Lactic acid is an organic acid naturally occurring in the human body and fermented foods. It is readily biodegradable and non-toxic to humans and the environment.
In the context of lactic acid in personal care products, it’s an alpha hydroxy acid (AHA) that works to gently exfoliate the surface layer of your skin, sloughing off dead skin cells - leaving it smooth, more evenly toned and refreshed. It has skin softening abilities and is also known to promote collagen production. Compared to other acids commonly used in skincare products like glycolic acid or salicylic acid, it is much more gentle and suitable for sensitive skin.
The lactic acid in Rocky Mountain Soap products is vegan made through the natural fermentation of sugar found in molasses. It has antibacterial properties which works by lowering the pH of the area where it’s applied thus making it an environment that bacteria doesn’t like to grow. As a result it inhibits microbial growth and the spreading of germs. Lactic acid is also a natural preservative and keratolytic agent, which in simple terms just means it helps improve the skin's ability to soak up and retain moisture.