Citric acid is a mild organic acid found in citrus fruits. It is most concentrated in lemons and limes, where it can comprise as much as 8 percent of the dry weight of the fruit.
What Is Citric Acid Used In?
Citric acid is an alpha hydroxy acid used in some personal care products, it can be used to adjust the acidity or promote skin peeling and re-growth in the case of anti-aging products. Many companies used as a natural preservative or along side alternative preservatives. In the bath and body industry it is commonly used in bath bombs or shower steamers.
Bases that contain Citric Acid
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Basic Essentials Shampoo Base

Botanical Facial Cleanser Base

Conditioning Detangling Spray Base

Creamy Milk Bubble Bath Base

Creamy Milk Face & Body Wash Base

Goat's Milk Hand Soap Base

Hydrating Cleansing Conditioner Base

Luxurious Bath & Shower Gel Base

Multi-Function Liquid Glycerin Base

PureEssence Sulfate Free Multi Application Base

Reconstructive Conditioner Base

Suspension Shower Gel Base

Tear Free Shampoo Base
Sources
https://www.sciencedaily.com/terms/citric_acid.htm
https://www.ewg.org/skindeep/ingredient/701385/CITRIC_ACID/