The Oway label reports the dermatologically tested and nickel-tested agricosmetics, ensuring that the nickel concentration remains below the recommended tolerance threshold to avoid any allergic reactions.
The wording Nickel Tested guarantees that for the product concerned the quantity of nickel never exceeds the ceiling of 1 ppm (which is equivalent to 1mg/kg): this quantity does not induce any response in 90% of subjects who are sensitive or allergic to this metal and therefore represents a good safety and reliability indicator.