NAD+ Injections: What the Evidence Says So Far
NAD+ is a coenzyme every cell uses to make energy. Here is what human studies show about raising NAD+, what is known about injections, and why the evidence for energy and aging is still early.
NAD+ injections deliver nicotinamide adenine dinucleotide, a coenzyme your cells use to turn food into energy and to run repair processes. Human research shows that NAD+ levels can be raised, mostly through oral precursors, but studies have not yet shown clear benefits for energy, performance or aging in healthy people. Compounded NAD+ injections are not FDA-approved, and published human data on injected NAD+ are still limited.
Key takeaways
- NAD+ is essential. More than 400 enzymes in the body depend on NAD, according to the NIH Office of Dietary Supplements.
- Your body makes NAD+ from forms of vitamin B3 (niacin) and from the amino acid tryptophan.
- Oral precursors such as nicotinamide riboside have been shown to raise NAD+ in blood cells in small trials and were well tolerated.
- A 2020 systematic review found only a small number of adequately powered trials and called the results promising but still speculative.
- Compounded NAD+ injections are not FDA-approved. A licensed provider decides whether they are appropriate for you.
What NAD+ does
Think of NAD+ as a shuttle. It carries electrons in the chemical reactions that release energy from carbohydrates, fats and protein, helping your cells produce ATP, their main energy currency. NAD+ is also used by enzymes involved in DNA repair, gene regulation and communication inside cells.
Because NAD+ is used up by these repair enzymes, researchers have proposed that keeping levels healthy could support how cells handle stress and aging. Animal studies drove much of the early excitement. The key question now is whether raising NAD+ in people produces benefits you can feel or measure.
Where NAD+ comes from
Your body builds NAD+ from several raw materials:
- Niacin forms (vitamin B3). Nicotinic acid, nicotinamide and nicotinamide riboside.
- Tryptophan. An amino acid found in protein foods.
- Recycling. Cells reuse breakdown products of NAD+ to make it again.
Most people in the United States get enough niacin from food. Poultry, fish, meat, legumes and fortified grains are common sources.
What human studies show
Oral precursors raise NAD+. In a 2018 randomized, placebo-controlled crossover trial, 30 healthy middle-aged and older adults took nicotinamide riboside for six weeks. NAD+ levels in blood cells rose meaningfully compared with placebo, and the supplement was well tolerated. The study was designed to test safety and NAD+ levels, not to prove health benefits.
Benefits are still being worked out. A 2020 systematic review of human trials concluded that, despite decades of research, only a small number of randomized and adequately powered trials had been run. The authors saw promising but speculative signals in a few areas, such as skeletal muscle and the skin condition psoriasis. They called for more trials and noted that NAD-raising treatments should be compared directly with exercise and diet programs, which may be just as effective.
Direct NAD+ delivery is the least studied. A 2019 pilot study measured what happens in the blood during a six-hour intravenous NAD+ infusion. For the first two hours, plasma NAD+ did not rise at all, suggesting the body rapidly clears or breaks down infused NAD+. Levels and breakdown products appeared later in blood and urine. This tells us the body handles injected NAD+ quickly, but it does not tell us whether injections improve energy or health outcomes.
Evidence at a glance
| Approach | What is known | What is not yet known |
|---|---|---|
| Food sources of niacin and tryptophan | Supports normal NAD+ production | Not applicable, this is the baseline |
| Oral precursors (for example nicotinamide riboside) | Raise NAD+ in blood cells; well tolerated in small trials | Whether higher NAD+ improves health, performance or aging |
| Intravenous NAD+ | Infused NAD+ is cleared or broken down quickly at first | Long-term benefits and optimal use |
| Injected NAD+ under the skin or into muscle | Limited published human data | Absorption, benefits and long-term safety |
Safety and what to tell your provider
Because published human data on injected NAD+ are limited, its side effect profile is not well defined. Report anything unusual after an injection, such as redness or discomfort at the site, flushing, nausea, headache or feeling unwell.
Your provider will review your health history and current medications before deciding whether NAD+ is appropriate. Mention pregnancy or breastfeeding, any history of cancer, liver or kidney disease, and every supplement you take, including B3 products.
The RULE NAD+ program uses a compounded injection prepared by a licensed US pharmacy. Compounded medications are not FDA-approved, meaning the FDA has not reviewed them for safety, effectiveness or quality before they reach patients. Your provider sets the dose.
The habits that already raise your energy
Research on NAD+ keeps pointing back to the same basics. Exercise, especially regular endurance and strength work, supports the cellular machinery that NAD+ serves. Steady sleep, enough protein and a diet with whole foods round it out. If you try NAD+, treat it as one tool on top of those foundations, and track how you feel honestly over a few months.
Frequently asked questions
Do NAD+ injections give you more energy?
Some people report feeling more energetic, but controlled studies have not yet shown that NAD+ injections improve energy in healthy adults. Expect an individual experience, not a predictable result.
Are NAD+ injections better than oral supplements?
There is no head-to-head evidence showing injections work better than oral precursors. Oral nicotinamide riboside has the most published human data for raising NAD+ levels. Injections bypass digestion, but early research shows the body processes injected NAD+ quickly.
Is NAD+ FDA-approved?
No. Compounded NAD+ injections are not FDA-approved. A licensed provider decides whether a compounded medication is appropriate for you, and a licensed US pharmacy prepares it.
How long should I try NAD+ before deciding?
There is no established timeline. Many people review how they feel with their provider after a few months. If you notice no difference, that is useful information too.
Talk to a licensed provider
If you are curious about NAD+ for energy, recovery or healthy aging, start a secure online visit. A licensed provider will review your history, talk through what the evidence shows today and decide whether a prescription is appropriate for you.
Sources
- NIH Office of Dietary Supplements, Niacin Fact Sheet for Health Professionals
- Radenkovic D, Reason, Verdin E, Clinical Evidence for Targeting NAD Therapeutically, Pharmaceuticals 2020 (PubMed)
- Grant R et al., A Pilot Study Investigating Changes in the Human Plasma and Urine NAD+ Metabolome During a 6 Hour Intravenous Infusion of NAD+, Front Aging Neurosci 2019 (PMC)
- Martens CR et al., Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults, Nat Commun 2018 (PubMed)
- FDA, Compounding and the FDA: Questions and Answers
Reviewed October 28, 2026.
This article is educational and is not medical advice. Rx programs require an online visit with a licensed provider. Results vary.