# Thiolactic acid

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**Thiolactic acid** is the [organosulfur compound](/source/Organosulfur_compound) with the formula CH3CH(SH)CO2H. The molecule contains both [carboxyl](/source/Carboxyl) and [thiol](/source/Thiol) [functional groups](/source/Functional_group), \sC(\dO)\sOH and \sSH respectively. It is structurally related to [lactic acid](/source/Lactic_acid) by the interchange of [\sSH](/source/Thiol) for [\sOH](/source/Alcohol_(chemistry)). It is a colorless oil.

Thiolactic acid was once widely used in hair [permanent waving formulations](/source/Artificial_hair_integrations), but has been displaced by formulations based on [thioglycolic acid](/source/Thioglycolic_acid). Instead of using the acid itself, its [salts](/source/Salt_(chemistry)) (2-sulfanylpropanoates) are used. It is now mainly used for [depilation](/source/Depilation).[1]

## References

1. T. Clausen (2006). "Hair Preparations". *Ullmann’s Encyclopedia of Industrial Chemistry*. Weinheim: Wiley-VCH. [doi:10.1002/14356007.a12_571.pub2](https://doi.org/10.1002/14356007.a12_571.pub2). ISBN 3527306730.

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