You're not training too hard. You're recovering on half a budget.

“At 30 you recovered from that session in a day. The session hasn't changed. What pays for the recovery has.”
It shows up on day two, not day one
You get through the session fine. It is the Wednesday after Monday that changed - the warm-up taking longer, the second hard day arriving before the first one has cleared, niggles that used to resolve in a week now hanging around for three.
So you deload. You sleep more. It helps a little, and the ceiling stays where it is. Which is the clue: if rest were the answer, more rest would have fixed it.
Rest is permission. Repair is the work.
Training does not make you fitter. It damages you in a structured way, and the adaptation happens afterwards - while you are asleep, when cells clear the damage and build back stronger. Rest creates the window. It does not do the job.
The job is cellular, and it costs energy. Every repair enzyme, every rebuilt fibre, every bit of overnight housekeeping is paid for out of the same account as everything else your body is doing.
The session damages
Structured, deliberate, and useless on its own. Nothing has improved yet.
The night pays
Repair enzymes clear the damage and rebuild. This is where fitness is actually made.
You get the adaptation
Or you get part of it, and carry the rest into the next session as accumulated cost.
Energy gets paid first. Repair takes what's left.
NAD⁺ is the coenzyme mitochondria use to make energy, and the same one repair enzymes need to work at all. Two systems, one shared pool, both drawing hardest overnight. When supply is short, staying alive outranks getting fitter - so repair is what gets rationed.
And NAD⁺ declines with age. By your forties you are doing the same training on roughly half the pool you had at 25. Nothing is broken. You are asking for the same adaptation on a smaller budget, and getting a proportionally smaller one.
Blood NAD⁺ against participants' own baseline after 14 days of nicotinamide riboside supplementation.¹

Protein and creatine are materials, not funding
Nothing wrong with either - keep taking them. But protein is bricks and creatine is a fuel buffer for the set itself. Both assume a cell with the capacity to use them.
That is the gap in every recovery stack I see: materials delivered, machinery untouched. Deliver more bricks to a smaller crew and you get a smaller build.
What MUTO is
One product. Sixty capsules, thirty days, two a day. A cellular energy formula built around nicotinamide riboside - the raw material your body converts into NAD⁺ - with every dose printed in full at research level. Three jobs, no overlap:
Nicotinamide riboside at 300mg, plus zinc, copper and six B vitamins in active forms.
Your body breaks NAD⁺ down as fast as it makes it. Pterostilbene, quercetin, grapeseed and turmeric extract keep raised levels raised for longer.
CoQ10 to help mitochondria convert it into usable energy, and BioPerine® so the formula is absorbed rather than passed through.
No stimulants. Nothing that flatters tomorrow's readiness score without doing the work behind it - and nothing that overlaps with what you already take, because the doses are all on the label.
What better recovery is worth
More usable sessions
Not more training. The same week, with less of Monday still in your legs on Wednesday.
The adaptation you paid for
You already did the hard part. This is about collecting on it rather than leaving some behind.
Fewer stubborn niggles
The queue that never clears is what turns a small strain into six weeks off.
Ageing better, as a side effect
Repair capacity is repair capacity. The system that recovers your training is the one that maintains everything else.
£29 for the first month is less than a single physio appointment, and roughly what you spend on coffee in a week.
Check it on your own data
Screenshot your 30-day HRV, resting heart rate and sleep averages before capsule one. Nothing happens on day one - by design. Feel usually arrives in weeks three to four, and the data typically moves between day 30 and day 60. Read the weekly average, not a single morning.
If the trend has not moved by day 90, tell us and we refund you. No returned pouches, no argument about how you felt.
£29 for your first month, then £55
Up to 58% off the one-time price. Cancel any time. 90-day money-back guarantee.
¹ Conze, D., Brenner, C., & Kruger, C. L. (2019). Scientific Reports, 9(1), 9772. Blood NAD⁺ measured against participants' own baseline over 14 days of nicotinamide riboside supplementation.
MUTO is a food supplement and is not intended to diagnose, treat, cure or prevent any disease. It is not a treatment for injury and is not a substitute for training, sleep or a varied diet. Consumer wearables are not medical devices and their readings are estimates. If you are pregnant, breastfeeding or taking prescribed medication, speak to your doctor before use. Cost comparison is illustrative. Timings described are typical and not guaranteed; individual results vary.