NAD+ Dosage Guide, Benefits & Side Effects

NAD+ is typically supplied as a lyophilized (freeze-dried) powder that is reconstituted with bacteriostatic water before use. Unreconstituted powder is generally stored frozen (around -20°C, ideally colder for long-term storage), kept dry and away from light. Once reconstituted, NAD+ is chemically unstable in solution and degrades relatively quickly at room temperature (a large fraction can degrade within about 48 hours), so it should be refrigerated at 2-8°C, protected from light, used within roughly 1-2 weeks, and not subjected to repeated freeze-thaw cycles.

Direct oral NAD+ has very poor bioavailability because the molecule is broken down by stomach acid and first-pass liver metabolism before it can reach circulation intact. Injection (subcutaneous, intramuscular) or IV infusion bypasses the gut entirely and is reported to raise blood NAD+ levels more directly and quickly than oral routes. Oral precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) are absorbed better than NAD+ itself and are converted into NAD+ enzymatically in the body, but this conversion is a slower, less direct path than injection.

It is commonly combined in research and clinical-adjacent protocols with peptides such as BPC-157, thymosin beta-4, growth hormone secretagogues, and with GLP-1 agonists like semaglutide, on the reasoning that NAD+ supports the cellular energy (ATP) needed for tissue repair and offsets fatigue sometimes reported during GLP-1 therapy. There is limited controlled research directly testing these combinations, so claims about added benefit are largely anecdotal or mechanistic rather than clinically proven.

NAD+ itself (as nicotinamide adenine dinucleotide) is a naturally occurring molecule in food and the body, and related precursors are sold as dietary supplements. However, injectable NAD+ products marketed by research-chemical suppliers are typically labeled 'for research use only, not for human consumption,' meaning they have not been evaluated or approved by regulators (e.g., the FDA) as a safe or effective drug for any medical use. IV NAD+ therapy is offered at some wellness clinics under medical supervision, but this differs from unsupervised self-administration of research-grade material.