Why does cosmetic grade nicotinamide cause intolerance?

Common skin problems, such as spots, aging, acne, coarse pores, dark, dry, etc., the use of cosmetic grade nicotinamide can solve a variety of skin problems, improve the skin, to light spots, anti-aging, oil control, pore shrinkage, whitening, moisturizing and other effects. Cosmetic grade nicotinamide in the skin care industry, the effect is more and the application effect is ideal ingredients, can we use cosmetic grade nicotinamide for a long time?

General cosmetics level for most people’s normal use nicotinamide can be use for a long time, but the corneous layer thinner people, do not recommend use for a long time, this is because in cosmetic grade nicotinamide contains impurities, nicotinic acid, nicotinic acid is one reason for the cosmetic grade nicotinamide don’t acid, nicotinic acid can cause skin allergy symptoms such as redness, itching, therefore, It is suggested to pay attention to the content of nicotinic acid when choosing cosmetic grade nicotinamide products.

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