Formulation Feedback

Regarding your powder formulation with Menthol (4%), Aluminium sulphate (76%), and Ricesorb (20%):

Ricesorb Usage

Using Ricesorb at 20% to prevent clumping of Aluminium sulphate is appropriate. Ricesorb, a rice starch derivative, is known for its oil absorption and anti-stickiness properties, making it suitable for powder formulations to improve texture and prevent caking. A usage rate of 20% is within the typical range for powders and should be effective for this purpose.

Need for Preservative

Although your product is a dry powder, the ingredient Ricesorb itself can be susceptible to microbial growth. Additionally, powder products can be exposed to moisture during use or storage, which can lead to contamination. Therefore, it is highly recommended to include a preservative in your formulation to ensure product safety and stability.

Natural Preservative Recommendations

If you prefer a natural preservative, there are several options suitable for cosmetic applications. For a powder formulation, a powder preservative is often the easiest to incorporate.

• Dehydroacetic Acid (Powder): This is available in powder form and is considered a natural preservative. It is effective against bacteria, yeasts, and molds.
• Other natural options include NaturePreserve™ Ultra (contains Gluconolactone & Sodium Benzoate), NaturePreserve™ LB2, PaeoniaPreserve™ (Natural Preservative), and Coco-Preserve™ (Preservative from Coconut Extract). The suitability of these may depend on their physical form and how well they can be incorporated into a dry powder blend.

It is important to check the specific usage rate and compatibility of the chosen preservative with your formulation.