Oral capsules are the default for good reasons, and the reasons are not glamorous: they are the cheapest route per dose, the easiest to actually keep doing, and the format behind nearly all of the human research anyone cites at you.
Who this format is for
Anyone running a maintenance routine over months and years rather than a short intensive protocol. If you want one decision, made once, that you can sustain without appointments or equipment, this is it.
What actually happens to a capsule
You swallow it. The capsule dissolves, the contents mix with stomach contents, and the active compound moves into the small intestine where most absorption happens. From there it enters the portal circulation and passes through the liver before reaching the rest of the body. That liver pass — first-pass metabolism — removes a meaningful share of many compounds.
Every criticism of oral delivery is some version of that paragraph. The criticisms are accurate. The question is whether they matter enough to pay ten or a hundred times more to avoid them.
The honest case against oral
- You lose a lot of the dose. Between digestion and the liver, the fraction reaching general circulation is well below what you swallowed.
- How much you lose varies. Stomach contents, transit time and individual differences all move the number, so your effective dose is less consistent than the label implies.
- It cannot produce a spike. If your goal is a sharp, large rise in NAD+ over hours, swallowing something will not do it.
The case for oral anyway
Cost per dose is not close
Oral is a monthly expense in the tens of dollars. Clinical routes are priced per session. Even allowing generously for absorption losses, the cost per unit of compound actually delivered still favours capsules by a wide margin for anyone dosing daily over a long period.
Adherence is the variable that actually decides outcomes
This is the part that gets lost. A route with modest absorption that you use every morning for two years delivers far more total compound than an excellent route you use six times and abandon. Across almost every category of supplementation, the thing that separates people who get a result from people who do not is whether they kept going. Capsules win that comparison by default, because there is nothing to schedule and nothing to tolerate.
It is what the research used
When someone cites a study on NAD+ precursors in humans, the odds are strong it was an oral protocol. If you want your routine to resemble the evidence base, oral is the format that does.
Getting it right
| Decision | What to do | Why |
|---|---|---|
| Compound | A named precursor at a stated dose | "Proprietary blend" means you cannot compare it to anything |
| Dose | Work in cost per milligram | Bottle price hides enormous differences in what is inside |
| Timing | Morning, consistently | Covered in detail in the timing protocol |
| Testing | Prefer third-party verified | Purity in this category has been uneven |
| Trial length | Judge at 90 days, not 10 | Shorter than that and you are measuring noise |
When to look at something else
Move off oral if your goal genuinely requires bypassing digestion — a short intensive protocol rather than long maintenance. In that case the realistic options are subcutaneous injection and IV infusion, and the oral-versus-IV comparison walks through the trade.
Do not move off oral because a product page told you capsules are "wasted." That framing is selling something, and it ignores the only variable that reliably predicts results: whether you keep taking it.