Glutathione vs NAD+ IV Therapy: Which Should You Try?

Walk into almost any IV therapy clinic in Dublin, Cork or Belfast and you will find glutathione and NAD+ sitting near the top of the menu, often marketed together as complementary options for anyone interested in cellular health, detoxification or anti-ageing support. They are frequently offered as an add-on to one another, which can leave first-time clients unsure whether they need one, the other, or both.

The two infusions are not interchangeable. Glutathione is an antioxidant molecule the body already produces, and IV therapy simply delivers more of it directly into circulation. NAD+ is a coenzyme, a different category of molecule entirely, involved in how every cell in the body converts nutrients into usable energy and repairs DNA damage. They are marketed alongside each other because both fall under the broad umbrella of longevity and wellness IV therapy, not because they do the same job.

This guide compares the two directly: what each one is meant to do, what the human evidence actually shows, how much they cost in Ireland, how the sessions differ, and which one, if either, might suit a particular goal.

Glutathione is often described as the body's master antioxidant. It is a small molecule made from three amino acids, produced naturally in every cell, and it plays a central role in neutralising free radicals and supporting the liver's detoxification pathways. Levels can decline with age, poor diet, chronic stress, alcohol intake and certain illnesses, which is the rationale behind supplementing it intravenously to bypass the digestive system, where oral glutathione is broken down before much of it reaches the bloodstream intact.

Clinically, glutathione IV therapy is most commonly marketed in Ireland for two things: general antioxidant and detoxification support, and skin brightening or pigmentation reduction, an application with a reasonable body of human research, particularly from dermatology studies in Asia, showing measurable reductions in skin pigmentation with repeated glutathione dosing over several weeks. The detoxification and general wellness claims are more mixed. Glutathione genuinely supports the body's own detox pathways at a biochemical level, but the claim that an IV top-up will meaningfully accelerate detoxification in someone with a normally functioning liver is not strongly supported by controlled human trials, and should be treated as plausible rather than established.

Sessions are relatively quick, generally 20 to 45 minutes, and glutathione is usually well tolerated, with occasional mild side effects such as a metallic taste during infusion or slight nausea if given too quickly.

NAD+, or nicotinamide adenine dinucleotide, is a coenzyme present in every cell that is essential to two core processes: converting food into cellular energy through the mitochondria, and repairing damaged DNA through enzymes that depend on NAD+ as a cofactor. NAD+ levels are well documented to decline with age, and this decline has been linked, mostly in animal studies, to reduced mitochondrial efficiency, impaired DNA repair and several markers associated with cellular ageing.

The theory behind NAD+ IV therapy is that restoring youthful NAD+ levels through intravenous infusion could support energy production, cognitive function and cellular repair, and many clients report feeling more alert and energetic during and after a session. The honest evidence position, however, is that the strongest data supporting NAD+'s anti-ageing and cognitive benefits currently comes from cell culture and animal studies, in mice and other model organisms, and that large, long-term human trials confirming meaningful anti-ageing or cognitive benefit from intravenous NAD+ specifically are still not conclusive. Studies of oral NAD+ precursors such as nicotinamide riboside do exist in humans, but those results do not automatically transfer to intravenous NAD+ itself, since the route of administration changes how the substance behaves in the body.

NAD+ sessions take considerably longer than glutathione, typically 90 minutes for lower doses up to several hours for higher ones, since infusing NAD+ too quickly commonly causes uncomfortable side effects including chest tightness, flushing, cramping and nausea, which reputable Irish clinics manage by slowing the infusion rate rather than pushing through discomfort.

Cost is one of the clearest practical differences between the two. Glutathione IV therapy in Ireland typically costs between EUR 100 and 250 per session, depending on the dose and whether it is combined with other nutrients in the same infusion. Many clinics offer package pricing for a course of several sessions, since visible skin-brightening effects generally require repeated dosing over weeks rather than a single visit.

NAD+ therapy sits at a considerably higher price point, generally EUR 250 to 800 per session in Irish clinics, with cost scaling with dose, since higher NAD+ doses require longer infusion times and closer monitoring for the side effects described above. Most providers recommend an initial course of multiple sessions, often weekly for several weeks, before moving to a monthly maintenance schedule, meaning the cumulative cost of an NAD+ programme over two to three months can run into four figures.

For anyone weighing up the two purely on cost, glutathione is the more affordable entry point into IV therapy, while NAD+ represents a more significant financial commitment that is worth approaching with clear expectations about the current state of the evidence, discussed above, rather than assuming the higher price tag reflects proportionally stronger proof of anti-ageing benefit. Prices last checked September 2026 and vary by clinic; always confirm current rates directly before booking.

Both infusions are generally safe when administered by a registered doctor or nurse in a properly equipped clinical setting, but they differ meaningfully in their side-effect profile. Glutathione given orally or topically has a good safety record with limited side effects, but a 2025 narrative review of oral, topical and intravenous glutathione for skin lightening found that the intravenous route specifically carries more serious, if uncommon, risks, including anaphylaxis and liver toxicity, made worse by the lack of standardised dosing protocols across clinics. That does not mean IV glutathione is unsafe when properly administered, but it does mean the intravenous route deserves more caution than the oral or topical forms, and the same review's authors called for larger, more rigorous trials before firm dosing standards can be set.

NAD+ has a more immediately noticeable side-effect profile during the infusion itself. Infusing NAD+ too quickly is well recognised to cause chest tightness, flushing, cramping, headache and nausea, sometimes severe enough that a session needs to be paused. Experienced clinics manage this by starting at a slow drip rate and adjusting based on how the client responds, rather than infusing a fixed dose at a fixed speed regardless of tolerance. Anyone considering NAD+ therapy in Ireland should ask their clinic directly how they manage infusion rate and what happens if side effects occur mid-session, since how a provider handles this is a reasonable proxy for how experienced and well-supervised they are.

Neither treatment is appropriate for everyone. People who are pregnant or breastfeeding, who have certain underlying medical conditions, or who are taking medications that could interact with either substance should discuss this with a doctor before booking, and a responsible Irish clinic will ask about medical history and current medications before your first session, and should be able to explain their dosing protocol for IV glutathione specifically, rather than treating IV therapy as a walk-in, no-questions service.

The right choice depends on what you are actually trying to achieve, since the two treatments are not really competing for the same goal. If your main interest is skin brightening, pigmentation reduction or general antioxidant support, glutathione has the more directly relevant human evidence and comes at a substantially lower cost and time commitment, making it the more proportionate starting point.

If your interest is specifically in cellular energy, mitochondrial support or the broader anti-ageing narrative around NAD+, it is reasonable to try it, but you should go in with calibrated expectations: the subjective energy boost many people report is real and worth something to them personally, but it is not the same as proof of a measurable anti-ageing effect, which the current human evidence does not yet firmly establish. Some clinics do offer combined glutathione-and-NAD+ protocols, on the reasoning that antioxidant support and cellular energy support are complementary goals, though combining the two simply adds their individual costs and time commitments together rather than offering any documented synergistic benefit beyond what each provides separately.

Whichever you choose, treat IV therapy as a complement to, not a substitute for, the fundamentals that most reliably support long-term health: adequate sleep, a reasonably balanced diet, regular physical activity and management of chronic stress. No IV drip, however well marketed, replaces those basics, and a clinic that positions its NAD+ or glutathione protocol as a shortcut around them is overstating what either treatment can genuinely deliver.

Both glutathione and NAD+ IV therapy should be administered in a clinical setting by a doctor or a nurse registered with the Nursing and Midwifery Board of Ireland, with treatments prescribed or overseen by a doctor registered with the Medical Council of Ireland. A responsible clinic will take a health history before your first session, screen for contraindications, and be upfront about the current evidence for whichever treatment you are considering, rather than presenting either as a settled anti-ageing solution.

Pricing transparency is another useful marker of quality. Clinics that publish clear per-session and package pricing, and that explain exactly what is in a given formulation, are generally easier to trust than those that only quote on request or that bundle glutathione and NAD+ together without explaining why. If a clinic cannot explain, in plain terms, what the evidence does and does not support for a treatment it is charging several hundred euro for, that is a reasonable signal to look elsewhere.