Where to Inject NAD+

The Three Primary Injection Sites

At-home NAD+ injections are administered subcutaneously — meaning just beneath the skin, not into muscle or a vein. There are three sites commonly used for subcutaneous self-injection, each with practical advantages depending on your comfort level and body type.

Abdomen

The abdomen is the most commonly recommended site for at-home NAD+ injection. It offers a large surface area, consistent subcutaneous fat layer, and is easy to access without assistance. Inject at least two inches away from the navel, avoiding the area directly around it. Most people find abdominal injections the easiest to self-administer consistently.

Outer Thigh

The outer thigh — specifically the middle third of the front or outer surface — is the second most common site. It's easy to see and access while seated, making it a reliable alternative when rotating away from the abdomen. Avoid the inner thigh and the area directly over the kneecap.

Upper Arm

The back of the upper arm (tricep area) is a usable site but harder to self-administer without assistance, since it requires reaching behind yourself or using a mirror. Most people reserve this site as a third rotation option rather than a primary one.

Why Site Rotation Matters

Repeatedly injecting into the same spot causes lipohypertrophy — a buildup of scar tissue and hardened fat beneath the skin. This isn't just uncomfortable; it also reduces absorption, since NAD+ doesn't absorb as reliably through hardened tissue as it does through healthy subcutaneous fat.

A simple rotation pattern: abdomen left side → abdomen right side → outer thigh left → outer thigh right. Moving systematically through sites gives each area at least a few days to recover before being used again. Your provider will typically give you a specific rotation protocol as part of your treatment plan — follow that over any general guidance.

For more on how dosing frequency affects which sites get used most, see our full dosage and frequency guide.

Step-by-Step: How to Self-Inject NAD+

Your provider will walk you through the injection process specific to your protocol, but here's the general sequence used across most at-home NAD+ programs:

• Wash hands thoroughly with soap and water
• Clean the injection site with an alcohol swab and let it dry completely — injecting while wet increases discomfort
• Draw the prescribed amount into the syringe, removing any air bubbles by tapping and gently pressing the plunger
• Pinch a small fold of skin at the site with your non-dominant hand
• Insert the needle at the angle specified by your provider (typically 45–90 degrees for subcutaneous injection)
• Inject slowly and steadily — rushing increases discomfort and bruising risk
• Withdraw the needle smoothly and apply light pressure with a clean swab; do not rub
• Dispose of the needle immediately in an approved sharps container — never recap or reuse

What to Expect After Injecting

Mild redness, tenderness, or a small raised bump at the injection site is normal and typically resolves within a few hours. Brief stinging during injection is common, especially early in treatment — this usually diminishes significantly after the first few sessions as technique improves and the body adjusts.

If you experience persistent swelling, significant bruising, warmth, or any sign of infection at an injection site, contact your provider. These are uncommon under proper technique but worth monitoring, particularly in the first few weeks.

Wondering what side effects to expect from NAD+ therapy more broadly? See our full benefits and side effects breakdown.

Frequently Asked Questions