When people research NAD+ therapy, they typically encounter two delivery methods: IV infusion at a clinic, and subcutaneous injection at home. The active compound is the same. The delivery mechanism — and what that means for effectiveness, convenience, and cost — is different.
Here’s a direct comparison of what each method actually does and which makes sense for different situations.
IV Infusion: High Dose, Rapid Delivery
Intravenous NAD+ goes directly into the bloodstream, bypassing the absorption step entirely. A single IV session typically delivers 250mg to 1,000mg of NAD+ — a substantially higher dose than subcutaneous injection — over a two-to-four-hour infusion.
What this produces: High peak NAD+ concentrations in circulation, rapid uptake by cells, and a more pronounced acute effect than lower-dose methods. People report clearer thinking, a distinct energy shift, and in some cases an intense flushing sensation during the infusion.
The practical limitations: IV infusion requires going to a clinic, committing two to four hours per session, and paying $300 to $800 each time. For an ongoing maintenance protocol, this is expensive and logistically demanding. Most people who use IV NAD+ do so for intensive initial restoration — a series of sessions over several weeks — and then transition to a maintenance approach.
Best for: Rapid NAD+ restoration, significant acute depletion (burnout, recovery from illness, or a demanding life period), or one-time sessions for specific situations. Not the practical choice for ongoing monthly maintenance at most price points.
Subcutaneous Injection: Consistent, Sustained, At-Home
Subcutaneous injection delivers NAD+ into the fatty tissue just below the skin — the same route used for insulin. The molecule is absorbed more slowly than IV delivery and at a lower dose per injection, but the consistent regular schedule means cellular NAD+ levels are maintained rather than spiked.
What this produces: More gradual improvement in energy and cognitive function over two to six weeks, with effects that compound over months of consistent use. The experience is less dramatic than an IV infusion — there’s no acute flush — but the sustained maintenance benefit appears comparable for most long-term users.
The practical advantages: Done at home in under two minutes. Monthly supply shipped to your door through a telehealth provider. Cost of $100 to $250 per month — a fraction of IV clinic therapy. Provider oversight through the telehealth platform allows dose adjustments without clinic visits.
Best for: Ongoing NAD+ maintenance as part of a regular wellness protocol, people combining NAD+ with GLP-1 or other telehealth therapies, and anyone who wants sustained results without the cost or time commitment of in-clinic IV therapy.
Absorption and Bioavailability
IV delivers 100% bioavailability by definition — the molecule enters the bloodstream directly. Subcutaneous injection has high bioavailability but slightly lower than IV, with absorption occurring over hours rather than minutes.
Whether this difference in delivery profile translates to meaningfully different outcomes for long-term users is still being studied. The current evidence suggests that for maintenance purposes, consistent subcutaneous dosing achieves comparable cellular NAD+ levels to periodic high-dose IV therapy — the difference is the path, not the destination.
The Case for Starting With Subcutaneous
For most people exploring NAD+ therapy for energy, metabolic support, and the effects of aging — particularly women combining it with GLP-1 — subcutaneous injection through a telehealth provider is the practical starting point. Here’s why:
The cost is sustainable over months and years, which matters because NAD+ therapy works as an ongoing protocol, not a one-time treatment. The at-home logistics remove the barriers that cause people to miss sessions. The provider oversight means dose can be adjusted based on your actual response. And the monthly commitment is lower than IV, allowing you to evaluate the effect before deciding whether to escalate.
If you start subcutaneous and find you want the acute high-dose experience of IV — for a specific event, a demanding period, or a jumpstart — that option remains available through a local clinic. The two approaches aren’t mutually exclusive.
What I Use
I use subcutaneous injection through ShedRX. My protocol has been consistent for over a year. The effect on afternoon energy and exercise recovery has been meaningful enough that I’ve continued without interruption.
I haven’t done IV infusion. Based on what I’ve read and heard from people who’ve tried both, the acute experience of IV is more pronounced — but for the ongoing role NAD+ plays in my routine, subcutaneous is what I can sustain.
The at-home NAD+ injection program I use is here.
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