Hair serum formulation with Cyclomethicone and suggested alternative

Based on the staff's feedback, your original hair serum formula using Cyclomethicone as the base instead of water is not directly feasible because Cyclomethicone requires an emulsifier to mix with the other ingredients.

The staff proposed a revised formula that is workable:

• Glycerin 2%
• Biotin Express 1%
• Vitamin B3 1%
• Zinc PCA 0.2%
• Phenoxyethanol SA 1% (Preservative)
• Silicone Hi-Cond 2-3% (Acts as a hair conditioning agent)
• Rest is a water-based base.

This revised formula uses Silicone Hi-Cond, which is compatible and provides conditioning, and specifies Phenoxyethanol SA as the preservative.