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Consult with a healthcare professional before starting B12 supplements, especially if you have health concerns, have dietary restrictions, take certain medications or are pregnant or breastfeeding." Meshulam adds that even though there is no established upper limit for B12, that if your levels become too high you may experience undesirable symptoms like gastrointestinal distress, weakness and tingling sensations in extremities

Cons: longer visit, higher cost than a shot

This review study highlights the biological effects of different NAD+ boosters as well as the unique benefits of direct NAD+ administration over oral precursors because it bypasses gut and liver metabolism

The initial shots were used to rapidly refill them, prevent further nerve damage, and help heal recent damage