Shelf life

Obviously, isn't it? However, there are some nuances.

If the manufacturer promises a shelf life of a product of up to three years or more, then it contains preservatives and other not very useful substances.
Good cosmetics, if taken in general, has a shelf life of not more than six months.

Composition

High-quality products instead of harmful preservatives contain natural substances: benzoic acid, sorbic acid, vitamin E, grape seed extract, jojoba oil, aloe vera. Such cosmetic products should sometimes be stored in the refrigerator. This moment in the instructions and annotations must be specified.

But to substances that are often found in the composition and which should be avoided, include:

Propylene glycol, which causes a lot of allergic reactions and irritations, as well as the appearance of acne.
Sodium lauryl sulfate. This product, widely used in shampoos, shower gels, blowing agents, is a dangerous component of skin and hair care products. And as a detergent it is rather weak.
Glycerin, which dries the skin.

Smell

High-quality cosmetics never smells much, that is, it has no pronounced aromas. This is a sign that the product is made with natural ingredients.

Price

What matters is not always the value of the money. Bulk cosmetics is produced in large quantities, so she and the price of a single product is less than that of luxury cosmetics.

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