VikingMan NAD+ Review: Nine Citations, No Human Trial

1. The real biology, which is genuinely interesting

None of this is pseudoscience at the foundation, and it is worth being fair about that. NAD+ is an essential coenzyme involved in hundreds of reactions, it is required by the sirtuin and PARP enzyme families, and tissue NAD+ levels do appear to fall with age. Restoring NAD+ in aged mice has produced striking results in several laboratories. That is a real and active field, and the reason serious researchers work on it.

The gap is between that biology and the syringe. Human trials in this area have overwhelmingly used oral precursors — nicotinamide riboside and nicotinamide mononucleotide — rather than NAD+ itself. Those trials reliably show one thing: the precursors raise blood NAD+ levels. What they have largely failed to show, in short studies at least, is a corresponding improvement in the things people actually want: energy, cognition, body composition, physical performance. Raising a biomarker is not the same as feeling better, and this field's central difficulty is that the biomarker moves and the person often does not.

There is also a specific mechanistic problem with the marketing premise. VikingMan's argument for injecting is that it delivers the coenzyme directly into your bloodstream, bypassing digestion, so that the full dose reaches your cells. Cells do not readily import intact NAD+. It is a large, charged dinucleotide, and extracellular NAD+ is broken down by enzymes on the cell surface into smaller precursors before anything is taken up. So injected NAD+ very plausibly ends up working as a precursor anyway — which is the thing the oral products were criticised for being. We are not asserting the injections do nothing. We are saying the stated reason they should work better is not as clean as the page implies, and no trial on that page tests it.

2. The claims, one at a time

Pure NAD+ is a Safe & Effective Breakthrough. Safe and effective is the statutory standard a drug must meet to be approved, and this drug is not approved. It is also a claim about long-term safety that nobody is in a position to make, because there are no long-term safety data for repeated subcutaneous NAD+ in healthy people.

Tackles 7 of the 12 causes of aging. The twelve hallmarks framework comes from a 2023 review updating an earlier list of nine; it is a real piece of scholarship. The figure of seven, though, appears nowhere with a source. It is a precise-sounding number attached to nothing, which is a specific rhetorical move worth recognising when you see it.

Promotes healthy brain function & slows down cognitive decline and Decreases chronic fatigue. Cognitive decline and chronic fatigue are medical conditions. A claim to slow or decrease them is a disease-treatment claim, and one sitting a few inches above a line stating the product is not intended to treat any disease. Also on the page: improves clarity, memory & concentration; slows aging & reduces body inflammation; and a benefits list including Immune Support, Weight Loss and Athletic Performance.

The testimonials do the rest of the work. Three appear, attributed only by age and sex — 41 Yr. Old Male, 39 Yr. Old Female, 38 Yr. Old Female — describing waking better, focusing better, and an enormous impact on my life. Under the FTC's Endorsement Guides, testimonials must reflect typical results or the atypicality must be disclosed clearly, and a general disclaimer does not cure a misleading impression. There is no indication of what typical is here, because nobody has measured it.

3. The commercial terms, and a contract pointing at nothing

The good parts first, because they are real. Five dollars for the consultation is genuinely cheap, and refunding it when the provider declines you removes the incentive to approve everybody — which is the failure mode of this entire industry. Not charging for medication until a plan is approved is correct. Letting patients use their own pharmacy, when the alternative is a captive dispensing margin, is unusually open. And being able to move from a monthly subscription to on-demand ordering after the first delivery is a reasonable escape hatch.

The less good parts. The terms state that all service fees are non-refundable and fully accrued once services are provided, and separately that prescription products cannot be returned and all sales are final — normal for medication, but it means a month you dislike is a month you have paid for. Auto-Fill bills your stored card for each refill until you cancel by contacting them, so cancellation runs through a contact route rather than a button. The terms open with a capitalised arbitration notice and class-action waiver.

And a small thing that says a lot. The terms state that products and services are offered in the states identified at vikingman.com/faq. We went to that page. It declines to identify them: it says the list changes, tells you to check back, and explains that once you create an account and enter your zip code they will know your state and contact you when service arrives. So the contractual list of where the service is legally available does not exist, and finding out whether you are eligible requires handing over your details first.

4. Two pages, two different companies

The most useful thing we can tell you is that VikingMan publishes two very different documents about the same product, and the one you will be shown is the worse one.

The affiliate landing page, built on a hosted landing-page platform and still carrying the template's setup instructions in its source, names one side effect: injection-site irritation, treatable with hydrocortisone cream. The FAQ on vikingman.com lists injection-site discomfort, redness, itching and swelling, then nausea, headache, fatigue and dizziness, and adds that people with certain medical conditions, people on certain medications and those pregnant or breastfeeding may not be suitable candidates. It also answers, soberly, that results vary and may take weeks.

The same split runs through the numbers. The main NAD+ page carries no prices and no scarcity counters. The landing page has both, plus the celebrity quotations, plus the review count that does not match. If you are going to engage with this company at all, read the main site's FAQ and safety information rather than the page an advertisement sends you to. That is advice against our own interest, since we are paid $50 when someone converts on the page we are criticising.

What is VikingMan NAD+ and who is it for?

A US men's telehealth service — Viking Man Inc — selling compounded NAD+ as a subcutaneous injection you give yourself one to three times a week, marketed for energy, mental clarity, anti-aging and weight loss. You complete an online questionnaire, pay $5 for a telemedicine visit with a provider licensed in your state, and if prescribed, the medication ships monthly or quarterly. It is aimed at men in their thirties to fifties who feel tired and are drawn to longevity medicine. It is not approved by the FDA for any of this.

What does it cost?

Checked 12 August 2026. The online visit is $5, refunded in full if the provider decides you are not a suitable candidate, and you are only charged for medication after a provider approves a plan — both genuinely good practices. The affiliate landing page advertises $47.99 and starting at $10 per dose, with a banner offering up to 40% off. What you actually pay per month is not published: the FAQ says the cost of treatment depends on the type and amount of medication, which you learn after the consultation. Insurance does not cover it. Shipments are monthly or quarterly, and you can switch to on-demand after the first order.

Is there real evidence NAD+ injections do any of this?

Not for the injections, no. The landing page carries nine numbered citations. We read all of them. They comprise several review articles, two mechanism papers about PARP and SIRT1 enzymes, a paper on NAD+ in COVID-19, a mouse study, and a Time magazine article. There is not one randomised controlled trial of subcutaneous NAD+ in humans among them. The underlying biology is real — NAD+ is an essential coenzyme and its levels do fall with age — but a mechanism is not an outcome, and no citation on that page tests whether injecting it makes anybody feel better.

What about the weight-loss claim specifically?

This is the clearest example of the problem. The page states Helps with metabolism and weight loss and Shown to help with weight loss, both footnoted to reference 6. Reference 6, in the page's own words, is: A key NAD+ intermediate, treats the pathophysiology of diet- and age-induced diabetes in mice. So a weight-loss claim about an injected drug is supported by a mouse study, of a different molecule, about diabetes. The footnote says in mice and the claim says shown to. Those are not compatible.

Why does the page carry a dietary supplement disclaimer?

We do not know, and it is the most puzzling thing on it. At the foot of the page sits the standard supplement formula: the above statements have not been evaluated by the Food and Drug Administration, this product is not intended to diagnose, treat, cure, or prevent any disease. But this is a prescription drug — the same page says Online Prescription Included and compounded and made-to-order by a licensed pharmacy. A prescription drug is by definition intended to treat something, and that disclaimer belongs to a supplement framework that does not apply. It sits a few inches below claims about cognitive decline, chronic fatigue and weight loss. Either the claims are wrong or the disclaimer is.

Does David Sinclair or Joe Rogan endorse this?

No, and the page says so in small print. It quotes a Harvard professor calling NAD+ the closest we have got to a fountain of youth, prints a recognisable unattributed line about getting NAD, and then discloses at the bottom that Dr Conlon, David Sinclair and Joe Rogan do not endorse the claims, views, statements, or products offered by Viking Man. Under the FTC's Endorsement Guides what matters is the impression a page conveys, not a footnote denying it — and a quotation placed beside a Buy button conveys endorsement.

Is the pharmacy FDA approved?

The page says FDA Registered Pharmacy, which is a different and much weaker thing. Registration is an establishment listing obligation; it involves no review of a product's safety, effectiveness or quality, and the FDA does not endorse registered facilities. Compounded drugs are not FDA-approved, are not assessed for efficacy before sale, and NAD+ is not an approved drug for any indication in the United States. If you go ahead, ask which pharmacy compounds it, under what authority, and whether it is an outsourcing facility or a 503A pharmacy.

Are the side effects properly disclosed?

On the main site, largely yes; on the affiliate landing page, no. The landing page names only injection-site irritation and suggests hydrocortisone cream. The vikingman.com FAQ is markedly better: injection-site discomfort, redness, itching and swelling, plus nausea, headache, fatigue and dizziness, and a section saying people with certain conditions, those on some medications, and pregnant or breastfeeding people may be unsuitable. That is a real gap between the page you are advertised and the page that tells you the truth.

I am on a GLP-1 and I feel exhausted. Should I try this?

Speak to your prescriber first, because fatigue on a GLP-1 usually has a findable cause. Eating far less often means too few calories, too little protein, not enough fluid, or a low iron, B12 or vitamin D level — and reduced intake makes all of those more likely, not less. Those are checkable with a blood test and fixable. Adding one to three self-administered injections a week of an unapproved drug on top of a weekly GLP-1, at an undisclosed monthly cost, is not a reasonable first step for a symptom that has ordinary explanations.