Smiling friends sitting in a gym after working out

Energize Testosterone & Wellness Center

Aesthetic, Functional, Integrative, Anti-Aging and Regenerative Medicine located in O’fallon, MO

Schedule a consultation

Group of people doing core exercise on fitness mat outdoors. Athletic group training together in the city.

Aesthetic, Functional, Integrative, Anti-Aging and Regenerative Medicine located in O’fallon, MO

Schedule a consultation

Energize Testosterone & Wellness Center

Aesthetic, Functional, Integrative, Anti-Aging and Regenerative Medicine located in O’fallon, MO

Schedule a consultation

Energize Testosterone & Wellness Center

Aesthetic, Functional, Integrative, Anti-Aging and Regenerative Medicine located in O’fallon, MO

Schedule a consultation

Senior couple admiring the scenic Pacific coast while hiking, filled with wonder at the beauty of nature during their active retirement

Energize Testosterone & Wellness Center

Aesthetic, Functional, Integrative, Anti-Aging and Regenerative Medicine located in O’fallon, MO

Schedule a consultation

How can we help?

Trust in our medically superior, individualized approach to fixing the body at a cellular level. We focus on prevention and detection of chronic, age-related diseases by using modern medical practices to optimize your wellbeing.

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About Energize Testosterone & Wellness Center

Energize Testosterone & Wellness Center is a functional and integrative practice welcoming men and women for personalized care in O’Fallon, Missouri. Nurse practitioner and founder Jennifer McElfresh, MSN, APN-BC, compassionately listens to every patient’s needs in order to tailor their care plans accordingly. Through years of experience, she’s learned the value of care individualization and a close patient/provider relationship.

Jennifer began her medical career at age 18 as a hospital corpsman in the United States Navy. She then attended Saint Louis University in St. Louis, Missouri, for her bachelor’s degree, physician assistant studies, and accelerated nursing program. She later earned her master’s degree from Maryville University in Town and Country, Missouri, before serving an additional sixteen years in the United States Air Force.

Today, Jennifer enjoys using her skills to better the lives of her patients at Energize Testosterone & Wellness Center. Her specialties include hormone replacement therapy and bioidentical testosterone replacement therapy, erectile dysfunction treatment, and weight loss with semaglutide.

Jennifer also proudly provides an array of confidence-boosting aesthetic procedures, including high-class injectables like Botox® and reinvigorating dermal fillers. Aesthetic procedures are all nonsurgical and available to most people interested in enhancing their appearances.

Call Energize Testosterone & Wellness Center or book a visit online to explore wellness and aesthetics services today.

Our Services

Custom Treatment Plans for Men & Women

Testosterone Replacement Therapy

Erectile Dysfunction

Medical Weight Loss

Hormone Replacement Therapy

Botox

IV Vitamin Therapy

Dermal Fillers

Aesthetics

About your providers

Anti-Aging Specialists

Nurse Practitioner Jennifer McElfresh, founder of Energize Wellness Center, started her medical career at the age of 18 in the United States Navy as an Hospital Corpsman. Jennifer attended Saint Louis University for her Bachelor’s in Biology, Physician Assistant studies, and the Accelerated Nursing Program. She attended Maryville University for her Master’s Degree and after completing her studies got a direct commissioning in the United States Air Force where she served an additional sixteen years.

Normal is NOT Optimal

Outdoor closeup portrait of handsome freckled smiling male with curly hair

Never Surrender to Time

25% of men over 30 years old are secretly suffering due to non-optimal health conditions. Our mission is to equip you with the tools to take control of your health. By offering bespoke testosterone therapy plans, medical weight loss options, erectile dysfunction treatments, and other ancillary services that are meticulously crafted to align with your unique needs and goals, we put the power of wellness into your hands.

A New Approach to Aging

Our goal is to give you the reins to regain your youthful vitality while you age with grace. We provide custom-tailored hormone replacement therapy plans, medical weight loss options, vitamin based IV therapy, and Botox/dermal fillers to reduce the presence of lines, all designed to meet your unique needs and objectives, empowering you to take command

of your everlasting well-being.

Too busy for botox?

Your Personal Health Optimization Concierge

Try Concierge treatments with Nurse Jenn! Perfect for busy, on-the-go patients who need treatment outside of normal business hours!

Schedule consultation now

Patients Reviews

What Our Clients Say

"Highly recommend Jennifer! Her and Tina are both wonderful in making you comfortable and feel like their #1 priority. Great pricing too. Pleased with my Botox results. Her new clinic is beautiful & clean . Love the complementary massage chair!"

Rebecca Meier

"Did some bloodwork at Energize and it was an amazing experience! Once my results came back, Jenn reached out and we went over everything in great detail. I learned a lot about myself and she helped me put a gameplan together moving forward. Highly recommend!!"

Andrew Helbig

"This is the best Testosterone facility in the city. The office and the staff are amazing!! Jennifer and Tina are always friendly, knowledgeable, and AWESOME to work with and I am reaching my goals much faster than I ever anticipated!"

Derek Hogue