Difference between Standard and Ultra-Fine Vitamin C Powder for Formulations

Based on the information provided, the difference between ultra-fine Vitamin C and standard Vitamin C is not in quality, but in particle size.

• Particle Size: Ultra-fine Vitamin C has significantly smaller particles than standard Vitamin C.
• Anhydrous Formulations (without water): This is where the particle size difference is most important. In formulas like Vitamin C Anhydrous, where the Vitamin C doesn't truly dissolve but needs to be suspended (e.g., in silicone gels), the ultra-fine powder disperses much better and stays suspended due to its lighter weight. Standard grade would likely settle at the bottom because the particles are heavier.
• Water-Based Formulations: When mixed directly in water, both types will dissolve completely. There is no significant difference in the final solution, although ultra-fine might dissolve slightly faster.
• Substitutability: You can generally substitute standard Vitamin C with ultra-fine in water-based formulas. However, you cannot typically substitute standard Vitamin C for ultra-fine in anhydrous formulas where the small particle size is crucial for dispersion and suspension.