High-concentration spermidine, delivered daily from the Longevity Pen®. ✓200 mg of high-concentration spermidine in a 2.5 mL cartridge — a daily micro-dose of 8–9.6 mg. ✓No fillers or bulking agents — a proprietary form engineered to stay stable at high concentration. ✓Trehalose-stabilised and filled under inert gas — manufactured in Europe to GMP-grade standards. ✓Engineered exclusively for the Longevity Pen® — precise daily delivery and optimal bioavailability. The second pillar of longevity. Built to run alongside N-Core 500 (NAD⁺).