Nov 04, 2019
"Kojic acid" is often criticized. In addition to "safety", another is "sensitization".As for the sensitization of "kojic acid", there are also a lot of reports, so what is the real situation?
Independent research institutions at home and abroad have also done a lot of tests, comparing 1%, 3% of kojic acid solution and SLS (sodium lauryl sulfate, a cleansing ingredient, commonly used in facial cleanser).It is concluded that "kojic acid" is a mild skin irritant.This conclusion does not consider the application of kojic acid in cosmetics, it will add various compounding ingredients to reduce the irritancy of kojic acid.
In the patch test conducted by 220 female patients, there is no evidence that less than 2% of the "kojic acid" product causes contact dermatitis.In terms of phototoxicity, it was confirmed that "kojic acid" was not phototoxic and did not cause delayed contact reaction. Therefore, products containing kojic acid can be used during the day.
These research reports are all research conducted by independent research institutions. There is no direct interest relationship and the credibility is still very high. So why are so many reports of kojic acid allergy?
I don't know from abroad. As far as China is concerned, "kojic acid" used to be the most popular in the field of whitening and freckle removing. Many manufacturers have launched products containing kojic acid.If it is within the limits, mildness is not a problem.However, consumers have pigmentation, and the general mentality is more irritable and needs to be solved quickly.In order to cater to the needs of consumers, many manufacturers have added more than 2% or even more than 4% kojic acid. Excessive concentrations of kojic acid will irritate the skin and cause allergic reactions.Some manufacturers will add hormones to their products to inhibit allergic reactions. But long term use, always have hormone to suppress that day, skin problem begins to erupt, serious can cause facial dermatitis.
Coupled with the ban on Japan in 2003, the negative news of kojic acid began to spread, and most consumers did not understand the truth.A good ingredient is thus killed by consumers and businesses. New whitening ingredients are constantly emerging, and domestic manufacturers are known for their trends. There are very few products that actually use kojic acid.