There are two classes of artificial sweeteners: noncaloric (non-nutritive) and caloric (nutritive).
Non-caloric sweeteners, such as aspartame, acesulfame-K, sucralose, and saccharin, do not raise blood glucose.
Caloric sweeteners, such as sorbitol, mannitol, and xylitol, are sugar alcohols. They have calories and are absorbed into the blood, although more slowly.
Artificial sweeteners are okay for everyone, except that pregnant or breastfeeding women should not use saccharin and people with phenylketonuria should not use aspartame.