Nutrition8 min read
Seed Cycling for Hormonal Balance: Does It Actually Work?
Seed cycling claims to balance your hormones naturally by eating specific seeds during each cycle phase. We looked at the evidence behind the trend.
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Live in sync
Science-backed insights on cycle syncing, hormonal skincare, and building routines that work with your body — not against it.
Nutrition
Cycle Syncing8 min read
What Is Cycle Syncing? The Complete Beginner's Guide
Discover how aligning your lifestyle with your menstrual cycle phases can transform your energy, skin, mood, and overall well-being.
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Skin Science7 min read
How Your Menstrual Cycle Affects Your Skin (And What to Do About It)
Your skin changes every week because your hormones do. Learn how estrogen and progesterone impact your complexion—and how to adapt your skincare routine accordingly.
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Fitness6 min read
The Best Workouts for Each Phase of Your Cycle
Stop forcing yourself through HIIT when your body needs rest. Learn how to match your workouts to your cycle for better results, more energy, and fewer injuries.
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Nutrition7 min read
Eating for Your Cycle: A Phase-by-Phase Nutrition Guide
Your nutritional needs change throughout your cycle. Learn what to eat (and why you crave what you crave) in each phase to support energy, mood, and hormonal balance.
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Skincare6 min read
Why Your Skincare Routine Should Change Every Week
Using the same products every day? You're missing out. Learn how to create a weekly skincare rotation that adapts to your skin's changing needs throughout your cycle.
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Fitness9 min read
The Fitness Industry Was Never Built for Women — Here's the Proof
Women were literally excluded from exercise science until the 1990s. Every 'standard' workout program you follow was designed for male hormones. It's time to talk about it.
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Research11 min read
We Analyzed 5,247 Skin Scores Across Menstrual Cycles: Your Best Skin Day Is Predictable
Original data from 1,832 Sister Glow Up users reveals exactly when your skin peaks, when it bottoms out, and why predictive skincare outperforms reactive skincare by 23%.
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Comparison9 min read
Sister Glow Up vs Flo vs Clue: Which Period Tracker Actually Helps Your Skin? (2026)
Most period trackers tell you when your period is coming. Only one tells you why your skin looks terrible right now — and what to do about it. A real comparison.
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Guide13 min read
The Complete Guide to Cycle Syncing Your Skincare: What to Use in Each Phase
Your hormones change every week. Your skincare routine should too. A comprehensive, phase-by-phase guide to cycle syncing your skincare — with specific ingredients, timing strategies, and the science behind it all.
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Women's Health8 min read
Your PMS Symptoms Are Not Normal — Here's What They're Actually Telling You
Society told you that period pain, mood swings, and crippling fatigue are just 'part of being a woman.' That's a lie. Severe PMS is your body screaming that something is off.
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Research9 min read
We Tracked 3,000 Skincare Routines by Cycle Phase. The Results Were Wild.
We analyzed skincare logging data from 3,127 Sister Glow Up users over 4 months and discovered that women who adapted their routine by cycle phase had 47% fewer breakouts.
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Opinion7 min read
Dermatologists Ignore Your Cycle. That's Why Your Skin Routine Fails.
91% of dermatologists don't ask about your menstrual cycle when treating acne. That's a systemic failure — and it's costing you clear skin.
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Guides8 min read
Hormonal Acne: When It Happens and Why (By Cycle Day)
If you break out at the same time every month, your acne is hormonal. Here's a day-by-day breakdown of what happens to your skin, when, and what to do about it.
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