Usage of Citric Acid for pH Adjustment in Cosmetics
Question
What is the recommended usage percentage of `Citric Acid (Anhydrous, Natural)` in cosmetic formulations for pH adjustment, and what are the guidelines for its application to achieve a suitable pH for the skin?
Answer
For Citric Acid (Anhydrous, Natural), the usage rate in cosmetics is "as needed" to adjust the pH of the formula. It is crucial to gradually add a small amount, for example, 0.1g at a time, and stir until dissolved. Then, measure the pH and continue adjusting until the desired pH is achieved.
The suitable pH for skin is generally around 5.5-6.5 for products like gels or moisturizers. It is important to avoid adding large amounts of Citric Acid at once, as the pH can change very quickly. The final product pH should not be lower than 3.0.
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