KDP categories · Top KDP authors
Endocrine System (Diseases & Physical Ailments, Books): Amazon KDP category data
Amazon Books Best Sellers data for Endocrine System (Diseases & Physical Ailments, Books), updated Nov 2, 2026: median price $15.99, median 142 reviews, average rating 4.6 and a KDPTop opportunity score of 33/100 (highly competitive).
| Price range (middle 50%) | $12.71 – $19.93 |
|---|---|
| Average rating | 4.6 |
| New releases (90 days) | 13% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 6% of the parent category Diseases & Physical Ailments (2,378), one of the easier corners under it.
Top 10 Endocrine System best sellers
-
Fast Like a Girl: A Woman's Guide to Using the Healing Power of Fasting to Burn Fat, Boost Energy, and Balance Hormones
by Dr. Mindy Pelz
- List rank#1
- Price$13.49
- Rating4.7
- Reviews8,678
-
The Liver Cure: Natural Solutions for Liver Health to Target Symptoms of Fatty Liver Disease, Autoimmune Diseases, Diabetes, Inflammation, Stress & Fatigue, Skin Conditions, and Many More
- List rank#2
- Price$15.48
- Rating4.5
- Reviews1,224
-
Metabolic Freedom: A 30-Day Guide to Restore Your Metabolism, Heal Hormones & Burn Fat
by Ben Azadi
- List rank#3
- Price$17.08
- Rating4.7
- Reviews1,350
-
Hashimoto's Protocol: A Groundbreaking Prescription to Reverse Symptoms, Heal Autoimmune Damage, and Reclaim Your Life with Personalized Detox Plans, Nourishing Recipes, and Proven Treatment
- List rank#4
- Price$16.39
- Rating4.6
- Reviews4,494
-
Medical Medium Thyroid Healing: The Truth behind Hashimoto's, Graves', Insomnia, Hypothyroidism, Thyroid Nodules & Epstein-Barr
- List rank#5
- Price$11.70
- Rating4.6
- Reviews11,021
-
The Thyroid Fix: The No-Nonsense Guide to Fix Fatigue, Fogginess, and Fat That Won't Budge
by Dr. Amie Hornaman
- List rank#6
- Price$18.86
- Rating4.8
- Reviews133
-
Wheat Belly (Revised and Expanded Edition): Lose the Wheat, Lose the Weight, and Find Your Path Back to Health
- List rank#7
- Price$11.16
- Rating4.6
- Reviews2,256
-
The Plant Paradox Quick and Easy: The 30-Day Plan to Lose Weight, Feel Great, and Live Lectin-Free ― A Gut Health Cookbook with Keto and Vegan Meals
- List rank#8
- Price$11.59
- Rating4.3
- Reviews11,341
-
Hashimoto's Thyroiditis: Lifestyle Interventions for Finding and Treating the Root Cause
- List rank#9
- Price$23.40
- Rating4.7
- Reviews3,827
-
The Menopause Moment: Mindset, Hormones and Science for Optimal Longevity
by Kelly Casperson M.D.
- List rank#10
- Price$22.06
- Rating4.8
- Reviews321
Same niche in Kindle eBooks: Endocrine System
FAQ
Is Endocrine System a good niche for Amazon KDP?
Its KDPTop opportunity score is 33/100, which makes it highly competitive. The median best seller has 142 reviews and sells for $15.99.
How many reviews do you need to rank in Endocrine System?
The median best seller has 142 reviews, and 44% of them have fewer than 100.
What do Endocrine System best sellers cost?
The median price is $15.99; half of the best sellers are priced between $12.71 and $19.93.
Can new books break into Endocrine System?
13% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.