How to choose a sunscreen

April 9, 2023
Sunscreen is a summer necessity, every summer, how to choose sunscreen, how to use sunscreen sunscreen effect, it has become a lot of MM entangled problem. So how to use sunscreen scientifically in summer?

Sunscreen used in which step

Ideally, sunscreen should be used after cleansing and before applying makeup, which ensures that it stays close to the skin cells that need protection. Basically, after your daily skin care routine, you can apply sunscreen and then apply your daily makeup. Extensive laboratory experiments have proven that applying just a light layer of sunscreen may not achieve the desired sun protection, and theoretically, the amount for the face should be no less than the size of a dollar coin.

How to apply sunscreen

Sunscreen should be applied to the neck, chest, arms, ears (particularly forgotten and sunburn-prone areas), and any other exposed parts of the body.

How often to reapply sunscreen

Basically, you can do the math like this: 1 SPF lasts 5 minutes, which means an SPF 30 sunscreen lasts 30*5=150 minutes. But you have to remember that this is an estimate in the ideal state, in our daily life we sweat, wipe our face with our hands will affect the sunscreen effect time, so the reapplication time should be shorter than the ideal state. Basically, it is most reasonable to reapply every 2 hours, and you need to reapply indoors by the window as well!

How to reapply sunscreen

It is quite inconvenient to reapply sunscreen after makeup, so how do we protect our skin from UV rays after makeup? First of all, choose a loose powder with SPF index, which contains both titanium dioxide and zinc oxide not only to avoid the embarrassment of makeup but also to make the sunscreen effect more durable. Secondly, cosmetics with SPF, such as foundations, concealers and daily protective creams, can protect your skin from the sun and antioxidants at the same time. But this raises another question: Is the SPF of cosmetics sufficient to achieve the desired protective effect?

Can sun protection in cosmetics achieve the desired effect?

Dr. Jessica Krant, a dermatologist from New York, tells us for sure: "If you use a sufficient amount of cosmetics and lotions with an SPF of more than 30, you can indeed achieve the same effect as sunscreen. But these products must contain both SPF and PA so that they can protect against both UVA (skin-aging causing) and UVB (tanning and sunburn) from the sun. All in all, to be on the safe side, you should still use a separate sunscreen product before applying makeup. If you are not an outdoor worker, using sunscreen lotion followed by a touch-up powder with SPF will already provide daily protection.
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