Day 1–14 · Purple Semi
First half of your cycle
Flax seeds + pumpkin seeds
From the first day of your period until around ovulation. Flax is one of the richest food sources of plant lignans, and pumpkin seeds bring zinc and magnesium.
Seed cycling, explained
What is seed cycling? A simple, honest guide
Seed cycling is a food-based practice that pairs different seeds with the two halves of your menstrual cycle: flax and pumpkin seeds from day 1 to 14, and sesame and sunflower seeds from day 15 to 28.
It's simple, gentle and made from everyday foods. This guide covers how it works, how much you need, and what the research says so far.
How seed cycling works
Your cycle has two halves. Seed cycling simply changes which seeds you eat in each one.
Day 15–28 · Pink Semi
Second half of your cycle
Sesame seeds + sunflower seeds
From around ovulation until your next period. Sesame seeds bring calcium and lignans, and sunflower seeds bring vitamin E and selenium.
Irregular periods, or none at all?
Follow the moon instead: flax and pumpkin from new moon to full moon, then sesame and sunflower from full moon to the next new moon. It gives you a steady monthly rhythm, and suits perimenopause and menopause too.
How much of each seed?
Most seed cycling guides suggest about a tablespoon of each seed a day. That's roughly 10 g of each of the two seeds for your phase.
Each Semi bar has about 10-12 g of each seed for its phase, already cleaned, evenly roasted and portioned. So one bar a day covers it: no grinding, no measuring.
- About 10-12 g of each phase seed in every bar
- Seeds cleaned and evenly roasted
- One bar a day, nothing to measure
What the research says (and doesn't)
We'd rather be honest than hype it. Here's where the science stands, with links so you can read it yourself.
Systematic review · 2025
10 studies, 635 women
Researchers reviewed 10 studies, mostly from India and Iran. They concluded that seed cycling could be a positive complementary approach, while noting that the studies were small and used different methods.
Source: Nagarajan et al., Cureus (2025)
Clinical study · 1993
Flaxseed and the menstrual cycle
In a small study of 18 women, adding flaxseed for three cycles was linked to a slightly longer second half of the cycle. It looked at flax alone, not seed cycling as a whole.
Nutrition facts
What the four seeds contain
Flax, pumpkin, sesame and sunflower seeds naturally contain fibre, healthy fats, lignans, zinc, magnesium, calcium, vitamin E and selenium, nutrients your body uses every day.
Our honest take
Seed cycling research is still early. Most studies are small, and researchers are calling for larger trials. We see seed cycling as a gentle, food-first habit, not a treatment, and we'll keep this page updated as new research comes out. If you're managing a health condition, keep following your doctor's advice.
Seed cycling questions
What is seed cycling?
Seed cycling is a food-based practice that pairs different seeds with the two halves of your cycle: flax and pumpkin seeds from day 1 to 14, and sesame and sunflower seeds from day 15 to 28.
How much of each seed do I need?
Most guides suggest about a tablespoon (roughly 10 g) of each of the two seeds for your phase, every day. Each Semi bar has about 10-12 g of each, so one bar a day covers it.
Does seed cycling work?
Early research is promising but limited. A 2025 review of 10 studies found it could be a positive complementary approach, and called for larger trials. We see it as a gentle, food-first habit, not a treatment, and most women stay with it for at least three cycles.
What if my periods are irregular or have stopped?
Follow the moon: flax and pumpkin from new moon to full moon, then sesame and sunflower from full moon to the next new moon. This works through perimenopause and menopause too.
Should I grind the seeds myself or use Semi?
Both follow the same idea. Loose seeds need cleaning, roasting, grinding and measuring every day. Semi has the right seeds already measured into one ready-to-eat bar, in five flavours.
Can I do seed cycling if I have a health condition?
Seed cycling uses everyday foods, and many women follow it alongside their usual routine. If you take medication, are pregnant or breastfeeding, or are managing a health condition, please check with your doctor first.
Seed cycling, without the effort
One Semi bar a day: the right seeds for each phase, already measured and ready to eat.
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