Functional & Integrative Medicine

Modern Medicine Clinic & Healing Provisions Holistic Medical Clinic

At Modern Medicine we value our patients and working alongside them to help them get to the root cause of their symptoms, giving them the help they need to get to their optimal health and feel like their most vibrant selves.


Functional and integrative medicine practitioners can help address a variety of health concerns, including:

  • Precise and effective treatment of complex thyroid disorders
  • Hashimoto’s
  • Hormone balancing & bio-identical hormone replacement for both men and women
  • Food allergy testing
  • ADD/ADHD
  • Autism Spectrum Disorders
  • Weight management
  • Autoimmune conditions
  • Fatigue
  • Pregnancy preparation or difficulties
  • Adrenal issues
  • Chronic Inflammation
  • Gastrointestinal Issues

Functional & Integrative Medicine Practitioners

McCall McPherson PA-C
Integrative & Functional Medicine Practitioner

Hi, I’m McCall McPherson, you can find more about my academic accomplishments below, but I thought I’d start with the more interesting stuff. You can a more in-depth understanding of who I am and how I practice on my website at www.mccallmcpherson.com.

I ended up in this fascinating niche of medicine for a few reasons. Probably the most profound was my own health problem, hypothyroidism that I simply could not get managed and it left me almost non-functional for about 6 months. It wasn’t until I found an integrative physician to truly sort it out that I got my life back. The other was spending a few years practicing traditional psychiatry. I started noticing many of my patients really had underlying physiological conditions that were causing or contributing to their mental health struggles. Many of which weren’t traditionally being screened for. At some point in this practice, I picked up my train and put it on a different set of tracks, so to speak, and began my pursuit of integrative and functional psychiatry. As years passed I’ve expanded my practice to include treatment of a full scope of functional medicine. I now frequently treat gut disruption, fatigue, hormonal issues including hormone replacement for both females and males, and chronic health struggles that have been unresolved in traditional medicine-to mention a few. Of course, I continue to be deeply passionate about absolutely optimal thyroid management and integrative psychiatry.

I’m a licensed and nationally certified Physician Assistant with prescriptive authority. I graduated Magna Cum Laude with a Bachelors Degree from Texas State University in Psychology in San Marcos, Texas. I then packed up my bags and moved to New York City to earn a Master’s Degree as well as an additional Bachelor’s degree in Physician Assistant Studies at Mercy. I’ve received training through numerous IMMH (Integrative Medicine for Mental Health) conferences and mentorships and began my certification from the prestigious Institute for Functional Medicine in 2015.

Visit Modern Medicine’s website to book an appointment with McCall.


Barry Smeltzer MPAS, PA-C
Integrative & Functional Medicine Practitioner

Barry Smeltzer

Barry is a Holistic Practitioner who specializes in biomedical and environmental medicine interventions to assist the body in the healing process. He has dedicated his career to healing children and families after his own son was diagnosed with multiple medical conditions, from which all he has significantly improved.

Barry has a Masters in Physician Assistant studies from Finch University/Chicago Medical School and has been certified as a Defeat Autism Now clinician. He has several published articles in The Autism File and Autism Science Digest. He has presented across the country for organizations such as TACA, Holistic Mom’s Network, National Autism Association and Autism One. Barry has also spoken for local organizations – the San Antonio Natural Parenting group and Any Baby Can San Antonio.

Barry enjoys spending time with his family and friends camping, biking, homesteading, reading and visiting our local farmer’s markets. He is happily married to his wife of 15 years, Linda, and is the father of five wonderful children. He also enjoys sports, like golf, football, and hockey. The Minnesota Vikings and Chicago Blackhawks being his favorites!

Visit the Healing Provisions website to book an appointment with Barry.