✓N-Core 500 (NAD⁺) powers your cells. S-Core 200 (spermidine) renews them. ✓Two compounds acting on opposite ends of the same autophagy switch. ✓Bypasses digestion — faster and more direct than tablets or powder. Two pillars. One protocol. One purpose. Already own a Pen? Explore the Longevity Protocol Refill Duo.