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If its above 600 pg/mL, functional deficiency is unlikely (though not impossible in rare cases)
The short answer: it depends on how your provider gives it
Heike Stier, Evert Vos, David Kenley
The rationale is that NAD levels decline with age, affecting cellular energy production
These may include: Pain or irritation at the injection site
Your B12 Levels A simple blood test determines your current B12 levels
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