B Complex vs. B12: Which Is Best? Vital Flow Infusions Staying healthy this time of year starts at the cellular level, and B12 plays a major role., Vitamin B12 supports energy production, nervous system function, red blood cell formation, and immune NAD+ vs. B12: What's the difference? NAD+ supports cellular energy, metabolism, and longevity at the mitochondrial level. B12 helps with red blood cell production, nerve health, and energyespecially if you're deficient. B12 vs Lipo B12 Injections Invigor Medical