Lotion Formulation Review: High Vitamin C and Emulsifier Concentrations

The lotion formulation you inquired about has ingredients and proportions that warrant consideration. There are some points that need special attention:

1. Vitamin C (L-ascorbic acid) 15%: A concentration of 15% is considered very high for L-ascorbic acid, which is an unstable form of Vitamin C and can easily degrade. Furthermore, such a high concentration can easily cause skin irritation. Generally, using this form of Vitamin C at lower concentrations (e.g., 5-10%) is more common and less likely to cause irritation.
2. Tween 20 10%: Tween 20 is an emulsifier. Using it at a high concentration of 10% is quite a lot for a typical emulsifier and might cause irritation in some individuals. Additionally, using Tween 20 (which is often used in O/W formulations) together with Beeswax (which is often used in W/O formulations or as a thickener) in these proportions might lead to formula instability, separation, or an undesirable texture.

In summary, this formulation contains some ingredients used at higher-than-usual concentrations, which could affect the stability of the product texture and potentially cause skin irritation. It is recommended to consider reducing the concentration of Vitamin C and Tween 20 or to study guidelines for selecting and balancing emulsifiers appropriate for the desired emulsion type.