If Your Blood Vessels Stay Young, Your Healthy Lifespan Extends
Gentosha Publishing
12,000 copies sold
Advancing healthy longevity and beauty science — Dr. Hikaru Ishii, MD, PhD
An ECM-based approach grounded in natural fish skin collagen research
Extend healthy lifespan,support lasting beauty.
Dr.JAPAN focuses on extracellular matrix (ECM) health, supporting vibrant living through clinical research on natural fish skin collagen and evidence-based supplement development.
New Launch · Limited Quantity
30 years of Dr. Ishii’s collagen research, realized
Decolla
Beauty and health are two sides of the same coin.
Everyone wants to feel beautiful. Everyone wants to stay healthy.
After three decades pursuing both wishes, Dr. Ishii arrived at the Ishii Theory: beauty and health are inseparable.
From that theory and research comes Decolla — a collagen supplement designed for women.
Limited launch from late August
Thirty years of collagen research in one formula.
Planned price ¥6,000 (excl. tax)
28 sachets
No hormone-like ingredients
Quality designed for daily, confident use
What is Decolla?
Not just a catchy name. Decolla is a high-quality collagen supplement for women, developed from Dr. Ishii’s 30 years of collagen research — including European patent technology and peer-reviewed academic publications.
Key ingredients
- Premium, high-dose natural cod skin collagen
- Premium, high-dose elastin from bonito arterial bulb
- Calcium
A carefully balanced formula to support daily beauty and wellness nutrition.
The men’s sister product Dr.Energy is available via Alter membership sales.
What's New
- 2026/06/05Notice
- Clinical information has been added to our website.
- 2025/01/29Notice
- Our website has launched.
About Dr.JAPAN
Dr.JAPAN Co., Ltd. is dedicated to advancing healthy longevity and beauty science through rigorous clinical research on natural fish skin collagen.
Our founder, Dr. Hikaru Ishii, brings over 54 years of clinical experience, including a European patent for collagen-based vascular health, 17 years of NK cell immunotherapy (634 cases), and more than 50,000 gastrointestinal endoscopic procedures.
Guided by the hypothesis that healthy longevity and beauty share the same biological foundation — the extracellular matrix (ECM) — we develop evidence-based supplements for people worldwide.
Publications by Dr. Hikaru Ishii
About our publications and sales figures
The Lies of Doctors
Gentosha Publishing
120,000 copies sold
The Doctor's Crime and Punishment
Gentosha Publishing
8,000 copies sold
ANK
Immune Cell Therapy When Diagnosed with Cancer
Gentosha Publishing
8,500 copies sold