We have compiled frequently asked questions about Shiny C Serum.

If you have any additional questions, please feel free to contact us through the Contact Us page.

■What is APPS?

APPS stands for Trisodium Ascorbyl Palmitate Phosphate.

It is an amphiphilic vitamin C derivative that combines the properties of both water-soluble and fat-soluble types. Known as an “advanced vitamin C derivative,” APPS is a highly regarded cosmetic ingredient.

Compared to conventional vitamin C derivatives, APPS is gentle on the skin and offers high penetration, making it highly effective in delivering visible results.

■What is TPNa?

TPNa stands for Tocopheryl Phosphate Sodium.

It is an amphiphilic vitamin E derivative that combines both water-soluble and fat-soluble properties. Known as a “stable vitamin E derivative,” TPNa is a highly regarded cosmetic ingredient.

TPNa is easily absorbed by the skin and quickly penetrates deep into the stratum corneum, helping to improve various skin concerns and enhance overall skin health.

■What is the concentration of the ingredients?
The concentration of the ingredients is not disclosed.

Additionally, a “high concentration” does not necessarily guarantee better results.

The key lies in the optimal ratio of ingredients and the precise formulation method.

■How long does one bottle last?

Each bottle contains 100mL of product.

When used twice a day (morning and night), it typically lasts about 1.5 to 2 months.

■Can I use it in the morning?

Yes, the APPS in the formula blends easily with the skin and helps regulate sebum production.

This can prevent makeup from breaking down due to excess sebum during the day.

If you experience dryness or feel a lack of moisture, we recommend using it 2 to 3 times a day, especially during dry seasons.

■Can I use it with other skincare products?

Yes, it can be used alongside other serums or creams without any issues.

However, if you experience any discomfort or feel that it does not suit your skin, we recommend avoiding combined use.

■What is the expiration date?

After opening, store it in the refrigerator and use it within 2 months.

If you notice any yellow discoloration or sediment at the bottom, please discontinue use.

■Why should it be refrigerated after opening?

Due to the characteristics of APPS (Trisodium Ascorbyl Palmitate Phosphate), oxidation progresses after opening.

This can result in crystallization, yellowish cloudiness, a fermented yogurt-like smell, or sediment forming at the bottom of the bottle.

To maintain its high quality and ensure optimal effectiveness, please refrigerate the product after opening.

*During warmer months (June to September), we recommend storing it in the refrigerator even if unopened.
**If stored in a location below 30°C, it can remain at room temperature for a few days without issue, making it suitable for travel and on-the-go use.

■Can men use it?

Yes, men can use it without any issues.

It is especially popular among those with oily or acne-prone skin.

The beauty pharmacist (male) managing this site also uses it as part of his daily skincare routine, applying it twice a day.