Bioavailability before the label
Don't just ask how many mg are on the label, but how much actually becomes available NAD+. Oral intake loses a large and hard-to-predict share; a controlled form makes the amount known.
Comparison: pen vs capsules
NAD+ pen or NAD+ capsules - which is best?
Searching for the best NAD+ or trying to choose between a NAD+ pen and capsules? This page compares the two formats honestly - where the pen wins, where capsules are genuinely more convenient, and how to evaluate a NAD+ supplement before you order.
Last reviewed
The core of the question
Why format decides how much NAD+ actually reaches the cell.
NAD+ is a large, charged molecule that is broken down in the gastrointestinal tract and poorly absorbed orally. Oral NAD+ capsules therefore usually rely on precursors - NMN or NR - that must be converted across several steps and pass the liver's first-pass metabolism before the pool is affected. The role of NAD+ metabolism and the decline of the pool with age is summarised in the review in Nature Reviews Molecular Cell Biology (Covarrubias et al., 2021). The result: oral intake delivers a limited and hard-to-predict amount compared with the dose you start with.
A pre-filled research pen bypasses this. You work with a known amount of NAD+ in a controlled form, without reconstitution, dose calculation, or guesswork about how much is actually converted. For research work where the dose must be reproducible, the difference is decisive.
The potent route
Known dose in, known dose studied.
Pens arrive pre-filled, stability-tested and with batch documentation. You start with a defined amount of NAD+ instead of an oral form whose uptake varies between individuals and occasions.
NAD+ pen vs capsules
An honest comparison, column against column.
Capsules win on convenience and oral ease. The pen wins on potency, dose control and documentation. Here are both sides, with no gloss.
| Criterion | NAD+ pen (Nadera) | NAD+ capsules / supplement |
|---|---|---|
| Bioavailability | Controlled form, known amount of NAD+ - bypasses breakdown in the gastrointestinal tract. | Limited and variable orally; precursors require conversion and first-pass metabolism. |
| Dose control / known dose | Pre-filled with a defined amount (500 mg or 1000 mg) - reproducible per occasion. | Labelled amount per capsule, but how much reaches the pool is hard to predict. |
| CoA / purity per batch | Certificate of analysis per batch, >=99% HPLC, third-party tested. | Purity and batch data vary between brands; a CoA is often not available. |
| Price per effective mg | Higher price per pen, but the amount you work with is known. 500 mg 1,695 kr - 1000 mg 2,395 kr. | Low price per tub, but unclear how much actually becomes available NAD+. |
| Format / convenience | Requires cold chain and handling of a pen; more than swallowing a capsule. | Maximally convenient - tub on the shelf, no refrigeration, no equipment. |
| Use | Pre-filled pen, ready to use the day it arrives. | Oral daily routine - easy to take, no preparation step. |
This comparison describes format and biochemistry for research purposes. Nadera supplies NAD+ only as research reference material, not for medical, veterinary or diagnostic use, and makes no claims about effects in humans.
Best NAD+
There is no official "best in test" - here is how to judge for yourself.
We publish no fabricated test results or winner badge. Instead: three criteria that genuinely separate a serious NAD+ from an arbitrary supplement. Measured against them, a pre-filled research pen is the research-grade choice.
Known, reproducible dose
A credible option gives the same defined amount every time. Pre-filled 500 mg and 1000 mg pens remove dose calculation and guesswork.
Documentation per batch
Purity without a certificate of analysis is a claim, not data. Ask for a CoA per batch (>=99% HPLC, third-party tested) before you trust the figure.
Frequently asked questions
NAD+ pen vs capsules - frequently asked questions.
NAD+ pen or capsules - which is best?
It depends on what you value. For maximum convenience and a low cost per tub, oral capsules are easiest. For a known dose, documented purity and bypassing the poor oral uptake, a pre-filled NAD+ pen is the potent route. For research work where the dose must be reproducible, the pen is the research-grade choice.
Is NAD+ poorly absorbed in capsules?
NAD+ is a large, charged molecule that is broken down in the gastrointestinal tract and absorbed only to a limited degree orally. Many NAD+ capsules therefore use precursors such as NMN or NR, which must be converted across several steps and pass the liver's first-pass metabolism. Uptake varies between individuals and occasions, making the actual amount of NAD+ hard to predict.
How do I evaluate a NAD+ supplement?
Look beyond the mg figure on the label: ask about bioavailability (how much actually becomes available NAD+), a known and reproducible dose, and a certificate of analysis per batch showing purity (>=99% HPLC) from an independent laboratory. Without a CoA, the purity figure is a claim, not data.
Which NAD+ is best in test?
There is no official independent "best in test" ranking of NAD+ that we can point to, and we publish no fabricated test results. Instead, judge by bioavailability, known dose and documented purity per batch. Measured against those criteria, Nadera's pre-filled research pen is the research-grade option, with a CoA and >=99% HPLC per batch.
The potent route
See the NAD+ penReady to work with a known dose of NAD+?
See Nadera's pre-filled NAD+ pen - 500 mg (1,695 kr) or 1000 mg (2,395 kr), pre-filled, stability-tested and with a certificate of analysis per batch. For in vitro laboratory research.
Pre-filled NAD+ pens, direct from the wholesaler.
Cold-chain dispatch from an EU warehouse, no customs. Replacement on any deviation. First-order satisfaction guaranteed.