How about the recommendation and use of whitening products.

How about the recommendation and use of whitening products.

Regarding the whitening ingredients for the collagen facial mask, how many days does it take to be effective? Is it related to the skin's metabolic cycle? 

Theoretically, our skin care products, such as the collagen facial mask, can be use it 5 times per week,but you know our skin metabolism cycle is 28-42 days. As long as it is effective for you in one or two months, it is effective. However, there are some strong antioxidant ingredients that can quickly restore part of the "pseudo-melanin", which will reach one or two days. It has a whitening effect, but the melanin particles that have been transmitted to the keratinocytes cannot be changed. 

You can only wait for the entire layer of keratinocytes to metabolize at least 60-70%, even if you cooperate with keratin exfoliation, it will take 2-3 weeks , In order to see the effect visible to the naked eyes.