Why is testing scope weighted higher than price?

Because the only documented harm in this market came from material that was correctly identified and adequately pure, and made to a food standard. Purity and identity assays cannot detect the problem FDA described. Price can only sensibly break ties between suppliers that have cleared the testing question.

Is two laboratories per batch actually better than one?

Meaningfully, yes. Two independent documents on the same lot mean a single laboratory relationship is not the only thing standing behind the claim. It still does not substitute for an assay neither of them ran.

What score would an endotoxin result be worth?

Fourteen points on this weighting, taking the top entry from 79 to 93. No supplier we have looked at in this market publishes one, which is why nothing here scores in the nineties.

Should I just use a clinic instead and skip vendor selection?

A clinic moves the same question somewhere you can see it less. The material still came from somewhere, and FDA's notice was written about compounders and the repackagers supplying them. [Where to buy NAD+](/nad/where-to-buy-nad/) compares the channels.

Does a higher price signal better material?

No. Price in this market tracks positioning and margin, not manufacturing standard. The measurable things are the ones on the certificate, and those are cheap to check.

Best NAD+ Source: Testing Scope Decides, Price Breaks Ties

Summary: A ranking is only worth reading if the rule came first, so the weighting is published before anything is scored. Testing scope carries the most weight because of what FDA said about food-grade NAD+, and the source we link loses points on exactly that criterion.

This content is for informational purposes only and is not medical advice. Always consult a qualified healthcare provider before starting, changing, or stopping any medication.

Best NAD+ source is a question nobody licenses an answer to, so the only honest way to answer it is to publish the rule first and let you disagree with the rule rather than with our taste. The weighting below was written before anything was scored, and the source we link does not get full marks.

The entry being scored is here, so you can open its documents alongside the workings.

Where readers actually buy it

Ascension Peptides — NAD+

Research-grade NAD+, tested by two outside labs and shipped from the US. The code below takes half off the vial.

Code at checkoutPEPTIDEDECK50% off

NAD+ · 1,000 mg$104.00$52.00$5.20 per 100 mgGet the 1,000 mg →

Quoted per 100 mg because NAD+ is dosed in hundreds of milligrams, not the single milligrams a peptide vial holds. Buying 3, 5 or 10 takes 3%, 5% or 10% off the list price. Free shipping starts at $250.

Batch certificates from two independent labs
Free shipping over $250
Ships same day if ordered before 2pm CST

Sold for laboratory research only and not for human consumption. These are affiliate links: we may earn a commission at no cost to you, and it does not change what we recommend. Prices checked August 20, 2026.

Best means something weaker here than it does upstairs on this site

When this site compares Zepbound against Wegovy, best has real content. Two approved products, two sets of randomized endpoints, two labels listing adverse events, two prices you can look up. That comparison is done properly in our guide to choosing between GLP-1 medications.

NAD+ offers none of that scaffolding. It is nicotinamide adenine dinucleotide, a coenzyme your cells already make and spend, not a peptide and not an incretin, with no approved injectable product and no efficacy trial standing behind how it is marketed. There is no clinically better NAD+ and no clinically worse NAD+, because nobody has compared versions of it in people.

So best NAD+ source can only mean the supplier whose claims survive checking. That is a supply chain question, and unlike the medical one it is actually answerable.

The weighting, published before the result

Criterion	Weight	What it measures	Why it sits where it does
Testing scope	40	Identity, purity, lot matching, named laboratories, and whether anyone ran an endotoxin assay	FDA's 2024 notice makes this the criterion with a body count attached
Price transparency	25	Whether list, discounted and per unit figures are all visible before checkout, with quantity mechanics stated	Hidden arithmetic is how this market manipulates comparisons
Dispatch and domestic stock	20	Published cutoff, real domestic inventory, transit time measured in days	Transit time is a material handling question here, not a convenience one
Written recourse	15	Whether the refund, damage and shipping terms are readable before you pay, and what they actually say	A policy you can only discover after a problem is not a policy

Testing scope carries nearly half the total for one reason. In a notice whose content is current as of 30 October 2024, FDA said it was aware of compounders using food-grade nicotinamide adenine dinucleotide sold by repackagers to make intravenous products, warned that food-grade ingredients "are not suitable for compounding sterile drugs without appropriate processing, due to the high risk of contamination with microbes and endotoxins", and reported adverse event reports following use of NAD+ injectable drugs including severe chills, shaking, vomiting and fatigue, some requiring medical treatment, consistent with excessive endotoxin levels ^[1].

Purity assays do not detect endotoxins. Identity assays do not detect endotoxins. Endotoxin testing is its own discipline with its own FDA guidance ^[2], and it is the least published number in this market. Any weighting that does not put it first is not taking the only documented harm seriously.

Price sits second rather than first deliberately. A low figure from a supplier that fails the testing criterion is not a bargain, it is an unknown sold cheaply.

Best NAD+ source: how the categories score

Categories rather than invented brand names, because we can only name and score what we have actually opened.

Category	Score	What earns it	What loses it
US research supplier publishing lot-matched certificates from two named labs	79	Two independent laboratories per batch, purity and identity both documented, an unusual published quantification, transparent per 100 mg pricing, same day domestic dispatch	No endotoxin result on the published certificates, and restrictive written terms
US supplier publishing one lab per batch	62	Real lot-matched documentation, genuine domestic stock, readable policies	Single point of verification, usually a higher figure per 100 mg, endotoxin still absent
US storefront publishing a site-wide certificate only	34	Fast checkout, a real company, domestic shipping	No document ties to the vial you receive, which is the whole point of a certificate
Overseas direct seller or marketplace	21	Lowest headline price	Multi-week transit on material with cold storage guidance, customs exposure on the buyer, certificates rarely matched to your lot, no practical recourse
Clinic or med spa selling infusions as the product	Not scored	Trained administration, which is real and worth something	You are buying a service, not a material you can inspect. The supply chain is invisible to you and it is the one FDA wrote about
Forum or social seller	Not scored	Nothing	No company, no certificate, no address, no reversible payment

The top category has one entry we can name from documents we have read, which is the listing on this page. Here is the arithmetic behind its 79.

Testing scope, 26 of 40. Two independent laboratories publish batch certificates: Kovera Labs on lot 25-05260628 and MZ Biolabs on lot 25-01260229. The MZ Biolabs document gives purity by HPLC-UV at 99.66% with the peak list printed, identity confirmed by HPLC-MS, and a quantification by HPLC-UV measuring 784.32 mg per vial against a 1,000 mg label, with the laboratory's own note that salts and buffers added for solubility are not detected by UV and are not counted as impurities. Two named labs, lot-specific, with a printed quantity is above what most of this market publishes. The missing fourteen points are the bacterial endotoxins line, which is not on the document.

Price transparency, 25 of 25. List $104.00, code price $52.00 with PEPTIDEDECK, quantity tiers of 3, 5 and 10 units at 3%, 5% and 10% off list, free shipping from $250, all visible on the page before checkout. On the label figure that is $5.20 per 100 mg. On the certificate's measured 784.32 mg it is about $6.63 per 100 mg, which is the number we would carry into any comparison. Whether the code stacks with the tiers is not documented anywhere, so do not assume it does. Full workings sit on NAD+ price.

Dispatch and domestic stock, 20 of 20. Published 2pm CST cutoff Monday to Saturday for same business day shipping, from US stock. Given that the supplier's own storage guidance is minus 20 C for the sealed vial, days of transit rather than weeks is the substantive point.

Written recourse, 8 of 15. The terms are published and readable before you pay, which is most of what this criterion asks. What they say is restrictive: all sales final with no returns, exchanges or refunds as the default, damaged or incorrect orders reported within 24 hours of delivery or not at all, transit damage on the buyer unless Route protection was added at checkout, and a chargeback clause that reserves the right to pursue costs. Full marks for publishing it. Points off for what is in it, and a practical instruction that follows from it: inspect and photograph on the day the box arrives, not the week after.

Where the ranking is honest about us

We link this supplier as an affiliate and earn a commission if you buy through the card above. That is disclosed there, in our disclaimer, and here, because FTC's endorsement guidance is clear that a material connection has to be disclosed where the recommendation is ^[3].

The reason the scoring is done this way is that a disclosure alone does not make a recommendation trustworthy. Publishing the rule first does, because you can check whether we bent it. We did not give the top entry full marks on the criterion that carries the most weight, and the number it lost is the one you should be asking your own supplier about, this one included.

Best NAD+ vendor, best place to buy NAD+, and the other phrasings

They are the same search. Best NAD+ vendor, best source for NAD+ and best place to buy NAD+ return the same storefronts and the same absence of any licensing body, because there is no accreditation to hold in this market. What changes between them is nothing, which is worth knowing before you run all four and treat the overlap as consensus.

Vendor selection also does not change the regulatory picture. NAD sits in Category 1 of FDA's interim 503A policy, "Bulk Drug Substances Under Evaluation", on the list updated May 14, 2026, which means FDA does not intend to act against a compounder using it provided the guidance conditions are met ^[4]. That is non-enforcement pending evaluation, not approval, and it applies to compounding pharmacies rather than to research storefronts. Our NAD+ without prescription page handles it properly.

Questions about picking a supplier

Why is testing scope weighted higher than price?: Because the only documented harm in this market came from material that was correctly identified and adequately pure, and made to a food standard. Purity and identity assays cannot detect the problem FDA described. Price can only sensibly break ties between suppliers that have cleared the testing question.
Is two laboratories per batch actually better than one?: Meaningfully, yes. Two independent documents on the same lot mean a single laboratory relationship is not the only thing standing behind the claim. It still does not substitute for an assay neither of them ran.
What score would an endotoxin result be worth?: Fourteen points on this weighting, taking the top entry from 79 to 93. No supplier we have looked at in this market publishes one, which is why nothing here scores in the nineties.
Should I just use a clinic instead and skip vendor selection?: A clinic moves the same question somewhere you can see it less. The material still came from somewhere, and FDA's notice was written about compounders and the repackagers supplying them. [Where to buy NAD+](/nad/where-to-buy-nad/) compares the channels.
Does a higher price signal better material?: No. Price in this market tracks positioning and margin, not manufacturing standard. The measurable things are the ones on the certificate, and those are cheap to check.

Best NAD+ source, on this weighting, is a US supplier publishing lot-matched certificates from two named laboratories, and it scores 79 rather than 95 because nobody in this market publishes the number that matters most. If you would rather work criterion by criterion than score by score, NAD+ where to buy sets out the checklist, and NAD+ for sale reads a listing field by field.