John Mark Joyce, MD

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Date Published: 07/22/2026

John Mark Joyce, MD

Dr. John Mark Joyce has been a Principal Investigator at the Jacksonville clinic since 2003. He has participated in over 400 Pediatric, Adolescent, Adult, and Geriatric Ph II – IV clinical trials including Psychiatry, Neurology, Women’s Health, Pain, Addictions, Vaccine, Dermatology, GI, Sleep, Diabetes and Obesity.

Dr. Joyce also holds a Schedule I license and has been on the forefront of psychedelic research and education in the Jacksonville area. Throughout his research career his contributions have been instrumental in bringing 108 new drugs to market and is frequently sought out by Sponsors for his high enrollment and clean, outstanding data quality. In his 22 years at CNS Healthcare, Dr. Joyce has successfully completed numerous FDA audits for high enrollment with no 483’s.

Although Board Certified in Psychiatry, Dr. Joyce’s passion is in Obesity and Metabolism. He has been an Investigator in numerous Diabetes, Obesity, Metabolic and Cardiovascular trials and likes to stay on top of the latest research findings.

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Alcohol Addiction
Alzheimer's Disease
Anxiety
Asthma
Atherosclerotic Cardiovascular Disease (ASCVD)/Coronary Artery Disease (CAD)
Atopic Dermatitis
Atrial Fibrillation
Attention-Deficit/Hyperactivity Disorder (ADHD)
Axial Spondyloarthritis
Back Pain
Binge Eating Disorder
Bipolar Disorder
Birth Control
C-Diff Vaccine
Cannabis Withdrawal
Chronic Kidney Failure/Disease
Chronic Obstructive Pulmonary Disease (COPD)
Chronic Pain
Congestive Heart Failure
Constipation
Contact Dermatitis
COVID-19 Infection
Dementia
Depression
Diabetic Foot Ulcer
Diabetic Neuropathy
Dyskinesia
Dystonia
Eczema
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Healthy Volunteer
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Hepatic Impairment
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Human metapneumovirus (HMPV)
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LSD & Psilocybin
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Menopause
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Multiple Sclerosis
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Pain Post-Chemo
Parkinson's Disease
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Pediatric Obesity
Pediatric Vaccine
Polycystic Ovary Syndrome (PCOS)
Post Traumatic Stress Disorder (PTSD)
Pre-Alzheimer's
Psoriasis
Psoriatic Arthritis
Respiratory Syncytial Virus (RSV)
Schizophrenia
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Social Anxiety Disorder
Smoking Cessation
Type 1 Diabetes
Type 2 Diabetes
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Vaccines
Vaccine- C.DIFF
Vaccine- COVID
Vaccine- Flu
Vaccine- Pneumonia
Vaccine- RSV
Vaccine- RSV/HMPV
Weight loss for Obesity

Acne
Alzheimer's Disease
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Asthma
Atherosclerotic Cardiovascular Disease (ASCVD)/Coronary Artery Disease (CAD)
Athlete's Foot
Atopic Dermatitis
Atrial Fibrillation
Attention Disorder Disorder/ADD/ADHS
Autism
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Binge Eating Disorder
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Cancer, Genitourinary (GU)
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Cancers, Blood
Cardiac Arrhythmias
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Chronic Kidney Failure/Disease
Chronic Obstructive Pulmonary Disease (COPD)
Chronic Pain
Cluster Headaches
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Congestive Heart Failure
Constipation
Contact Dermatitis
COVID-19 Infection
Crohn's Disease
Dementia, General
Depression
Diabetes
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Diastolic Dysfunction and Diastolic Heart Failure
Drug Allergies
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Dyskinesia
Eczema
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Essential Tremor (ET)
Fibromyalgia
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Gastroparesis
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Heart Failure
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Multiple Sclerosis
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Nonalcoholic Fatty Liver Disease (NFLD)
Nonalcoholic Steatohepatitis (NASH)/Metabolic Dysfunction-Associated Steatohepatisis (MASH)
Norovirus Infection
Opioid Addiction
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Osteoarthritis, General
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