How long does it take to manufacture a private label scalp serum?

For a stock formula, expect 4 to 8 weeks from purchase order to finished goods. Semi-custom development adds 4 to 6 weeks for formula revision and basic stability review. Fully custom scalp serums take 12 to 20 weeks including development, stability testing, and production. Posting your brief on AJ Cosmo Labs helps you get accurate lead time quotes from multiple vetted manufacturers simultaneously, saving weeks of back-and-forth.