Meet Your Provider 

Derek Lambert – Provider

Derek Lambert is a board certified provider and a member of the American Academy of Anti Aging. He has been a hormone specialist since 2015 and exclusively treats women in the peri menopause and menopause phase of life. Derek’s approach to treating women’s hormones is very simple… He states, “One size does not fit all when it comes to women and hormones”. Derek’s approach is very individualized with each patient. What brings women into the office is very different from patient to patient. 

Derek takes great pride in identifying what specifically brings each of his patients into the office and works in alleviating those symptoms. Derek has treated many women with his individualized approach using bio identical hormone replacement. There are over 400 functions of estrogen in the body; many of those functions are not objectively noticeable to patients. One of the functions is brain health. Personal experiences with Alzheimer’s and dementia made estrogen replacement in women a passion for Derek. There is a strong link between lack of estrogen and dementia in women. 

Derek likes to sit and talk to his patients and help them understand the importance of hormone replacement therapy. He debunks some of the myths associated with hormone replacement therapy and helps you understand WHY your primary care doctors or OBGYN’s might not check your hormone levels. One of Derek’s favorite quotes is, “There is no need for women to live with hot flashes, night sweats, insomnia, brain fog and irritability! The solution is not putting women on antidepressants, but rather giving them estrogen! As the decline of estrogen is what is CAUSING these symptoms!” 

Derek has authored a book, “Harmony in Hormones: A Comprehensive Guide to Menopause Treatment”; he wrote this book as an educational guide for women going through menopause and experiencing menopause symptoms. In Derek’s free time he likes spending time with his family (wife and 2 daughters), traveling and spending time outdoors. He likes to say, “You get one life… live it!.”

Meet The Team

Shelby Rudolph, RN

Clinical Director

Shelby Rudolph is our Clinical Director and a Registered Nurse who has been an integral part of our team since 2019. With extensive knowledge of both patient care and clinic operations, Shelby truly understands the ins and outs of the practice and helps ensure everything runs smoothly behind the scenes. She is known for her friendly, approachable demeanor and her ability to make patients feel comfortable and cared for. Outside of work, Shelby enjoys hiking and staying active, which reflects her passion for overall wellness.

Danielle Frentz

Office Manager

Danielle Frentz has served as our Office Manager since 2019 and plays a key role in keeping our front office organized and efficient. She oversees all administrative operations, including patient scheduling, front-office coordination, and daily workflow management. Danielle is detail-oriented, reliable, and dedicated to creating a seamless experience for both patients and staff. Originally from California, she brings a positive energy and strong organizational skills to our team.

Erin Capellupo, NP

Nurse Practitioner

Erin Capellupo is a Nurse Practitioner who has been with our practice for the past two years. She is highly experienced in weight loss therapy, peptide therapy, and testosterone replacement therapy, and takes a thoughtful, patient-centered approach to care. Erin is known for her down-to-earth personality and her ability to connect easily with patients, making them feel heard and supported. Her compassionate style and clinical expertise make her a favorite among patients.

Rachael Blomberg, RN

Registered Nurse

Rachael Blomberg is a Registered Nurse who has been part of our team for two years. She is well-versed in testosterone replacement therapy, weight loss treatments, and hormone replacement therapy for women. Rachael is known for her calm, steady demeanor and approachable personality—nothing ever seems to rattle her. Patients appreciate her relaxed, reassuring presence and her commitment to providing consistent, high-quality care.

Resources

Harmony in Hormones is a book that describes the process of hormone replacement therapy in women who are in the perimenopause or menopause phase of life. This book highlights the benefits of hormone replacement therapy and why estrogen, progesterone and testosterone are so beneficial to the female body. 

Buy the book off Amazon via the button below! 

Our Sister Companies

In addition to women’s health services, our clinical team collaborates with trusted specialty practices within our organization to ensure patients have access to comprehensive care when needed.

For patients seeking men’s health services, medically supervised weight management, or non-surgical joint care, referrals may be coordinated through our affiliated clinics:

These clinics represent distinct areas of clinical focus within our organization, allowing patients to access coordinated care across multiple specialties while maintaining a consistent standard of medical oversight, clinical quality, and patient experience.

Schedule An Appointment Today

We look forward to helping you feel like the best version of yourself. Please take a moment to fill out our contact form, and your offices will call you for scheduling.

Using Your Health Insurance

At US Women's Medical Center we accept all health insurance for our hormone therapy treatment services. In most cases you are able to use your health insurance in order to pay for treatment. This depends on many factors such as copays, deductibles and your specific health insurance provider. We do a in-depth insurance verification process that will allow patients to know specifically what their out-of-pocket costs are, if any. 

At the time of your first appointment, we start the insurance verification process. When you come back to review your lab work, we have all the information we need to let you know what insurance will cover, and if you would have ANY out-of-pocket expense.

FAQS About Hormone Replacement Therapy in St. Louis