NAD+ injections vs. oral NAD+ supplements

What NAD+ is and why people want more

NAD+ is a coenzyme found in every cell, essential for turning food into usable energy and for many repair processes. It's the main active form of vitamin B3 (niacin) in the body. Research suggests NAD+ levels decline with age in some tissues, which has made it a focus of longevity research and marketing.

The open question is whether raising NAD+ in adults actually improves how they feel, function or age. That hasn't been demonstrated in large human trials for either injections or supplements.

Why most supplements use precursors

NAD+ is a fairly large molecule that doesn't survive digestion well, so most oral products provide smaller building blocks. Nicotinamide riboside, nicotinamide mononucleotide, nicotinamide and nicotinic acid can each be converted into NAD+ through the body's own pathways.

The best-known human trial is a 2018 randomized, placebo-controlled crossover study in 30 healthy adults aged 55 to 79. Six weeks of NR was well tolerated and raised NAD+ in blood cells by about 60%. However, it didn't show clear improvements in metabolic measures, exercise capacity or motor function, and suggested blood pressure benefits were exploratory. In other words, NR can raise the number, but the payoff is still unproven.

What an NAD+ injection involves

An NAD+ injection puts NAD+ directly under the skin, so it doesn't depend on digestion or conversion. At HealifyMD, it's a compounded medication you self-inject at home on a schedule your clinician sets, with follow-up to see how you're tolerating it.

Human research on injected NAD+ is limited to small studies, and we don't know whether delivering NAD+ this way leads to better outcomes than precursors. People commonly report injection-site discomfort, flushing or nausea.

How they're regulated

There is no FDA-approved NAD+ injection. Compounded NAD+ is prepared by a licensed pharmacy for an individual prescription; compounded drugs are not FDA-approved, and the FDA doesn't verify their safety, effectiveness or quality before they're sold.

NR and NMN are sold as dietary supplements. Supplement makers are responsible for their products' safety and labeling, and the FDA doesn't approve supplements before they reach the market, so product quality and actual content can vary between brands. Niacin itself is both a vitamin and a prescription drug at higher doses, and high-dose nicotinic acid commonly causes skin flushing.

Practical differences

• Routine: supplements are a daily capsule; injections need a short home self-injection on a set schedule
• Supervision: injections at HealifyMD come with a clinician review; supplements usually involve none unless you tell your doctor
• Cost: NAD+ Injection starts at $199 per month at HealifyMD ($166 per month on the 3-month option); supplement prices are set by retailers and vary widely
• Who shouldn't use them: neither is used during pregnancy or breastfeeding without medical advice

Questions to ask before choosing either

Because neither option has proven outcomes, it helps to decide in advance how you'll judge whether it's worth continuing. Pick one or two concrete things you hope will change, such as afternoon energy or recovery after exercise, and set a review date with your clinician, typically after about three months.

If you choose a supplement, look for a product tested by an independent third party, since supplement content isn't verified by the FDA before sale. If you choose an injection, ask how it's supplied, how to store it, what side effects to report, and what happens if you decide to stop. Either way, keep a simple log so the review is based on more than memory.

Which might fit you

Because the evidence for both is early, this is mostly a question of preference, budget and how much oversight you want. Your clinician can help you weigh it.

• You want to try raising NAD+ at the lowest cost and without needles: an NR supplement has the most human data on raising levels, though benefits are unproven
• You'd like clinician oversight and are comfortable with self-injection: an NAD+ injection with a defined review point may suit you
• You're mainly tired: ask first about sleep, thyroid, iron, vitamin D, hormones and medications, which are better-established causes of fatigue
• You take other supplements or medicines: tell your clinician, since niacin-based products have their own effects