Retinol Serum & Refill Combo

Yes, the formula inside the refill cartridge is identical to the one in the original Night Knight bottle. It contains 2% encapsulated retinol along with peptides, squalane, beta-glucan, and Cica, ensuring the same high-efficacy results without compromising on quality or skin safety.

Using the refill is simple and quick. Unscrew the pump from your used jar by rotating it counter-clockwise, pull out the empty cartridge, remove the seal from the new one, insert it into the jar, and screw the pump back on tightly. This system allows for easy reuse while maintaining product hygiene and effectiveness.

Not at all. The refill cartridge is sealed to preserve the serum’s potency and cleanliness until you're ready to use it. As long as the outer jar and pump are clean and dry, your product remains safe, stable, and just as effective as the original.

Yes, choosing the refill combo significantly reduces plastic waste by allowing you to reuse the outer jar and pump. It’s an environmentally conscious option that supports sustainable skincare habits without compromising on performance.

While the refill cartridge is secure, it’s best to travel with the original pump bottle to prevent any leakage and ensure ease of use. The cartridge is designed more for at-home use as part of a sustainable refill system.

If you're using the Night Knight serum 2-3 times per week, as recommended for retinol beginners and sensitive skin types, the original bottle and refill together can easily last you around 5 to 6 months. Usage may vary depending on how much product is dispensed per application.