Ascorbyl glucoside is a combination of Vitamin C and glucose and is a stable form of vitamin c. It degrades to ascorbic acid when properly formulated and absorbed into the skin.
What are the benefits?
The research on ascorbyl glucoside's potential to improve uneven skin tone or spots isn't particularly impressive, especially when compared to more studied forms of vitamin C; however, ascorbyl glucoside combined with Niacinamide is a viable combination to consider, and many skincare products combine these ingredients.
Since Ascorbyl Glucoside is stable, it does not need to be formulated at lower pH which makes it more tolerable by sensitive skin.
Ascorbyl glucoside is a decent source of vitamin C to consider, but as with any ingredient, skin would benefit more from a combination of great ingredients rather than relying on only one and hoping it does everything.