1,One of the most useful humectants which can improve water in skin in moisture is glycerin甘油(more higher on ingredients list more filler in the product).

2,Sun exposure is the key cause of wrinkles(UVB rays cause burning,UVA rays cause skin ageing,SPF counteract the UVB).

UVA rays have longer wavelength can penetrate glass.

3,A prescription-strength product like tretinoin can improve fine lines,retinols维A and peptides肽类 also work.

4,Packing and science have effect on sales.

5,Dry brushing is the most effective treatment for cellulite.

6,Self-discrepancy theory proposes that we feel a drive to reduce gap between actual self and ideal self when they’re different.

美容的真相分别从皮肤，美妆，外形（脂肪团）和他人评判来揭示让一个人更好看的原因，得出部分科学论证，实验样本数量太小存疑。