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The classic: The serum vitamin B12 blood test If you suspect you have a vitamin B12 deficiency , the first and most common step is a serum vitamin B12 blood test

What makes LR3 unique is its chemical structure: It has an extended amino acid chain (hence "Long") A substitution of arginine at the third position (Arg3), increasing potency Its engineered to resist binding to IGF-binding proteins (IGFBPs), which means more free IGF-1 is available in the bloodstream These modifications result in a half-life of ~2030 hours, compared to native IGF-1s ~2030 minutes making LR3 more stable and effective for performance enhancement

This creates a direct pathway from NAD+ availability to antioxidant defense

Barclay, R