Your body changes every week. Your supplement doesn't.
Day 3 of your cycle and day 21 are two different bodies. InSync is the first sachet system with a different formula for each of your four phases — so you're finally supplementing the woman you are today.
Start my first cycle
See what your body actually needs, day by day
Your body right now
What's in your sachet
The supplement industry treats you like a man with a ponytail
Men run on a 24-hour hormonal cycle. Women run on a 28-day one. Yet nearly every supplement on the market is one formula, 365 days a year, taken with breakfast — a male protocol with a pink label.
Why? Because one product is easier to make, easier to market, and far more profitable.
Your energy on day 3 is not your energy on day 21. Your nutritional needs, your sleep, your mood, your focus — all different. That's not a bug. It's by design. And it's exactly what the research on cycle physiology has been saying for years.
You're not broken. You're not inconsistent. You've just been given the wrong tool.
One sachet per day. Four formulas. Matched to what your body is actually doing.
Each sachet holds pre-sorted, phase-specific capsules. Tear it open, take it with breakfast, done. No counting, no four bottles, no "did I take it today?"
Menstrual
"Replenish what your cycle takes."
Follicular
"Build toward your peak."
Ovulatory
"Support your peak — and process it cleanly."Luteal
"For the week you feel 'not yourself'."The whole protocol takes ten seconds
Check your phase
Your box is labeled by phase and day range. Not sure where you are? The phase guide inside your kit tells you exactly — day 1 is always the first day of your period.
Tear open today's sachet
Pre-sorted, pre-portioned, phase-specific capsules. No counting, no opening four bottles, no wondering if you grabbed the right one.
Take with breakfast. Move on.
Sachets fit in a handbag, gym bag, or coat pocket — your routine travels with you. Consistency is the whole mechanism, so we made it the easiest part.
What consistent use actually looks like
We won't promise you a new body in seven days. InSync works with your cycle — which means it takes cycles, not days. Here's the honest timeline most women report.
The foundation gets laid
Most women notice the luteal week feels slightly less sharp — the crash is softer, the irritability a little quieter. Energy during your period may feel more supported than usual.
What's happening: magnesium glycinate, iron, and B vitamins begin replenishing what your cycle depletes. KSM-66 ashwagandha starts building its cortisol-regulating effect — this takes consistent use to accumulate.*
This is usually when it clicks
The luteal week feels noticeably different — partners often notice before you do. Sleep before your period is more stable. The "not myself" week still comes, but it's shorter and less disruptive.
What's happening: two full supported cycles complete. Ashwagandha's adaptogenic effect is fully active; L-tryptophan and lemon balm support serotonin precursor availability in your highest-need phase.*
You track your cycle differently — not dreading it
Most women report feeling phase transitions more clearly, with softer extremes. Follicular and ovulatory weeks feel more energized. The luteal week is no longer a write-off.
What's happening: CoQ10 ubiquinol supports cellular energy in follicular and luteal phases, and the cumulative effect of phase-matching compounds.*
It's not something you're "trying" anymore
The system becomes how you manage your month. You know which sachet you're on, you know what's coming, and you feel prepared rather than blindsided.
Hi, I'm Tereza. I built this from a hospital bed.
I've had PCOS my whole life. For most of it, I managed — I did what women do. I pushed through and pretended everything was fine.
Then one of the hardest periods of my life hit all at once, and my body, which had been quietly struggling for years, finally said enough. A cyst burst. My ovary started to turn. I was rushed into emergency surgery, and the surgeon removed part of my ovary on the table.
When I woke up and asked what I could do to prevent it from ever happening again, the answer was: "You can't. Maybe the pill will help."
So I went looking for answers the way most of us do — obsessively, at 2 a.m., in every corner of the internet. I tried everything:
Some things helped a little. Nothing helped enough. Then I found the thing that reframed everything: the entire wellness industry was built around male physiology. When I started supplementing according to my actual cycle phases, 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.
What I'd built for myself required months of research, a dozen products, and a part-time job's worth of remembering. Most women don't have that time — and they shouldn't have to. So I spent two years with specialist formulators building what I wished had existed when I was sitting in that hospital bed.
Four sachets. Four formulas. One system that moves with your cycle instead of pretending it doesn't exist. That's InSync.
What women are saying
"I have a graveyard of half-used supplement bottles. I never finish anything. The sachet system fixed all of that — I open the box, see the phase label, take it with breakfast. I've been consistent for three months, which is genuinely a personal record."
"Normally I know about each ovulation well in advance — I can feel my breasts, my stomach, tension. This time it went smoothly. The notifications that usually came were so mild that I didn't notice them. And why was I surprised? Because I only used one pack — and actually such a fundamental change. I'm going to buy more."
"I have migraine problems and one of the main causes is hormonal changes during the cycle. Already in the first month of use, I didn't have a migraine before my period for the first time in several years. My cycle has stabilized, the abdominal pain has significantly weakened and shortened. I feel PMS very minimally, if not at all. I 100% recommend it!"
InSync with My Cycle
One full cycle of phase-matched support — 28 daily sachets across all four formulas, plus your phase guide.
- 28 daily sachets — one full cycle, four formulas
- Phase guide included (works for irregular cycles too)
- Free US shipping
- 100% money-back guarantee — one email, no forms
Give it one full cycle. If nothing shifts, email us within 30 days and the money comes back — no forms, no being passed between agents.
Frequently asked questions
I'm on hormonal birth control — can I still take this?
This is the question we get most often, so we'll answer it properly rather than just say "consult your doctor" and leave you there.
InSync does not contain hormones. It contains micronutrients, adaptogens, and botanicals that support your body's own processes — nothing that introduces external hormones or directly interferes with contraceptive mechanisms.
If you're on hormonal birth control, follow the phase schedule based on your pill pack: active pills follow the follicular and ovulatory phases, and the placebo week aligns with menstrual. Many women on hormonal contraception still experience cyclical symptoms — particularly in the placebo week — and report benefit from InSync.
If you're on any specific medication beyond contraception, checking with your doctor is always the right move.
Is cycle syncing actually backed by science — or is this wellness pseudoscience?
Fair question. The wellness world has done a lot of damage with vague "hormone balancing" claims, and we understand the skepticism.
Here's what the science actually says: female hormonal cycles are well documented to affect nutritional needs, energy metabolism, mood regulation, and inflammatory response across the month. This isn't fringe research — it's established endocrinology.
What InSync does is match specific, evidence-backed ingredients to the phases where the research supports their use: magnesium glycinate and iron during the menstrual phase, when your body is actively losing both; KSM-66 ashwagandha during luteal, where 24 clinical studies support its effect on cortisol and stress response; CoQ10 ubiquinol during follicular and ovulatory, where cellular energy demands rise.*
We're not claiming to "balance your hormones." We're supporting what your body is already doing — at the right time, with the right ingredients.
My cycle is irregular. How do I know which sachet to take?
This comes up a lot — especially from women with PCOS, which is part of why Tereza built InSync in the first place.
Use your period as your anchor. Day 1 is always the first day of bleeding — start with the Menstrual sachet there, regardless of how long your previous cycle was. From that anchor: days 1–6 Menstrual, 7–11 Follicular, 12–16 Ovulatory, then Luteal from day 17 until your next period arrives.
If your cycle is very long or unpredictable, you may spend more time in the Luteal phase — which for most women with irregular cycles is exactly where the most support is needed anyway. You can also pick and mix your own box to match your cycle. If you're ever unsure, email us and we'll help you figure it out personally.
How long until I notice a difference?
Most women notice something during cycle one — a softer luteal week, better sleep in the days before their period, less of the crash. But the full effect takes two cycles to build.
This is why we're honest about it rather than promising results in seven days. InSync works with your cycle — which means it takes at least one full cycle to begin demonstrating what it does. If you complete two full cycles and genuinely feel nothing has shifted, we'll refund everything.
Does this replace my multivitamin?
For most women, yes — InSync covers a broader and more targeted micronutrient profile than a standard multivitamin, in bioavailable forms most multivitamins don't use: methylfolate rather than folic acid, ferrous glycinate rather than ferrous sulphate, magnesium glycinate rather than magnesium oxide.
If you're taking a specific supplement for a diagnosed deficiency — iron, vitamin D, B12 — check the InSync ingredient list first. It may already be covered at a meaningful dose.
Will I actually stick with this? I have a supplement graveyard.
We built the sachet format specifically for this problem. There's nothing to measure, nothing to sort, nothing to remember beyond which phase you're in. You open the sachet for your current phase, take the capsules with breakfast, and you're done. The phase label does the thinking for you.
Consistency is the whole mechanism — so we designed the format to make consistency the easiest part.
What if it doesn't work for me?
Email us within 30 days of receiving your order. We'll refund everything — no forms, no lengthy process, no being passed between customer service agents.
We ask that you give it one full cycle before deciding — not because we're stalling, but because judging InSync before your first cycle is complete is like judging a Netflix series on the first ten minutes. One cycle. If nothing shifts, the money comes back.