| Outcome | Grade | Effect | Studies | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Wrinkles | 
        B
       | 
 | 
 | |||||||
| Skin Smoothness | 
        C
       | 
 | 
 | |||||||
| Skin Thickness | 
        C
       | 
 | 
 | |||||||
| Skin Brightness | 
        E
       | 
 | 
 | |||||||
| Outcome | Grade | Effect | Studies | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Collagen | 
        C
       | 
 | 
 | |||||||
| Elastic Fibres | 
        C
       | 
 | 
 | |||||||