COSRX prints a bracketed sub-name under the title on both the bottle and the carton: cent(e)lla and allantoin. The panel behind that pairing is short, and it reads in the order you would expect from a fluid this light. Water leads. Centella asiatica extract follows at a stated 42.4%, a figure the brand publishes on its own key-ingredient slide rather than leaving to the marketing copy.

Sixteen entries is the whole list, and COSRX counts them itself on the back of its product imagery. Red algae extract comes next at 8,100ppm, sugarcane extract at 4,600ppm. Allantoin lands fourteenth. Madecassoside sits fifteenth on a line of its own rather than folded into the extract above it, because one isolated cica compound and a whole-plant extract are not the same material.

Panthenol closes the list. COSRX describes B5 as the ingredient that defines the Hydrium range, but on this particular panel it is sixteenth of sixteen, below madecassoside, and the brand leaves it off its own key-ingredient slide. Its Hydrium stablemate, the green tea gel cream, declares panthenol eighth of twenty-two.

What comes out of the dropper is watery rather than a serum with any body to it. Two or three drops before moisturizer is the brand's own direction, and it adds that the neck, chest and hands can take it too. Nothing across the sixteen is a fragrance, an essential oil or an alcohol.