About
Sara G. Allison: The Original Harley Street Trichologist
I’m Sara G. Allison — author of How to Keep Your Hair On… the ULTIMATE Guide for Women, a Registered General Nurse, and a world-leading trichologist specialising in natural hair regrowth for both men and women.
My work brings together medical and clinical training, women’s health expertise, and a whole-body approach to wellness so clients can understand why their hair is changing — and how to improve it from the inside out.
I’m also an advocate of gentle, science-led biohacking, with a particular focus on anti-ageing and longevity, helping clients support their internal health so their hair, skin, and energy reflect that improvement.
Who We Are
Early Career In Medical & Clinical Nursing
I began my career with medical and clinical training as a Registered General Nurse, completing my training in London hospitals. Those early years gave me deep insight into systemic illness, recovery, and the profound link between internal health and outward appearance – an understanding that still shapes every consultation I deliver.
Specialising in Women’s Health
I later took on specialist roles at Queen Charlotte’s and Chelsea Hospital, progressing to a senior nursing position at the Elizabeth Garrett Anderson Hospital for Women. During this time, I gained qualifications in reproductive and sexual health, expanding my understanding of hormonal conditions and how internal imbalances often reveal themselves through the hair and skin.
Although this part of my career focused on female health, the underlying principles apply to both men and women, and they now underpin my functional approach to trichology.
“When you support the body, the hair responds”
Sara G. Allison
Founder, Trichologist
Why Choose Us
Beginning Trichology – and Juggling a Dual Career
In 1996, I began my formal trichology training, completing the three-year programme and becoming a Registrant of the Institute of Trichologists (RIT). For many years, I worked a dual career, practising as both: a trichologist and a senior nurse in advanced clinical roles. This included positions as
– Senior Nurse Advisor for NHS Direct
– Nurse Practitioner in general practice associated with University College London
Balancing two professions gave me a rare, comprehensive understanding of how nutrition, hormones, stress physiology, gut health, inflammation, sleep, and lifestyle affect the whole body — and how these internal factors become visible through changes in the hair.
Why Choose Us
Focusing Fully On Trichology – Nutrition, Biohacking & Product Development
By 2006, I stepped away from nursing to focus entirely on trichology, opening my Harley Street practice. At the same time, I began ongoing nutrition studies and deeper work in wellness, anti-ageing, and longevity, recognising how closely internal health determines hair growth, skin quality, and long-term vitality.
This marked the beginning of another dual-track chapter, balancing:
– clinical trichology
– continuous nutritional and functional-health education
– evidence-based biohacking protocols
– the ongoing development of my own formulations
Our Products
My product development remains an active, evolving process. Years of research, formulation, and refinement with specialist scientists led to my award-winning product range, created specifically for my clients and designed to support:
– regular, natural hair regrowth
– stronger, shinier hair
– clearer, more refined skin
– healthier nails
– broader anti-ageing and longevity benefits through improved internal balance
A Wellness-Led, Root-Cause Approach
My work follows one guiding principle:
When you support the body, the hair responds.
Hair loss rarely occurs in isolation.
It reflects deeper internal patterns – nutrient levels, thyroid and hormonal balance, gut health, inflammation, stress, sleep, and lifestyle.
By addressing these root causes, I help clients improve not only their hair, but their overall health, resilience, and long-term longevity. This approach supports men and women equally, and it forms the foundation of every treatment plan I deliver.
My expertise is regularly featured in the UK media, and I work with individuals, journalists, clinics, and global companies seeking accurate, science-based trichological guidance.
Consultations Across The UK
– Berkshire
– Essex
– London
– Liverpool
– Scotland
– Video for those unable to attend in person:
Every consultation is carried out personally by me, providing tailored guidance, a clear plan, and a holistic approach that supports natural hair regrowth, internal health, anti-ageing, and long-term wellbeing.
HAIR TODAY MORE TOMORROW
Get In Touch
Location
10 Harley Street, Marylebone, London, W1G 9PF
Phone
+44 7557 645217
+44 207 299 0383