內地對aha濃度上限10%,gel plus至今未批准在內地上市,neostrata aha 產品內地有售 ...
佢應該係跟FDA指引, 家用skincare products AHA level up to 10% at pH 3.5 or above都算安全。
10% glycolic acid at pH 3.5= free acids ~68% x 10%=6.8%
15% glycolic acid at pH 4.1=free acids ~40% x 15%=6%
咁樣計, gel plus其實係低過安全水平。不過佢針對西人市場, AHA %大d, 好似睇上去勁d咁....外國人去醫生度做peel, 閒閒地都做50-70%...爛哂面甩皮好少事