To obtain a protective for an oxidative stress caused by excessive active oxygen, to be concrete, a cosmetic, food, health promoting/keeping agent, health food, etc., by making the protective include platinum colloid and palladium colloid.

This protective comprises platinum colloid and palladium colloid in the formulating ratio of platinum colloid to palladium colloid of preferably 3:1 to 1:3, more preferably 2:1 to 1:2, especially preferably about 2:3. The amount of platinum colloid and palladium colloid formulated in the protective, health promoting/keeping agent or health food is preferably ≥20 ppm (2×10-5 g in 1 g of product). In the case of the protective, the protective is in the form of oral administration or coating administration.