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MOSAIC Medicine

About Us

Welcome to MOSAIC Medicine, your trusted holistic medicine clinic in Rapid City, SD, serving the surrounding areas with personalized, integrative care. Our holistic medicine practitioners create a customized “mosaic” for every patient—blending evidence-informed therapies with whole-person support to help you feel your best from the inside out.

We specialize in women’s health, hormone balancing, gut health optimization, and weight loss management services designed to fit your life. Whether you’re looking for sustainable weight loss, structured weight loss management, or advanced options such as peptide injections—including BPC injections and GLP injections—our team partners with you to build a clear, supportive plan focused on your goals, your biology, and your long-term wellness.

Areas Served

Rapid City, SD | Hill City, SD | Spearfish, SD

What We Offer

Our Specialties include:

Our Services include:

Our Brands include:

Testimonials

On 3/24/2026 Jenn Landis had this to say:
Dr. Alexia Gillen is a phenomenal physician. I was recommended to her during a time of extreme discomfort. I was having temperature regulation issues, sleep issues, and severe brain fog. She was compassionate, comprehensive, and truly cared about getting my health back on track. I’m happy to say that just 2 months later, my symptoms are gone and I’m back to feeling like myself again! It may not sound like much, but I had been living in misery for more than 6 months and didn’t think I’d ever feel “normal” again. Dr. Gillen listened, understood, and was able to quickly turn things around for me. I can’t recommend her highly enough.

On 3/21/2026 Camille Martin had this to say:
I am so grateful for Dr Alexia Gillen. She took time to listen to me and didn’t dismiss me or try to get me to fit in a neat box that she was comfortable with. She ran extensive blood work and additional tests to see my entire health picture. She didn’t try and diagnose me based solely on her knowledge but waited for tests results to provide an accurate diagnosis. I finally have answers after years of chronic fatigue, body aches, brain fog, headaches, and more. I have met with extensive doctors, I even met with someone from Functional Medicine at Mayo and he sent me home with books on.dealing chronic fatigue without running a single test. Now I know the source of my problems and can be healed and live life again. Dr Gillen has given me hope. I cannot thank her enough for that. 💛

On 3/21/2026 Jami Gropper had this to say:
I have loved the care I’ve gotten at Mosaic! Dr. Gillen is so kind and caring, and listens to what you are saying . She digs deeper and goes beyond just what the blood work says and I haven’t felt better in years! I’m down 15 pounds and have more energy than I’ve had in a long time!

On 12/18/2025 Rick Kahler had this to say:
I appreciate Dr. G’s ability to deeply listen and prescribe solutions that address my needs.

On 12/10/2025 Jill Voorhees had this to say:
I started seeing Dr. Gillen about half a year ago. After being sick of what our normal health care system does for people who are struggling, but aren’t sick by their superficial metrics a friend told me about Mosaic. I am happy I made the change. My first appointment I felt seen and cared for and felt similar feelings every appointment I’ve had after that. I am forever grateful for Dr. Gillen.

Contact Us

MOSAIC Medicine
2800 Jackson Blvd Suite 2 Rapid City, SD 57702
Phone: (605) 503-7020
Email: alexia.gillen@gmail.com

Where To Find Us

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Payment Types Accepted

American Express, Personal Checks, Debit Cards, Discover, MasterCard, Visa, Zelle

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 9:30 AM - 5:00 PM
Tuesday: 9:30 AM - 5:00 PM
Wednesday: 9:30 AM - 5:00 PM
Thursday: 9:30 AM - 5:00 PM
Friday: By Appointment Only
Saturday: By Appointment Only

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