★★★★★ 4.8/5.0 · trusted by women 40+

Your focus didn't leave. Your cells are running low on fuel.

That afternoon fog and the energy that won't come back with sleep aren't "just stress." After 40, your cells make less of the fuel they run on, NAD+, right when perimenopause is asking even more of them.

Start with S3 — up to 45% off Free shipping · 30-day money-back promise

✓ Made in the USA✓ Zero stimulants✓ Vegan capsule

Woman 48 holding S3, warm vibrant smile, with embedded PERIMENOPAUSE SUPPORT pill + NAD+ science badge.

S3 bottle + list of 5 benefits (text in image).

Trusted by 2,000+ customers, 4.8/5.0, testimonials (text in image).

What to expect timeline, Week 1 / Week 4 / Month 3 (text in image).

Cellular science infographic, what S3 does inside your cells (text in image).

You're not imagining it. Your cells feel different after 40.

The fog that makes you doubt yourself

The word that won't come. The room you forgot why you entered. It's not you slipping, it's your brain low on cellular fuel.*

The 3pm wall

The crash no second coffee fixes. Caffeine can't refill what's actually low: the NAD+ your cells run on.*

The sleep that doesn't recharge you

You slept, but wake up already behind. When cells run low on NAD+, even a full night doesn't refill the tank.*

Most NAD+ burns off before your body can use it.

Raising NAD+ isn't enough on its own. S3 gives you all three: the fuel, the accelerator that puts it to work, and the protector that keeps it from burning off.

The Fuel

500mg

NAD+

The coenzyme your mitochondria use to make energy.*

The Accelerator

150mg

Resveratrol

Supports the sirtuins that put your NAD+ to work.*

The Protector

250mg

Quercetin

Helps protect your NAD+ and clear worn-out cells.*

★★★★★ 4.8/5.0 · verified reviews

Real reviews from women 40+

★★★★★

Finally not dead by 3pm

I'm 56, two teenagers, and I help take care of my mom, so my afternoons were honestly a write-off. I'd be staring at my screen by 3 doing nothing. I've been taking this for about a month now and I actually get through the afternoon without needing to lie down. Didn't expect much, pleasantly surprised.

Alexandra M. ✓ Verified Customer

★★★★★

Did not think this would do anything

Every doctor told me my bloodwork was fine and to just sleep more, and the last three supplements I bought are sitting in my cabinet doing nothing. So I went into this pretty skeptical. I'm on week 6 and I do feel a difference, it's not dramatic but my energy is steadier and I'm not crashing the way I was. Going to keep ordering it.

Danielle R. ✓ Verified Customer

★★★★★

No jitters which is what I was worried about

I can't do coffee past the morning or I'm up all night, so I was nervous this would be the same kind of buzzy energy. It's not. I just feel a bit more clear-headed during the day and there's no crash later. Took maybe two weeks before I noticed it. Happy with it so far.

Sophia L. ✓ Verified Customer

Sirtua S3

NAD+ · Quercetin · Resveratrol

The ultimate 3-in-1 longevity stack. Powered by cutting-edge research.

Supports steady, all-day cellular energy
Supports focus and helps clear the afternoon fog
Built to support steady energy and focus through perimenopause
Supports your body's natural cellular maintenance

How many bottles?

Why buy three bottles when one capsule does it?

Buying premium NAD+, resveratrol, and quercetin as three separate supplements runs $120+ a month, and you're juggling three bottles. S3 puts all three clinical-dose actives into one daily capsule.

Sirtua S3

3 separate bottles

Monthly price

$53.40

$120+

All 3 actives, clinical doses

✓

if you buy all 3

Capsules to take a day

1

3+

Per day

$1.78

$4+

$1.78a day on subscription

3-in-1actives in one capsule

30 daysmoney-back promise

Any last questions?

NAD+ works at the cellular level. Many notice steadier energy and clarity within the first weeks, with deeper support building over months. That's exactly why it's backed by the 30-day promise.

No. The energy S3 supports is cellular, not a stimulant buzz. Zero caffeine.

Yes. S3 has no calories and no sugar, so it fits cleanly into a GLP-1 routine. When you're eating a lot less, your cells take in fewer of the building blocks they use to make energy, which is why so many women on a GLP-1 hit a wall of afternoon fatigue even as the weight comes off. S3 is built to support that cellular energy while you eat less: the NAD+ your cells run on, plus the actives that help them use it. It won't interfere with how your GLP-1 works. As always, talk to your doctor about any medication you're taking.

Two capsules daily with about 6oz of water. Most people take it in the morning.

30 days, money back. If you don't feel a real difference, you get a full refund, even the empty bottle.