CKD Guaranteed comes from Chong Kun Dang Health, a Korean company whose main business is dietary supplements. That decides everything: its line is skin health from nutrition. It takes ingredients already proven in functional food and brings them to skin, on the reasoning that what supports the body's own functions can support the skin's. Three things are worked on at once, in its own words — the ingredient, the combination that raises its effect, and getting it absorbed. The formulas are hypoallergenic and clinically tested.
