine lines and wrinkles. It is a powerful, highly effective, and widely used antioxidant .

Lactic acid: Next to glycolic acid , lactic acid is the most popular and researched alpha hydroxy acid . Its ability to penetrate the skin is not quite as profound as that of glycolic acid. Different concentrations produce different results. At 2% it begins to hydrate, at 5% it removes dead skin cells, and at up to 10% it provides a more profound and intense exfoliation. It can be derived from dairy milk although the most common forms in skin care are synthetic.

Lanolin: This thick substance, secreted by sebaceous glands in sheep to help keep their coats dry, can be separated into liquid lanolin oil and solid lanolin wax. Lanolin ingredients have excellent moisturizing abilities and are used in a wide range of cosmetic products, including baby and shaving products, as well as skin, hair, and nail care. Some studies have shown lanolin to be an allergen/irritant, while others conclude that there is low risk for reaction because of the negligible amount used in most body care products.

Laureth-4: This is a synthetic polymer composed of lauryl alcohol and polyethylene glycol ( PEG ). A clear, colorless liquid, it’s used as an antistatic and emulsifying agent in products such as shampoos, conditioners, body washes, foundations, and lipsticks. Although classified as safe for cosmetic use, there is strong evidence that it’s an irritant and, due to the presence of PEG, there is also concern about contamination with potentially toxic impurities such as 1,4-dioxane.

Laureth-7: Laureth-7 is a synthetic surfactant and emulsifier made from chemically modified natural fatty acid, lauric acid, and ethylene oxide. Compared to other laureths, it has relatively low viscosity and can be found in products such as foundations, moisturizers, serums, eye creams, and styling gels. There is some evidence that the lower the numerical value of a laureth, the higher the risk of irritation. There is also concern about contamination with potentially toxic impurities such as 1,4-dioxane.

Laureth-23: A synthetic derivative of lauryl alcohol , this is a clear, colorless liquid used as a cleansing and/or solubilizing agent in products such as shampoos, conditioners, hair gels, and shaving creams. Although classified as safe for cosmetic use, more research is needed as there are concerns about contamination, topical irritation, and/or toxicity.

Lauric acid: This is a medium-chain fatty acid abundant in coconut oil and also found in palm kernel oil and human, cow, and goat milks. It acts as a surfactant in products such as bar soaps, body washes, cleansers, and shampoos. Research suggests it has antimicrobial, antiviral, antibacterial, and moisturizing properties, making it beneficial in combating skin issues from acne to psoriasis to wrinkles. It’s considered nontoxic.

Lauroyl lysine: This naturally occurring amino acid is derived from coconut fatty acid.

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