Combining Niacinamide and Witch Hazel

Based on the properties of Niacinamide and Witch Hazel, combining them in a formulation is generally possible and should not inherently cause crystallization if formulated correctly.

• Niacinamide is a water-soluble powder. It needs to be fully dissolved in the water phase of your formulation. Its optimal pH range for stability is typically between 4.0 and 7.0, although it can be stable in a wider range of 3-8.
• Witch Hazel (distillate) is an aqueous liquid with a naturally acidic pH, usually between 3 and 5.

Since both ingredients are water-soluble and their compatible pH ranges overlap (especially around pH 4-5), they can be combined. Crystallization of Niacinamide is unlikely if it is properly dissolved initially and the final pH of the formulation is maintained within the acceptable range for Niacinamide stability (ideally 4-7). Ensure Niacinamide is completely dissolved in the water phase before adding other ingredients like Witch Hazel, which is typically added in the final step at a temperature below 40°C.

Therefore, if the formulation is prepared correctly, you should not encounter crystallization issues when combining these two ingredients.