痘痘肌，大油皮，夏天必须备一瓶~~~而且皮肤会变得细腻透白，not死白。味道也不像大家形容的口水臭，只是没有香味罢了。虽然价格很不可爱，但是效果确实惊艳啊~~~

its expensive, n i got a horrible break out last year

"there is also limited research, produced by Procter & Gamble (the brand behind SK-II) attesting that the Pitera increases the production of hyaluronan – a component found in the skin’s extracellular matrix – in a synthetic skin model. Since hyaluronan synthesis normally slows with age, this is considered to be a unique way to address the problem of aging.

Does Pitera Work in Other Ways as Well?

Another exciting report from Procter & Gamble is that Pitera (Saccharomycopsis Yeast Ferment Filtrate) reduces production of oxidative species.

Yeast fermentation has been shown to increase the activity of components of the skin known as polygalacturonases. One common polygalacturonase in skin care is allantoin, which is normally soothing for the skin. So perhaps Pitera’s soothing properties stem from increased allantoin production.

Use of the Line

From inspection, my favorite product in the line is the SK-II Facial Treatment Essence ($137.99, Amazon.com) which seems to contain the highest concentration of Saccharomycopsis Yeast Ferment Filtrate (Pitera), as well as sodium hyaluronate."

from: https://www.futurederm.com/sk-ii-is-it-worth-all-the-hype-and/