The tiredness you put down to getting older has a name, and it is not “getting older”
Why the afternoon nap arrived in your forties, why HRT, coffee and the supplement drawer never quite moved it, and the molecule your cells have been running short of the whole time (no clinic, no appointment, no miracle).
Dear friend who has started needing the afternoon nap,
If you have found yourself lying down before going out for dinner, so that you can get through dinner.
If the morning coffee has stopped doing what it used to do.
If you are two years into HRT, and it helped, and you are still foggy in a way nobody warned you about.
If there are six things in the supplement drawer and you could not say which one is doing anything.
Then this is written for you, and you are not imagining it.
None of the people who described those things to us were ill. That is the part that gets missed. There was nothing to diagnose, so there was nothing to treat, so it became the new normal. And the new normal is what you plan around: the early night, the nap, the things you stop saying yes to.
Why you never heard this
Nobody lied to you
If you have never heard what follows, it is not because you did not look. Almost everything sold for energy is sold in the form that is easiest to sell, and a capsule is easy to sell. It has one problem it cannot solve, which we will come to. The people who do know the alternative, the clinics, are paid per session, and a treatment that costs several hundred pounds a visit is not one anyone is in a hurry to teach you to do at home.
The convenient thing and the profitable thing were never the thing that worked.
We are a small UK company. We make one molecule, in one form, in a UK facility. Everything below is either basic cell biology you can look up, or a plain statement of what we sell.
The line that stopped us
A schedule, not a symptom
“I no longer fall asleep during the day now, i used to have to sleep before going for dinner, no more.”Andy, verified customer review, August 2026
He was not describing exhaustion. He was describing a schedule. The nap had become a fixed point the rest of the day was arranged around, and he had stopped noticing it was strange. That is what this tiredness does. It does not arrive as a crisis. It arrives as a routine, and routines do not get questioned.
The mechanism
Spent, not stored
Inside every cell you own is a molecule called NAD⁺. Not a vitamin, not a stimulant. It carries energy out of your food and into the parts of the cell that make you run, and it is consumed every time a cell repairs its own DNA.
Two facts about it explain everything above.
Your level of it falls as you age. This is not a marketing claim; it has been measured in human skin, brain tissue and blood. Your cells in your forties have less to work with than they did in your twenties, and you did nothing wrong.
And the one nobody tells you: NAD⁺ is spent, not stored. Your cells keep no reserve. They make it and burn through it continuously, so the level you carry is a balance, not a tank. Repairing DNA destroys it outright.
What has to be true
Three things at once
For anything to change the level your cells carry, three things have to be true at the same time.
- It has to reach the bloodstream as NAD⁺.
- It has to be repeated, because the pool drains again.
- It has to be enough to matter.
A capsule fails the first. Swallowed NAD⁺ meets the digestive system before it meets your blood. This is why people write “after about 2 years with no noteworthy results,” and why someone who “tried using NMN supplements” had “not noticed any improvements.” They were not doing it wrong. The route was wrong.
A clinic drip passes the first and fails the second. It gets the molecule in properly, then costs £250 to £900 a time, plus the appointment, plus being “told to come back in 1.5hrs as she was going on lunch.” Almost nobody repeats that monthly. So the level rises, drains, and you are back where you started.
The supplement drawer fails all three, which is why it is a drawer.
| Reaches the blood as NAD⁺ | Repeated on a cadence | Enough to matter | |
|---|---|---|---|
| Capsuleswallowed | ✕ | ✓ | moot |
| Clinic drip£250 to £900 a visit | ✓ | ✕ | ✓ |
| At-home penon a plan | ✓ | ✓ | ✓ |
What is left
The thing the clinics use, made repeatable
DIYNAD+ NAD⁺ Pen
NAD⁺ and water for injection. Nothing else in the vial. Pharmaceutical grade, manufactured in the United Kingdom, in a pre-measured auto-injector pen you use at home, under the skin, every other day. Nothing to draw up, nothing to calculate.
It comes on a plan because the molecule is spent, not stored. One pen raises the level. The plan is what holds it there.
What people say
★★★★★Rated 4.8 from verified reviews
“I absolutely love the product. It's been life changing for me. My energy levels are back to normal, I don't get the brain fog like I used to. And the pen makes it so much easier to use.”Anita G., verified buyer
“My partner has been using this for just over a month now, and his sleep has improved dramatically. He also says his energy levels have increased substantially.”Jaz D., verified buyer
The honest answers
If the schedule at the top sounded like yours, the product page explains the two strengths, the plan, and exactly what is in the vial.
See the NAD⁺ PenDIYNAD+ is a Certified Health Group brand. Not for use if pregnant, breastfeeding or under 18. Speak to your GP or pharmacist first if you take prescription medication or have a diagnosed condition. Privacy policy · help@diynad.com