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INGREDIENT DICTIONARY
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Lactic Acid

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INCI: Lactic Acid / CAS #: 50-21-5

Lactic acid is an alpha hydroxy acid used in cosmetic formulations for exfoliation and pH adjustment.

Key benefits

  • Supports exfoliation
  • Improves skin texture
  • Adjusts pH
  • Enhances product performance

Behaviour in formulations

It lowers pH and exfoliates by loosening dead skin cells.

Add to the water phase with mixing. Always adjust and check final pH after addition.

Use level considerations

Use Rate (Min): 0.1
Use Rate (Max): 10.0

  • pH adjustment: 0.1–1%
  • Daily exfoliation: 1–5%
  • Treatment products: 5–10%

 Use depends on formulation type and desired exfoliation strength.

Starter Use Rate: 1–3% for most cosmetic formulations

Typically used at 0.1–10% depending on function.

Formulation summary

Lactic acid is used both as a pH adjuster and as an active exfoliating ingredient.

 At low levels, it is used to bring formulations into the desired pH range. At higher levels, it functions as an exfoliant, helping to improve skin texture and promote renewal.

It is often combined with humectants to balance its exfoliating effect and improve overall skin comfort.

Quality notes

Cosmetic-grade lactic acid with high assay and low impurity profile, supporting consistent formulation performance. 

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