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Vitamin B12 has a long history of effective subcutaneous delivery, with little to no muscle pain after B12 injections

Aging reduces NAD+ synthesis pathways while increasing consumption by enzymes like CD38 and PARPs, activated by inflammation and damage.[13][15] CD38, an immune-related enzyme, ramps up with age, breaking down NAD+ precursors

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includes warnings that parenteral thiamine may cause anaphylaxis and that the benzyl alcohol preservative is contraindicated in neonates due to risk of serious reactions)

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