NAD+ before and after: What to realistically expect

Search for NAD+ before and after, and you will find bold promises and dramatic photos. This article takes a different approach. It looks at what has actually been measured in published human studies, what has not, and how to set realistic expectations.

It is educational and not medical advice. Prescription forms of NAD+ are compounded medications, and whether one fits you is a decision for a licensed provider.

What "before and after" can mean for NAD+

For some treatments, before and after is visible. For NAD+, it mostly is not. The most reliable changes researchers have documented are in the levels of NAD+ and related molecules in blood and urine [1, 2, 3].

That is an important distinction. A change in a blood measurement is not the same as a change in how you look or feel. Most marketing blurs that line. This article keeps it clear.

It helps to sort NAD+ claims into three groups:

• Measured in research: levels of NAD+ and related molecules in blood and urine, plus reported side effects [1, 2, 3].
• Reported by individuals: personal impressions, such as how someone feels, which are real experiences but are not controlled comparisons.
• Marketing: before-and-after photos and broad promises, which usually lack a control group or a clear account of what else changed.

Only the first group comes from studies designed to separate the treatment's effect from everything else.

What NAD+ is and what raising it does

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell. A coenzyme is a helper molecule that enzymes need to do their work [4]. NAD+ is not a hormone and not a vitamin, though the body makes it partly from forms of vitamin B3 [4].

Mechanistically, NAD+ has two main jobs [4]:

• Shuttling electrons. It carries electrons in the chemical reactions cells use to process nutrients.
• Fueling signaling enzymes. It is consumed by enzyme families involved in DNA repair and cell signaling, including sirtuins and PARPs.

Research suggests NAD+ levels decline in some tissues with age [4]. That observation is why people are interested in raising them. Whether raising NAD+ levels in people changes health outcomes is a separate question, and the answer so far is limited. For more on this topic, see our article on why NAD+ levels decline with age.

What published studies observed, phase by phase

The timeline below draws only on published human research. One caveat comes first: much of the longer-term data come from oral NAD+ precursors, mainly nicotinamide riboside (NR), not from NAD+ itself. Each phase notes which was studied. Results vary from person to person.

During an infusion (hours). In a small pilot study, eight healthy men received 750 mg of NAD+ by IV over six hours [1]. For at least the first two hours, NAD+ was cleared from the blood so quickly that plasma levels did not rise [1]. By the end of the infusion, plasma NAD+ was significantly higher than at the start [1]. NAD+ and its breakdown products also appeared in the urine [1].

The first two weeks (oral precursor). In a randomized, placebo-controlled trial, adults took NR daily at one of three doses [2]. Within two weeks, whole-blood NAD+ rose by 22%, 51%, and 142%, depending on dose [2]. Adverse events did not differ significantly from placebo [2].

Six weeks (oral precursor). A randomized crossover trial enrolled healthy middle-aged and older adults [3]. Six weeks of daily NR was well tolerated and raised NAD+ levels in blood cells [3].

Longer than a few months. There is very little controlled human data here, for NAD+ itself or for its precursors. A 2026 review of IV NAD+ research found the evidence consists mostly of small, short, often uncontrolled pilot studies [5].

What each phase measured was chemistry in blood or urine. None of these studies was designed to show visible before-and-after changes.

What not to expect

This section is meant to be direct.

• No proven change in how you feel or perform. Published human research does not show that NAD+ treatment improves energy, endurance, strength, or focus.
• No proven effect on aging. Raising NAD+ in blood has not been shown to slow aging or change appearance in people.
• Higher levels are not the same as benefits. A 2023 review of NR trials found that NR reliably raised NAD+ levels [6]. Clear clinical benefits, however, had not been consistently shown [6].

If you see a dramatic NAD+ before and after photo, it is worth asking what else changed. Diet, sleep, exercise, lighting, and other treatments can all play a part. That does not mean NAD+ has no effects. It means the human evidence is still thin, and honest expectations should match it.

How the form you use affects expectations

NAD+ is prescribed in several forms, including injection, nasal spray, and oral drops. The human data are uneven across them:

• IV infusion has the most direct measurements of NAD+ itself, mainly from short pilot studies [1, 5].
• Oral NAD+ precursors such as NR have the most controlled trials, but they are different compounds from NAD+ [2, 3, 6].
• Injection under the skin, nasal spray, and oral NAD+ drops have much less published human data on how much NAD+ reaches the bloodstream.

So expectations built on IV or precursor studies may not carry over directly to other forms. Our guide to NAD+ injection, oral drops, and nasal spray covers how the forms differ.

Safety and quality

Prescription NAD+, whether injection, nasal spray, or oral drops, is a compounded medication. It is not FDA-approved, and the FDA does not evaluate compounded drugs for safety, effectiveness, or quality. Its regulatory footing is also unsettled. FDA reviewers concluded that the evaluation criteria weigh against adding NAD to the list of bulk substances allowed in compounding [7]. That status has not been finalized.

Side effects are also reported. During IV infusions, people have reported nausea, diarrhea, cramping, chest discomfort, and dizziness [8]. In a 2026 real-world review, side effects during infusion were significant enough to set how fast infusions could run [9]. Like any prescription medication, NAD+ carries risks and possible side effects your provider will review with you.

A few questions are worth asking any provider before you start:

• Is the product prepared by a licensed compounding pharmacy, and is it tested for sterility and endotoxins?
• Why this form, rather than another?
• Which side effects should I watch for, and when should I call?
• How will we decide whether to continue, adjust, or stop?

How to track your experience sensibly

You do not need special testing to pay attention to your own experience. A few practical habits help:

• Keep a simple journal. Note sleep, mood, and anything you notice, along with any other changes to your routine.
• Record side effects. Write down what happened, when, and how long it lasted.
• Change one thing at a time when you can, so it is easier to tell what made a difference.
• Bring your notes to check-ins. Your provider can use them to decide whether to continue, adjust, or stop.

Luvo does not run lab tests. If any bloodwork is relevant for you, it is arranged through your own provider or physician.

Common questions

How soon do people notice anything?
There is no reliable timeline. In studies, blood NAD+ levels changed within hours of an infusion and within two weeks of oral precursors [1, 2]. Those studies measured chemistry, not how people felt, so results vary.

Is there a loading phase?
Published human studies do not establish a loading phase for NAD+. Some clinics use one, but that is a protocol choice, not something the research has shown is needed. For what studies and protocols use, see our guide to NAD+ dosing.

What if I feel nothing?
That is a common and reasonable outcome, given what the research shows. Bring it up at your next check-in. Your provider can help you decide whether to continue.

Does it work for everyone?
There is no human data showing NAD+ works for everyone, or reliably for any specific group. Responses vary, and the evidence base is still small [5, 6].

Next steps

If any of this sounds like what you are dealing with, the next step is a conversation with a licensed provider who can review your history and decide whether treatment makes sense for you. Nothing is prescribed or shipped without that review.

Explore Luvo's Longevity Program.