The 40+ Female Biohacker Series10 Books on KindleFree with Kindle Unlimited Hormones & MetabolismSleep & StressBrain HealthMuscle & Fitness The 40+ Female Biohacker Series10 Books on KindleFree with Kindle Unlimited Hormones & MetabolismSleep & StressBrain HealthMuscle & Fitness
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📚 Complete 10-Book Series

The 40+ Female
Biohacker Series

Science-backed Kindle books written specifically for women over 40 — covering hormones, metabolism, sleep, muscle health, brain function, and more. Written by Hiral Prajapati.

📱 Kindle Edition
✅ Free with Kindle Unlimited
⚡ Available Instantly
🇨🇦 Available on Amazon Canada
Browse All 10 Books ↓
Jump to: Book 1 — Metabolic Book 2 — Sleep Book 3 — Protein Book 4 — Hormones Book 5 — Brain Fog Book 6 — Circadian Book 7 — Muscle Book 8 — Tech-Neck Book 9 — GLP-1 Book 10 — HRV
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Author
Hiral Prajapati

Hiral Prajapati is the author of The 40+ Female Biohacker Series — a 10-book collection of practical, science-backed guides written specifically for women navigating the physical and hormonal changes that come with life after 40. Each book breaks down complex health topics into clear, actionable strategies so you can take control of your metabolism, sleep, brain health, and body — without extremes or gimmicks.

The Complete Series

All 10 Books

Each book stands alone — read in order or start with whichever topic matters most to you right now. All available on Kindle and free with Kindle Unlimited.

Book 2 of 10
Kindle Unlimited
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The Tired-But-Wired Loop
Book 2 — Sleep & Stress
The Tired-But-Wired Loop: Breaking the Cortisol Cycle That's Stealing Your Sleep
Why you're exhausted but can't sleep — and the cortisol patterns keeping you stuck in the cycle. Practical strategies to reset your nervous system and reclaim deep, restorative sleep.
Cortisol Sleep Quality Stress Reset
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Book 3 of 10
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💪
Protein Resistance
Book 3 — Protein & Muscle
Protein Resistance: Why 20g Doesn't Work Anymore & How to Fix It with Protein Pacing
After 40, your muscles become resistant to protein signals. This book explains why and introduces protein pacing — the strategy that actually rebuilds and preserves lean muscle.
Protein Pacing Muscle Mass Nutrition
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Book 4 of 10
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The Invisible Perimenopause
Book 4 — Hormones
The Invisible Perimenopause: Tracking Your Hormones When Everything Feels Unpredictable
A practical guide to understanding the hormonal chaos of perimenopause — what's happening in your body, how to track it, and how to respond with precision instead of panic.
Perimenopause Hormone Tracking Estrogen
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Book 5 of 10
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Brain Fog or Something More?
Book 5 — Brain Health
Brain Fog or Something More?: Cognitive Hacks to Stay Sharp, Focused & Fearless After 40
When you can't find words, lose your train of thought, or feel mentally slow — is it just aging? This book gives you the answers and the cognitive strategies to reclaim your sharp, focused mind.
Brain Fog Cognitive Health Focus
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Book 6 of 10
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🌙
Circadian Reset
Book 6 — Light & Rhythms
Circadian Reset: Managing Light, Mood & Skin Through Your Body's Inner Clock
Your circadian rhythm controls far more than sleep — it governs mood, skin, metabolism, and hormones. This book teaches you how to work with your body's inner clock to feel dramatically better.
Circadian Rhythm Light Therapy Mood & Skin
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Book 7 of 10
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🏋️‍♀️
Sarcopenia
Book 7 — Muscle & Strength
Sarcopenia: Protecting Your Muscle, Metabolism & Independence After 40
Muscle loss after 40 is silent, progressive, and dangerous — but entirely preventable. This book shows you exactly how to protect and rebuild lean muscle mass to stay strong, independent, and metabolically healthy.
Sarcopenia Strength Training Metabolism
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Book 8 of 10
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Tech-Neck & Pelvic Floor
Book 8 — Body & Posture
Tech-Neck & Pelvic Floor: Physical Biohacks for Desk-Bound Women Who Want to Avoid Surgery
The posture problems, pelvic floor dysfunction, and chronic tension that come from desk-bound modern life — and the practical biohacks that fix them without surgery or expensive physio.
Tech-Neck Pelvic Floor Posture
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Book 9 of 10
Kindle Unlimited
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GLP-1 & Muscle Loss
Book 9 — GLP-1 & Medication
GLP-1 & Muscle Loss: Biohacking Bone Density & Strength While on Weight-Loss Medications
GLP-1 medications like Ozempic and Wegovy can cause significant muscle and bone loss. This book shows you how to protect your strength and density while navigating weight-loss medication safely.
GLP-1 Bone Density Ozempic
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Book 10 of 10
Kindle Unlimited
⌚
HRV Decoded
Book 10 — Recovery & Data
HRV Decoded: How to Actually Use Your Oura or Apple Watch to Optimize Recovery
Heart Rate Variability is the most powerful health metric most women ignore. This book decodes what your Oura Ring or Apple Watch is really telling you — and how to use that data to train smarter and recover faster.
HRV Oura Ring Recovery
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📚 Read All 10 Books Free

Every book in the series is available free with a Kindle Unlimited membership. If you don't have KU yet, you can start a 30-day free trial and read the entire series at no cost.

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