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Eric Verdin, President of the Buck Institute for Research on Aging, has noted, NAD+ is too big to enter cells and is mostly broken down into nicotinamide when injected. IV therapy is expensive ($300800 per session), time-consuming, and lacks the controlled trial evidence that oral precursors have behind them

So you're absolutely right

Those with a B12 deficiency are known to have a lot of fatigue and drowsiness throughout the day

By increasing Schwann cell proliferation, GHK-Cu enhances the cellular infrastructure needed for nerve regrowth

Also, the final decision to inject Neurobion is made by your doctor

Vitamin B2 (Riboflavin) Plays a role in cellular energy production and antioxidant pathways, supporting mitochondrial function and tissue repair