BHA (Salicylic Acid) Formulations for Clogged Pores: Solubility and Usage in Water-Based Products
คำถาม
I want to make a BHA (Salicylic Acid) product for treating clogged pores. I'm considering mixing Timed Release BHA with water.
Could you please explain the different types of BHA, especially regarding their solubility in water, and how to formulate a simple water-based product like a toner or serum for clogged pores? What are the recommended concentrations and any other important considerations?
คำตอบ
BHA (Salicylic Acid) Formulations for Clogged Pores
BHA, or Salicylic Acid, is a highly effective ingredient for treating clogged pores due to its ability to exfoliate the skin and penetrate oil, helping to dissolve blockages within the pores.
There are various forms of Salicylic Acid available, each with different properties, especially regarding solubility. For simple water-based formulations like toners or serums, a water-soluble form of BHA is necessary.
- Salicylic Acid (BHA) in its standard powder form is not water-soluble and requires a solvent such as Propylene Glycol, Butylene Glycol, or alcohol to be incorporated into a formula.
- Encapsulated Salicylic Acid (Liquid, Timed-Release, Wash-Off) is a water-soluble liquid form that offers a timed-release effect, making it gentler on the skin. However, this specific type is primarily designed for wash-off products like cleansers.
For leave-on treatments mixed with water, other water-soluble forms of Salicylic Acid are generally more suitable. These include types like SalicSoft® (Betaine Salicylate), Complex Salicylic Acid (powder or liquid), Encapsulated Salicylic Acid (liquid or powder for leave-on), and Acacia Salicylic Acid. These forms can be mixed directly into water or water-based formulas.
A typical concentration for Salicylic Acid in leave-on cosmetic products is up to 2% (active Salicylic Acid), as regulated by the FDA. For wash-off products like cleansers, the concentration can be slightly higher, up to 3%. When using encapsulated forms, refer to the product's specific usage rate to achieve the desired active Salicylic Acid concentration.
To create a simple water-based solution for clogged pores using a water-soluble BHA:
- Choose a water-soluble form of Salicylic Acid suitable for leave-on use.
- Determine the desired final concentration (e.g., 1% or 2% active Salicylic Acid).
- Calculate the amount of BHA needed based on its active concentration and the total batch size.
- Mix the BHA directly into the water phase until fully dissolved.
- Adjust the pH of the final solution if necessary, as Salicylic Acid is most effective at a slightly acidic pH (typically around 3-4).
Always start with a lower concentration to assess skin tolerance and gradually increase if needed.
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