1. Flavors and spices to be avoided: perfume, spices, balsam from Peru, etc. Flavors and fragrances have become the main source of skin allergies caused by more and more cosmetics.

2. Artificial preservatives should be avoided.

4-4 hydroxybenzoic acid, butyl p-hydroxybenzoate, etc.

Extended data:

Damage of preservatives to skin

Injury 1: Accelerated cell aging Under the microscope, scientists added a small amount of preservatives to cultured cells, which flattened the cells, increased protein of extranuclear aging and accelerated cell aging.

Injury 2: Imperfect stratum corneum formation. Scientists have clearly pointed out that preservatives will make epidermal cells immature and loose in structure, making the epidermis thinner and vulnerable to external stimuli; Moreover, abnormal keratinization makes the skin rough and dull, and the defense force decreases.

Injury 3: it will damage cell DNA. Under the microscope, it can be seen that the DNA of cells is damaged, which will make new cells "naturally damaged" and "passed down from generation to generation".

Damage 4: hinder the whitening effect. Skin experts have done experiments on the effect of preservatives on whitening effect, and found that A is an experimental sample of melanin, which does not contain whitening ingredients; B, melanin is obviously lightened after whitening ingredients are added; C adding the same whitening ingredients, and then adding 0. 1% preservative, we can find that the whitening effect is greatly reduced.

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