Phase-specific nutrition

Your body
changes
every week.
Your supplements
should too.

InSync is the first supplement system designed around your cycle — not against it. Four formulas. Four phases. One system that finally moves with you.

Try InSync with my cycle →
60-day guarantee
Free shipping
Made in USA
The problem

The supplement industry was built for men.
And they forgot to mention it.

Men have a 24-hour hormonal cycle. Women have a 28-day one. Yet every supplement on the market treats us the same — same capsule, every day, for a body that is fundamentally different every week.

It's not that supplements don't work. It's that they were never designed for you.

What the industry gives you
One formula. 365 days a year. Designed around male physiology and priced for maximum margin.
What your body actually needs
Different nutrients at different times — because your iron needs on day 2 are nothing like your magnesium needs on day 22.
The result
A graveyard of half-empty bottles. Inconsistency. And the quiet feeling that you're just not trying hard enough — when the truth is, no one gave you the right tools.
"
The sachet system fixed my consistency. I open the box, see the phase label, take it with breakfast. Three months straight — a personal record.
Eileen A. Verified buyer
Tereza, Founder of InSync
Tereza
Founder & CEO, InSync
Why I built this

I've had PCOS my
whole life. Then my
body said enough.

I did what women do — I pushed through and pretended everything was fine. Until one of the hardest years of my life hit all at once, and my body, which had been quietly struggling for years, finally stopped cooperating.

A cyst burst. My ovary started to turn. I was rushed into emergency surgery, and the surgeon removed part of my ovary on the operating table.

When I came around and asked what I could do to prevent it from happening again, the answer I got was: "You can't. Maybe the pill will help."

I wasn't willing to accept that.

"The entire wellness industry was built around male physiology. Men have a 24-hour hormonal cycle. Women have a 28-day one. Yet every supplement treated us like men with a ponytail."

When I started supplementing according to my actual cycle phases — giving my body what it specifically needed at each stage — something shifted that nothing else had managed to move.

The luteal week got quieter. The crashes softened. My body started feeling less like something happening to me and more like something I could finally work with.

So I spent months working with specialist formulators to build what I wished had existed when I was sitting in that hospital bed, wondering what came next.

That's why I built InSync →
The system

Four phases.
Four formulas.

Each sachet contains exactly what your body needs for that specific week — not what's cheapest to manufacture.

Phase 1 · Days 1–6

Menstrual

“Replenish what your cycle takes.”
Ferrous glycinate — 2.4× more bioavailable than standard iron
Magnesium glycinate — most absorbable form available
Quercetin 98% — pharmaceutical-grade purity
Methylfolate B9 — active form, not synthetic folic acid
Phase 2 · Days 7–13

Follicular

“Build toward your peak.”
CoQ10 Ubiquinol — active form, supports rising energy
Omega-3 — supports follicular environment
Flaxseed extract — lignans for estrogen metabolism
Cardamom + Fennel — digestive support as appetite increases
Phase 3 · Days 14–17

Ovulatory

“Support your peak. Process it cleanly.”
DIM — healthy estrogen clearance at peak levels
Milk thistle 80% — liver support for hormone processing
Citicoline — cognitive sharpness at your strongest week
Full B-complex — energy co-factors for your peak
Phase 4 · Days 18–28

Luteal

“The week you dread. Finally supported.”
KSM-66 Ashwagandha — 24 clinical studies on stress & cortisol
L-Tryptophan — serotonin precursor as progesterone peaks
Lemon balm — calm and sleep quality support
Magnesium glycinate — second hit, luteal demand is highest here
What to expect

This is not a
one-week fix.

Real hormonal support compounds over time. Here's what consistent use actually looks like.

1
Cycle

The foundation is being laid.

Most women notice their luteal week feels slightly less sharp — the crash is softer, the irritability quieter. Energy during menstrual phase feels more supported than usual.

Magnesium, iron, and B vitamins begin replenishing what your cycle depletes.
2
Cycles

This is usually when it clicks.

The luteal week feels noticeably different. Partners notice before you do. Sleep in the days before your period is more stable. The "not myself" week still comes — but it's shorter.

Ashwagandha's adaptogenic effect is now fully active after consistent accumulation.
3
Cycles

You're tracking differently now.

Not dreading it. Most women at this stage can feel phase transitions more clearly, and the extremes have softened. The follicular and ovulatory phases feel more energized.

CoQ10 ubiquinol is supporting cellular energy production across both phases.
6
Cycles

This is no longer something you're "trying."

It's part of how you manage your month. You know which sachet you're on, you know what's coming, and you feel prepared rather than blindsided.

The cumulative effect of consistent phase-matching is fully compounding.
I'm ready to start →
60-day money-back guarantee if you don't feel the difference.
Real women. Real cycles.

What consistent use
actually feels like.

★★★★★
"I have a graveyard of half-used supplement bottles. The sachet system fixed all of that. I've been consistent for three months — a personal record."
Eileen A. Verified
★★★★★
"The luteal week used to write off my entire productivity. By cycle three I noticed the crash just... didn't come the same way. My husband noticed before I did."
Sarah M. Verified
★★★★★
"I was skeptical about cycle syncing. The science section convinced me to try it. Two cycles in and I genuinely feel like I understand my body for the first time."
Jess T. Verified
Questions

Honest answers to the questions you're actually asking.

I'm on hormonal birth control — can I still take this? +
InSync contains no hormones — only micronutrients, adaptogens, and botanicals that support your body's own processes. If you're on hormonal contraception, you can follow the phase schedule based on your pill pack: active pills align with follicular and ovulatory phases, placebo week with menstrual.
Is cycle syncing actually backed by science — or wellness pseudoscience? +
The hormonal variation across your cycle is well-documented. Each phase involves distinct changes in estrogen, progesterone, and other hormones that affect energy, sleep, mood, and nutrient metabolism. InSync's formulas are built on peer-reviewed research about how these changes create different nutritional needs week to week.
My cycle is irregular. How do I know which sachet to take? +
We have a detailed protocol for irregular cycles in your welcome guide. Generally, you track by symptoms rather than calendar dates — we teach you to recognize the signs of each phase so you can follow your actual biology, not an average.
What if it doesn't work for me? +
You get 60 days to try InSync with no risk. If you don't notice a meaningful difference after two full cycles, contact us for a full refund. We ask that you be consistent — one sachet per phase per day — because the results compound over time.
Ready?

Your body has been asking for this for years.

One system. Four formulas. Designed around how women actually work — not how the supplement industry finds it convenient to sell to us.

Try InSync with my cycle →
60-day guarantee
Free shipping
Made in USA
InSync team holding phase sachets