Witch Hazel Plus Allantoin: Preservative and pH
Question
I purchased the 200g "Witch Hazel Plus Allantoin" product and plan to mix it with Aloe Vera to use for soothing sunburn.
I have a few questions about the Witch Hazel product:
- Does it already contain a preservative, or do I need to add one? I'm unsure because the description says it can be stored at room temperature.
- Does the pH need to be adjusted? The website states the pH is in the range of 3.8-4.5, but skin pH is typically 5-6.
Answer
Witch Hazel Plus Allantoin: Preservative and pH
Regarding your questions about the "Witch Hazel (Alcohol Free, Paraben Free) Plus Allantoin" product:
Preservative: Yes, the product contains a preservative. According to the product description, it is preserved with Benzoic Acid and is Paraben Free. This is why it can be stored at room temperature.
pH Adjustment: The product has a pH range of 3.8-4.5, as stated on the website. While this product is formulated to be used directly on the skin and is described as non-irritating, the typical pH of healthy skin is around 5-6. When mixing with other ingredients like Aloe Vera, the final pH of your mixture may change. For optimal skin compatibility and to help maintain the skin's natural barrier function, it is generally recommended to adjust the pH of your final cosmetic formulation to be within the skin's natural range (pH 5-6). You would need to test the pH of your mixture after adding Aloe Vera and adjust it if necessary using a suitable pH adjuster.
