想来想去，你还太年轻，没什么太急得需要，可以考虑以下几个。说明是从他们的网站copy来得。

Continuously speeds skin's own shedding cycle so lazy, dulling cells don't clutter skin's surface.
Instantly creates an overall even tone.

This exclusive complex of multi-hydroxy acids retextures skin to dramatically improve
smoothness, clarity and radiance--in just one day.

When other skin care treatments do not seem to be enough, this lightweight, comfortable,
double-formula serum quenches the thirst of very dehydrated skin. The long-lasting results
restore freshness and suppleness.

问题是你要什么样的精华素啊？这个年龄，没什么问题，就最好不用太多东西。

到目前为止，你要的还没有上市。商家一般都是把anti aging 和hydrating分开的。
你就多买几个吧。另外，essence or serum没有保湿能力强的，都是要加moisturizer的，
不然就不叫精华素了。

The one of Clarins in my upper post, is a very good hydrating essence.
You may like to try($48.5). The other hydrating one is Chanel, but a little bit
expensive($55).

Do buy the Biotherm's source therapy, it is not good at all, not hydrating
and moisturizing as the ad boasted.