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Please tell me in which order to use your products.

Please proceed in the following order.
① Cleansing & Wash
② Essence Lotion NS
③ Beauty Serum
④ Whitening Emulsion
⑤ UV Emulsion (only during daytime)
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I wish to know how to take care of blemishes

As final skincare of the whole skin, put the Whitening Emulsion gently on the areas of concern. The medicinal whitening Tranexamic acid effectively deals with blemishes and freckles.
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If I use it with other companies' cosmetics
would it be fine?

Yes, it is fine. Use beauty serums/oils in order by starting with those of a thin and clear texture.
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I have wrinkles and smile lines,
it is concerning.

The Proteoglycan contained in the Beauty Serum, is effective against wrinkles from dryness and helps the skin be firm and radiant, so apply 1 to 2 pumps of th serum on the areas of concern morning and night.
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What does efficacy-tested mean?

It means "passed the test evaluation of the effictiveness on wrinkles" prepared by the Japanese Cosmetic Science Society, and refers to products certified to "make fine lines from dryness less noticeable".
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What is a quasi-pharmaceutical product?

It refers to products in the category between pharmaceuticals and cosmetics, containing a fixed concentration of active substances with efficacy approved by the Ministry of Health, Labour and Welfare.