Timeline from brief to finished goods is typically 8–16 weeks for a custom retinaldehyde serum in the US. This includes formula development (4–6 weeks), stability and compatibility testing (4–8 weeks accelerated), and production plus fill-and-finish (2–4 weeks). Using a proven white-label retinal base can cut this to 6–10 weeks. AJ Cosmo Labs push notifications alert you immediately when manufacturers respond, keeping your timeline tight.
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