Your supplements should work with your cycle, not against it.

Cycl is a supplement tracker that personalizes what you take, when you take it, and how it changes across your cycle.

You take a handful of supplements every morning.

Some came from TikTok. One was a friend's recommendation. Another was something a doctor mentioned once, offhandedly, two years ago.

Nobody told you they might not work together.

Calcium and iron cancel each other out. Zinc and copper compete for the same receptors. Most people are unknowingly paying for supplements that fight each other.

And nobody told you timing matters just as much.

Iron away from coffee. Magnesium before bed, not the morning. Fat-soluble vitamins with a meal. The when is half the equation — and most routines completely ignore it.

Your body isn't the same every week.

In your follicular phase, you absorb iron better and recover faster. In your luteal phase, magnesium becomes critical and high intensity training works against you. No supplement brand accounts for any of this.

$80–150 a month. Most of it not working.

Not because you're doing it wrong. Because the information was never designed for how your body actually works.

$0B

women's hormonal supplement market — projected to nearly double by 2032 ¹

of supplement TikToks cite zero scientific evidence for their claims ²

of supplement users say personalized regimens matter — yet most products are one-size-fits-all ³

¹ Data Bridge Market Research, Women's Hormonal Supplements Market Report, 2023

² Harvard T.H. Chan School of Public Health, analysis of supplement-related TikTok content, 2024

³ Council for Responsible Nutrition (CRN), Consumer Survey on Dietary Supplements, 2024

What Cycl actually does

Not a tracker. Not a store. Something more useful — a plan that changes as you do.

Follicular

Iron

B12

→

Luteal

Mag

Your supplements shift with your cycle

Your follicular phase and your luteal phase are completely different experiences. Cycl gives you different supplements, different doses, and different timing for each phase — because a one-size-fits-all stack doesn't fit anyone.

Your stack, checked for conflicts

Calcium and iron cancel each other out. Zinc and copper compete for the same receptors. Cycl flags every conflict in your current stack, tells you why, and shows you how to fix it — before you waste another month.

Menstrual

Recovery

Follicular

HIIT

Ovulatory

Peak

Luteal

Light

Workouts that match your phase

HIIT in your follicular phase, not your luteal. Recovery days when your body actually needs them. Cycl tells you what intensity to train at and adjusts your supplement timing around your sessions.

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magnesium nights

Sleep that connects the dots

Log how you slept, and Cycl starts finding patterns. Better rest on magnesium nights. Worse sleep in your luteal phase. After a week of entries, you'll see what's actually working — and what isn't.

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Tell us where you are

Log your last period or connect your tracker. Takes about a minute. Cycl works out your current phase and maps the next four weeks.

Add what you're taking

Drop in your current supplements. Cycl checks what works together, what doesn't, and what's missing for where you are in your cycle.

Follow your daily plan

Wake up to a clear plan — what to take, when, and why. It updates automatically as your cycle moves. No spreadsheet required.

The people behind Cycl

We started Cycl because the supplement industry wasn't built for women. We're changing that.

Ryana Velani

Healthcare

Background in healthcare and women’s health. Ryana brings clinical insight to make sure everything Cycl recommends is grounded in real science.

Justin Shieh

Engineering

Full-stack engineer building the platform from the ground up. Justin turns research into a product that actually works.

Alex Ning

Marketing

Leads growth and brand strategy. Alex makes sure the right people hear about Cycl — and that the message is honest.

available now

Want to know what's actually worth taking?

Download Cycl and start cycling your stack with the science.