high concentration nipagine

Why is a high concentration of nipagine used in next creme? The usual concentration of nipagine as a preservative is 0.1-0.2% on the water phase. Isn't it "healthier" to lower this concentration or use aqua conservans?
cetyl alcohol 16g, glycerin 20g,olive oil 20g,nipagine 0.5g, na-laurylsulfate 1g, aqua dist. ad 100ml