弱有機酸，主要自柑橘類水果取得(特別是檸檬)，為部份食品或飲料的酸味來源，並可作為天然防腐劑。扮演著人體中重要的檸檬酸循環(Citric Acid Cycle) 不可或缺的物質[1]。
2012-05-29
Citric acid is widely used as a pH adjusting agent in creams and gels of all kinds.
In this role it is classified in most jurisdictions as a processing aid and so does not need to be listed on ingredient lists.
Citric acid is an alpha hydroxy acid and used as an active ingredient in chemical peels.
Citric Acid is not devide from Citric fruits like lemon.... It is most from corn.
2015-03-24
檸檬酸屬於果酸的一種，主要作用是加快角質更新，常用於乳液、乳霜、洗髮精、美白用品、抗老化用品、青春痘用品等。角質的更新有助於皮膚的中黑色素的剝落，毛孔的收細，黑頭的溶解等
I have very sun sensitive skin and sunscreens with citric acid make my skin more photosensitive. I avoid it in most of my skincare products.