Liquid Antiperspirant Formulation

Liquid antiperspirant products typically use aluminum salts as the main active ingredients, such as Aluminum Chlorohydrate or Aluminum Zirconium compounds, which are effective in reducing sweat production.

• Antiperspirant Actives: Use Anti-Sweat™ (Aluminum Chlorohydrate) or Aluminum Zirconium compounds (such as Aluminum Zirconium Trichlorohydrex GLY, Aluminum Zirconium Tetrachlorohydrex GLY, Aluminum Zirconium Pentachlorohydrex GLY, or Aluminum Zirconium Octachlorohydrex GLY), which are water-soluble powders. Aluminum Zirconium compounds are generally more effective than Aluminum Chlorohydrate.
• Solvent: Water is a common solvent for these active ingredients. Alcohol can also be used, especially in anhydrous (water-free) formulations like some roll-ons.
• Formulation Type: For a liquid antiperspirant, common forms include roll-ons or sprays.
  • Water-based: If using a water-based formula, the amount of water should be limited (e.g., not more than twice the proportion of the active ingredient) to ensure a dry feel on the skin. Other fast-evaporating ingredients like alcohol can be included.
  • Anhydrous (Water-free): Anhydrous formulations, often for roll-ons, can be based on alcohol or silicone. The active powder will dissolve and work upon contact with sweat.
• Usage Rate: The recommended usage rate for these antiperspirant actives is typically 5-25%, as specified by the FDA.
• pH: The pH of the final formulation should ideally be in the range of 4-6.
• Other Ingredients: Other ingredients such as Disodium EDTA (0.1-0.2%) can be included. For roll-on formulations, thickeners or gelling agents may be needed to achieve the desired consistency.

When mixing the active powder with water, the liquid may initially appear cloudy but should become clear after about 24 hours.

For odor control, ingredients like DeoMax™ Liquid can be added, although these ingredients primarily focus on reducing odor rather than sweat itself.