High Propanediol Concentration (95%) in ALA Serum Formulation
Question
I am formulating a serum with 5% Alpha Lipoic Acid (ALA) and noticed a formula using 95% Propanediol. The website states that Propanediol can be used up to 100%, but recommends not exceeding 20% for general use. Is it safe and appropriate to use Propanediol at 95% in this serum formula? What is the reason for using such a high concentration, especially when the general recommendation is much lower?
Answer
Regarding your question about the Alpha Lipoic Acid 5% serum formulation containing 95% Propanediol:
The staff's reply clarifies that Propanediol is not irritating to the skin and can be used at concentrations up to 100%. The recommendation on the website to not exceed 20% is a general guideline provided by the manufacturer for typical applications.
The reason the specific serum uses 95% Propanediol is to ensure that the Alpha Lipoic Acid (ALA) is completely dissolved in the formula, allowing for maximum effectiveness.
While Propanediol at concentrations higher than 20% might cause a feeling of discomfort on the skin, it is not considered harmful or irritating based on the staff's information.
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