Thiodipropionic acid (often shortened to TDPA) is a synthetic organic acid that is used in skincare products as an antioxidant and stabilizing ingredient.
It is generally regarded as safe and non-irritating. There are no scientific studies that mention TDPA having any particular effects on the skin.
Science
1
Diamante, C., et al. (2010). Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics. International journal of toxicology, 29(4 Suppl), 137S–50S.
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