Nutrilite's vc was planted on its own farm and picked at the most youthful time of West Indian cherries. At this time, the content of vc is 25 times that of ripe oranges with the same volume, and it is treated within half an hour after picking, retaining its highest nutrition. Moreover, there is something in Nutrilite's vc that is not found in other vc films, that is, plant extract, which contains biological brass, which directly determines the absorption rate of vc you eat in your body.

So I recommend Nutrilite.

As for Yangshengtang, I haven't figured it out yet.