Editing Citric acid (section)

===Cosmetics, pharmaceuticals, dietary supplements, and foods===
Citric acid is used as an [[acidulant]] in creams, gels, and liquids. Used in foods and dietary supplements, it may be classified as a processing aid if it was added for a technical or functional effect (e.g. acidulent, chelator, viscosifier, etc.). If it is still present in insignificant amounts, and the technical or functional effect is no longer present, it may be exempt from labeling <21 CFR §101.100(c)>.

Citric acid is an [[alpha hydroxy acid]] and is an active ingredient in chemical skin peels.<ref>{{Cite journal|last1=Tang|first1=Sheau-Chung|last2=Yang|first2=Jen-Hung|date=2018-04-10|title=Dual Effects of Alpha-Hydroxy Acids on the Skin|journal=Molecules |volume=23|issue=4|page=863|doi=10.3390/molecules23040863|issn=1420-3049|pmc=6017965|pmid=29642579|doi-access=free}}</ref>

Citric acid is commonly used as a buffer to increase the solubility of brown [[heroin]].<ref>{{cite journal |vauthors=Strang J, Keaney F, Butterworth G, Noble A, Best D |title=Different forms of heroin and their relationship to cook-up techniques: data on, and explanation of, use of lemon juice and other acids |journal=Subst Use Misuse |volume=36 |issue=5 |pages=573–88 |date=April 2001 |pmid=11419488 |doi=10.1081/ja-100103561 |s2cid=8516420 }}</ref>

Citric acid is used as one of the active ingredients in the production of facial tissues with antiviral properties.<ref>{{cite news | url = https://money.cnn.com/2004/07/14/news/fortune500/kleenex/ | title = Tissues that fight germs | publisher = CNN | date = July 14, 2004 | access-date =May 8, 2008}}</ref>