Never run out. The recyclable inner vial slides and twists into the reusable glass bottle of Total RF Serum for an instant refill — no funnel, no mess, no throwing away the outer bottle every time. Read this first: this is a refill, not a starter. It only works if you already own the reusable Total RF Serum glass bottle. If you do not have the bottle yet, buy the full Total RF Serum instead and refill it from here on out. Why refill: it costs less than a full replacement bottle and keeps one glass container in rotation instead of sending a new one to landfill every month. How to use: twist the empty vial out of the glass bottle, slide the new vial in, twist to lock. Apply one pump twice daily, AM and PM. Size: 30 mL / 1 Fl. Oz. U.S. Brand new, sealed packaging 100% authentic Rodan + Fields product Fast U.S. shipping, tracked Limited inventory — these are stocked in small quantities and sell out. Studio DV is an independent reseller of authentic, sealed Rodan + Fields products and is not affiliated with, endorsed by or sponsored by Rodan + Fields. All trademarks belong to their respective owners.