Retinol is as close as it gets to a do-it-all topical skin care ingredient ; dermatologists love its ability to boost skin cell turnover and spur the production of collagen (collagen being the fiber in skin that keeps it firm and smooth). Plus, it has ample data to back up its efficacy. But retinal, which belongs to a group of ingredients called retinoids (that also includes retinol), might be able to surpass it. Short for retinaldehyde, retinal is even more powerful than retinol, with the