Where to Inject NAD+: Sites, Rotation, Sting

NAD+ Is a Subcutaneous Injection

NAD+ is a subcutaneous (subQ) injection, the same general technique as any other PeRx peptide. The needle enters the fat layer beneath the skin, not muscle, and this is not the IV drip you may have read about in celebrity coverage. The clinic IV and the at-home injection deliver the same molecule by two different routes; the injection is the version you self-administer. If subQ injection is new to you, the full how-to-inject-peptides guide walks through the mechanics step by step, and the main NAD+ guide covers what the molecule does and why levels decline with age. This guide focuses on what is specific to NAD+: where to put it, how to keep it comfortable, and how to rotate a daily injection without wearing out a single site.

The Four Standard Sites

There are four anatomical regions that all subQ injections, including NAD+, can use. Each has slightly different absorption characteristics and ergonomics.

1. Abdomen. The area between the lower rib cage and the hip bones, avoiding a roughly two-inch radius around the navel. This is the default site for most patients. Fat coverage is generally consistent, the area is easy to see, and absorption is reliable. Use the soft tissue on either side of the belly button rather than directly above or below it.

2. Front or outer thigh. The middle portion of the thigh, on the front (anterior) or outer (lateral) side. The fat layer is usually adequate here and the angle is comfortable for self-injection while seated. Avoid the inner thigh, which is more vascular, and stay clear of the immediate area around the knee or hip.

3. Upper outer glute. The upper outer quadrant of the buttock, the same area used for many vaccinations. It is harder to reach for self-injection without a mirror, but the fat coverage tends to be deepest here, which can make it one of the more comfortable sites for a molecule that stings. Some patients rotate this site in once or twice a week to give the abdomen a rest.

4. Back of the deltoid. The fat pad on the back of the upper arm, just behind the deltoid muscle. Fat coverage varies significantly between patients. If you can pinch a half-inch or more of skin and fat here, it works. If the skin pulls tight against muscle, choose a different region. Because NAD+ can sting and this site is often the thinnest, many patients use it least.

Which Site Is Best for NAD+?

There is no evidence that injecting NAD+ in one region produces a different systemic effect than another. Once it enters circulation through the subcutaneous fat, it distributes throughout the body and reaches cells wherever they are. NAD+ is a coenzyme central to mitochondrial energy production and cellular repair, and that machinery is everywhere, not concentrated near an injection site.

Cantó C, Menzies KJ, Auwerx J, "NAD+ metabolism and the control of energy homeostasis: a balancing act between mitochondria and the nucleus," Cell Metabolism, 2015. Canonical review on NAD+ as a central regulator of mitochondrial energy output across tissues. View study

So the choice comes down to comfort and practicality, and for NAD+ that pushes toward sites with a generous fat pad. The abdomen is the practical default: fat coverage is consistent, the angle is easy, the site is simple to see and rotate within, and the cushion of fat tends to blunt the sting. Most patients use the abdomen for the majority of injections and rotate to thigh or glute to spread the wear.

Why NAD+ Stings and How to Stop It

NAD+ has a reputation the other peptides do not. Many patients feel a transient sting, a warm burn, or a brief flushing sensation during the injection. This is commonly reported, it is dose and speed dependent, and it is not a sign that anything is wrong. It usually settles within a minute or two. The IV version is famous for the same feeling at a larger scale, which is why clinic drips are run slowly; the subcutaneous injection follows the same logic on a smaller scale.

The single biggest lever is injection speed. Push slowly, over 20 to 30 seconds rather than a quick few seconds. A fast bolus concentrates the solution in one spot and is the most common reason NAD+ stings sharply. Easing it in gives the tissue time to accommodate the volume.

Use a smaller volume per site. If your prescribed dose comes as a larger volume, ask your provider about splitting it into two smaller injections at two different sites. Lowering the amount deposited at any one spot is one of the most effective ways to keep NAD+ comfortable. Only ever divide the same total dose; never change the amount your provider prescribed.

Let the vial reach room temperature before injecting. NAD+ is stored refrigerated, and cold solution stings more. Take the vial out roughly 15 to 20 minutes before you inject, or gently roll it between your palms. Do not heat it in any other way. Choose a well-cushioned site, and consider a few seconds of firm pressure or a brief ice application to the skin beforehand if the sting still bothers you. Most patients find that speed and volume alone bring it down to a non-issue within the first week.

Rotation Schedule

Repeated injection in the same spot causes minor fat-tissue trauma that accumulates over weeks. The result is small palpable nodules, occasional bruising, or thickened tissue that absorbs the next injection less predictably and often stings more. Because NAD+ is frequently dosed daily rather than a few times a week, rotation discipline matters even more than it does for other peptides.

The rule most providers teach is to move at least one inch, roughly a finger-width, from your last injection point every time. Within a single body region you can subdivide into a grid. The abdomen has roughly eight usable spots if you split it into quadrants on each side of the navel. Cycle through them in order, then move to the next region.

A simple weekly pattern for a five-day schedule: Monday and Tuesday on the right abdomen, Wednesday and Thursday on the left abdomen, Friday on the thigh. Mark the previous spot with a fingernail indent or a small temporary marker if you cannot remember. After a week or two of rotating through the abdomen, give it a rest and lean on the thighs and glutes. If you split each dose across two sites for comfort, count both spots in your rotation so neither gets overused.

A Note on Dosing and Timing

This is a site-and-technique guide, not a dosing guide. Your prescribed dose, frequency, and schedule come from your provider, and NAD+ protocols are typically built around consistent daily use rather than the few-times-a-week cadence common with growth-hormone peptides. Morning injection is often preferred because NAD+ is tied to circadian rhythm, but follow your specific prescription. For the full picture on what NAD+ does, how it compares to IV and oral NMN, and what to expect over the first twelve weeks, see the main NAD+ guide.

Common Pitfalls

Injecting cold, straight from the fridge. This is the most common self-inflicted cause of a sharp NAD+ sting. Let the vial warm up first.

Pushing the plunger fast. A quick bolus is the second most common cause. Slow down to 20 to 30 seconds.

Injecting through clothing. Even thin fabric is a contamination risk. Lift the shirt and inject into clean skin.

Using the same exact spot every day. With a daily injection this catches up fast. Within a couple of weeks you will have a palpable lump and less predictable absorption. Rotate every time.

Injecting into a tattoo, scar, mole, or visible vein. Avoid these sites entirely. Pick clean skin a few inches away.

Reusing the needle. Insulin syringes are single use. A reused needle is dull, which makes injection more painful and increases tissue trauma. PeRx ships ample syringes with each order.

If side effects are what you are weighing before starting, the peptide side effects guide covers what is common, what is rare, and what deserves a call to your provider. For where NAD+ fits alongside other longevity peptides, see the anti-aging peptides guide.

Frequently Asked Questions

Reviewed by Dr. Cory Mellon, MD · Last reviewed July 2026