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INGREDIENT DICTIONARY

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Lactic Acid

INCI: Lactic Acid | CAS #: 50-21-5
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Lactic acid is an alpha hydroxy acid used in cosmetic formulations for exfoliation and pH adjustment.

What is Lactic Acid & why is it used?

  • High assay (80.75%) for reliable performance 
  • Very low loss on drying (0.12%) for stability 
  • Low ash (0.25%) indicating purity 
  • Clean heavy metal and microbiological profile 
QUALITY MATTERS

Why specification quality matters

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

Solubility Water soluble
Primary function Buffer / acid
Use level 0.1–10.0%

Behaviour in formulations

It lowers pH and exfoliates by loosening dead skin cells.

Sensory notes

Lactic acid contributes a smooth skin feel over time through exfoliation. At higher levels, it may cause tingling depending on concentration and formulation.

Formulation considerations

PROCESSING

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

COMPATIBILITY

Compatible with most water-based systems. Use caution with pH-sensitive ingredients and always confirm final formulation pH.

pH
Strongly acidic. Final formulation pH must be adjusted and controlled.
FORMULATION EXAMPLES

Toner

  • Lactic acid: 1–3%
  • Humectants
  • Water phase

Exfoliating serum

  • Lactic acid: 5–10%
  • Humectants + soothing agents

Cream

  • Lactic acid: 1–3%
  • Emulsion system

Use level considerations

Recommended range 0.1–10.0%
Suggested starting level 1–3% for most cosmetic formulations%

Typically used at 0.1–10% depending on function.

Formulation summary

A dual-function ingredient used for pH control and exfoliation.

Quality notes

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

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