• Use a clear water-based base with 10% niacinamide and 1% zinc PCA as the target concept
• Control pH and raw-material purity to minimize discoloration and crystallization
• Optimize slip and absorption to avoid sticky afterfeel at a high active load
• Retain the frosted cylindrical bottle, white ribbed dropper, and clinical white-gray label system
• Offer 30 mL and 60 mL size options with matching package proportions
• Consider fragrance-free, oil-free, vegan, and non-comedogenic positioning subject to validation
• Complete stability, compatibility, microbial, irritation, and claim-substantiation testing