Definition and efficacy of cosmetics
release time：September，03，2019
Cosmetics in a broad sense refers to cosmetic items, specifically articles that are used to cleanse and beautify the human body, increase glamour, change appearance, keep skin and hair and body, rub, spread to the body, or use similar methods. The word "makeup" in Greek is "decorative technique", which means to increase the advantages of the human body and to make up for the defects. Japan's definition of cosmetics is "to keep the body clean, to beautify the human body, to increase its charm, to change its appearance, or to maintain the health of the skin or hair, to apply it in the body, to spread it, or the like, and to use it on the body. The item that plays a mitigating role is called cosmetics."The EU's “Cosmetics Regulations” have a regulatory definition of cosmetics: “Cosmetic refers to contact with external organs of the human body [skin, hair, nails, lips and external genitals] or dental and oral salaries) Membrane, a substance and preparation whose main purpose is to clean, scent, improve appearance, improve body odor, or protect the body to maintain good condition. "According to the European Union's definition of cosmetics, oral hygiene products, including fluoride toothpaste, are cosmetics, but products that are ingested by injection or by injection are not cosmetic. From the regulations, the EU does not have ordinary cosmetics and functional cosmetics. There is no classification of prescription drugs and over-the-counter drugs in the regulations of drugs. Therefore, there is no confusion or distinction between cosmetics and over-the-counter drugs.
The US Food and Drug Administration's document on cosmetics describes cosmetics as "cosmetic products are introduced or used on the surface of the human body by friction, pouring, spraying, coating, etc., for cleaning, beautifying, enhancing charm, changing appearance without affecting The structure and function of the body." The classification of cosmetics mainly includes skin care, aroma, eye and eye external modifications, hair care (dyeing hair, shampoo), body odor remover, facial modifier, baby products (Shampoo, lotion and talcum powder), body wash, oral cleanser and sunscreen products.
In 2002, the Department of Health Legal System and Supervision of the Ministry of Health of the People's Republic of China issued the "Hygienic Standard for Cosmetics" (2002 edition), which defines cosmetics as: "Applicable to any part of the human body surface by painting, spraying or other similar methods ( Skin, nails, lips, oral membranes, etc., in order to achieve clean, eliminate bad smell, skin care, beauty and modification purposes.
The effect of cosmetics on the human body must be moderate, safe, non-toxic, and free of side effects, and mainly for the purpose of cleaning, protection, and beautification, and can not affect the structure and function of the human body.
Cosmetics have the following commonalities:
(1) Surface activity The surface activity of most cosmetics mainly comes from two aspects, one of which is derived from the multiphase dispersion system of cosmetics, the particles are small, the surface area is large, and the surface activity is high; the other is from the surfactant as a cosmetic. The main auxiliary raw materials, often added to various types of cosmetics, provide the surface activity of the system.
(2) Colloidal dispersibility In the preparation of cosmetics, some components are usually dispersed in another phase medium in the form of very small liquid or solid particles, forming a multiphase dispersion system. Therefore, cosmetics are mostly colloidal. Dispersion system with colloidal dispersibility. Unlike the true solution, the multiphase of the colloidal dispersion has non-uniformity; the composition is uncertain; there is instability due to the tendency to coalesce.
(3) Rheology As a fluid and deformable product, the rheology of cosmetics comes from its own private elastic structure. Rheological properties are common characteristics of creams, lotions, and toothpastes. These properties are derived from the internal structure of the product, but affect both the use of cosmetics and the formulation and development of cosmetics.
(4) Highly safe cosmetics are a kind of consumer products used in daily life of human beings. They are used almost every day and have the persistent characteristics of use. They are long-term products. It is particularly important to strictly require the safety of long-term use, which has become a common feature of cosmetics. In fact, the safety requirements for cosmetics have been raised at the raw material stage.
