Underarm Cream Formulation with Anti-Sweat™

Regarding your questions about making an underarm cream using Anti-Sweat™ (Aluminum Chlorohydrate) at 20%:

Texture with 20% Anti-Sweat™

Using Anti-Sweat™ at a high concentration like 20% in a cream base requires careful formulation to achieve a non-liquid, quick-absorbing texture. Anti-Sweat™ is a powder ingredient. While it dissolves in water, it is also highly electrolyte-rich. This means that not all cream makers or emulsifiers will be compatible and maintain a stable emulsion. To get a thicker, non-liquid cream texture, you will need to select a cream base or emulsifier system specifically designed to handle high electrolyte concentrations. The overall texture will depend on the entire formula, including the type and amount of emulsifiers, thickeners, and other ingredients used, not just the concentration of Anti-Sweat™.

Need for Preservative

Yes, you absolutely need to add a preservative to your underarm cream formula. Any cosmetic product that contains a water phase is susceptible to microbial growth (bacteria, mold, and yeast). A preservative is essential to protect the product from contamination, ensure its safety, and extend its shelf life.

There are various preservatives available. When choosing one, consider the pH range of your final formula. Anti-Sweat™ formulas typically work best in a pH range of 4-6. You should select a preservative that is effective within this pH range. Examples of suitable preservatives include NaturePreserve™ Ultra, Global Guard™ 221, Mild Preserved™ COS, Preserve-BSB™, and NaturePreserve™ LB2, among others.