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Always seek medical advice from your doctor before using medicine or expressing health-related worries.

These are much stronger than the standard tablets you might find in a supermarket and come in several forms designed for better uptake

PMID 3374544

This medication is an immune globulin derived from human plasma and is intended for the treatment of immune deficiencies and certain autoimmune conditions

For instance, in one 1960s study of intravenous NAD+ for addiction, patients who received a fast IV drip experienced immediate headache and shortness of breath, whereas those given the same dose at a slower drip rate (under approximately 35 drops/min) had no distress