Product Description
A brightening booster serum from Rohto's SKIO line that uses pure vitamin C (ascorbic acid) as its active ingredient. Registered as a quasi drug (医薬部外品) in Japan, meaning the brightening claims have been evaluated and approved by regulators, not just marketing. Designed to be applied right after cleansing as a first step booster, targeting dark spots at the source while also refining pores and smoothing texture. Also contains salicylic acid as a pH adjuster and green tea extract for added antioxidant support. Has a citrus scent. Part of SKIO's minimalist 3 step vitamin C system (serum, lotion, gel), which is Rohto's premium direct to consumer skincare brand.
What's in It
Ascorbic Acid Green Tea Extract
FAQ
Do I apply this before or after toner?
SKIO recommends applying it right after cleansing as a first step booster, before your toner. The idea is that pure vitamin C (ascorbic acid) works best on bare skin at a low pH. If you're worried about irritation, you can apply it after toner instead.
What does 'quasi drug' mean?
In Japan, a quasi drug (医薬部外品) is a regulated category between cosmetics and pharmaceuticals. It means the brightening claims for this product have been evaluated and approved by Japanese regulators, not just marketing. The active ingredient (ascorbic acid) is held to a higher standard than regular cosmetic vitamin C products.
How long should I wait before applying the next product?
Most people wait 1 to 5 minutes to let the vitamin C absorb. If you have time, 5 to 10 minutes gives the low pH formula time to work. If you're in a rush, 1 minute is fine. Just don't layer it immediately with products that have a high pH, like some niacinamide serums, or you'll reduce effectiveness.
