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Functional Medicine vs Longevity Medicine: What’s the Difference?

Explore the best holistic doctor platforms for personalized, whole-body care, including Parsley Health’s root-cause approach and insurance-covered care.

Best Holistic Doctors: Top Platforms for Personalized, Whole-Body Care

The signs of autoimmune disease may depend on the organ that is affected. Some of the common signs may include redness, swelling, and diarrhea. 

5 Early Warning Signs of Autoimmune Disease

Parsley Health, the leading functional medicine telehealth provider, is now in-network nationwide through insurance with Aetna, Cigna, UnitedHealthcare, and more.

Parsley Health Becomes the First Functional Medicine Provider to Accept Insurance Nationwide

Battling symptoms of fatigue, brain fog, anxiety, muscle cramping, and more, but can’t find the source? Learn how Parsley Health uncovered mold toxicity in one patient with these symptoms.

How We Discovered Jenn's Mold Toxicity

Told you have IBS? Melissa’s lifelong gut issues turned out to be SIBO. See how Parsley Health used advanced testing and personalized care to uncover the real cause.

How Melissa Realized Her IBS Was Actually SIBO 

How To Read Your Bloodwork Like a Longevity Doctor

Learn the common causes and symptoms of vitamin B12 deficiency, how it’s diagnosed, and treatment options to discuss with a clinician.

Vitamin B12 Deficiency: Causes, Symptoms, and Treatment

Learn what low ferritin levels can mean, common causes of low iron stores, symptoms to watch for, and when to talk with a clinician.

Why Are My Ferritin Levels Low? Low Ferritin Causes

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Explore root-cause health, nutrition tips, and functional medicine insights from experts.

Parsley Health Blog

Can Functional Medicine Help With Anxiety?

Is a Hair Mineral Analysis Test Worth It? What It Can Actually Reveal About Your Health

Parsley Health physician-led functional medicine now accepting insurance nationwide

Physician-led, root-cause care is now in-network for 150 million Americans through health insurance plans in all 50 statesParsley Health was the first telehealth provider to offer functional medicine nationwide, and is now the first to offer it through the mainstream healthcare insurance system. Starting today, Parsley's physician-led, root-cause care is available nationwide through in-network insurance plans, expanding access to 150 million people through their existing health insurance benefits.Parsley now accepts hundreds of major insurance plans, including Aetna, Cigna, UnitedHealthcare, BlueCross BlueShield, Humana, and Centene. Insurance may cover eligible medical costs such as provider visits, diagnostic testing, and clinician-directed prescriptions. This milestone reflects a cultural shift in demand for more personalized, comprehensive, integrated medicine."When I founded Parsley Health a decade ago, my mission was to make high-quality, evidence-based functional medicine and longevity care accessible to everyone. So, going in-network nationwide was the ultimate goal — and I'm proud that Parsley is the first to make this a reality," said Dr. Robin Berzin, Founder and CEO of Parsley Health. "Functional medicine has historically been expensive, elusive, and inconsistent. Parsley has solved all three. We're giving millions of people easy access to care that both treats complex conditions sustainably and optimizes their health over time."Parsley first introduced in-network coverage in New York in 2023 through a partnership with Mount Sinai Hospital, followed by an expansion in California. Today's nationwide rollout represents a significant step towards making proactive, preventative medicine the default option in our nation's healthcare system.<h2>The case for root-cause functional medicine</h2>Today, 3 in 4 American adults live with at least one chronic condition, and more than 4 in 10 with two or more. Chronic disease now accounts for 90% of the nation's $4.9 trillion in annual healthcare spending.¹ This shows how the traditional healthcare system was built to manage symptoms and handle acute care, rather than address underlying causes at the root and optimize for long-term health.As a result, consumers have increasingly sought out alternative options: the global health and wellness economy now stands at $6.8 trillion and is projected to approach $9.8 trillion by 2029,² with 84% of U.S. consumers naming wellness a top or important priority.³ This has fueled the explosive growth of integrative and functional medicine — a U.S. market expected to grow from $28.65 billion to over $229 billion by 2033.⁴<h2>How in-network functional medicine works</h2>Parsley's care model was built to meet that need. Its board-certified clinicians, specially trained in functional medicine, take a systems-based approach to understand how interconnected factors — from hormones and metabolism to gut health and inflammation — contribute to conditions like fatigue, autoimmunity, metabolic syndrome, infertility, and GI dysfunction. The results are measurable with 89% of Parsley members reporting significant symptom improvement or complete resolution within their first year of care, based on the Parsley Symptom Index, a proprietary outcomes tool developed in alignment with FDA guidelines and validated in peer-reviewed research.With insurance serving to offset or cover eligible medical costs, program fees are also reduced to $150/month (or $1,500 if paid annually), which supports Parsley's full experience: a dedicated five-person care team — including a board-certified clinician, functional medicine nutrition coach, and RN care coordinator — clinical interpretation of lab testing and diagnostics, access to specialty testing, five provider visits annually, integrated progress tracking, ongoing support, and more. Typical out-of-pocket costs for comparable functional or concierge medicine can range from $500-1,500+ for a single visit with annual programs ranging from $5,000 to $20,000+. Parsley has solved for both the rushed, reactive, and fragmented constraints of conventional medicine and the expensive, inaccessible, out-of-network model of other options.<a href="https://www.parsleyhealth.com/join/care" rel="noopener noreferrer" target="_blank">Verify your insurance and join today.</a>Learn more about how Parsley’s <a href="http://parsleyhealth.com/care" rel="noopener noreferrer" target="_blank">Complete Care program</a> and <a href="https://www.parsleyhealth.com/insurance" rel="noopener noreferrer" target="_blank">insurance coverage</a> works. CITATIONS<ol><li>Centers for Disease Control and Prevention. About chronic diseases. Updated March 4, 2025. <a href="https://www.cdc.gov/chronic-disease/about/index.html" rel="noopener noreferrer" target="_blank">https://www.cdc.gov/chronic-disease/about/index.html</a></li><li>Global Wellness Institute. The global wellness economy hits a record $6.8 trillion and is forecast to reach $9.8 trillion by 2029. Published November 19, 2025. <a href="https://globalwellnessinstitute.org/press-room/statistics-and-facts/" rel="noopener noreferrer" target="_blank">https://globalwellnessinstitute.org/press-room/statistics-and-facts/</a></li><li>Callaghan S, Doner H, Medalsy J, Pione A, Teichner W. The $2 trillion global wellness market gets a millennial and Gen Z glow-up. McKinsey &amp; Company. Published May 29, 2025. <a href="https://www.mckinsey.com/industries/consumer-packaged-goods/our-insights/future-of-wellness-trends" rel="noopener noreferrer" target="_blank">https://www.mckinsey.com/industries/consumer-packaged-goods/our-insights/future-of-wellness-trends</a></li><li>Nova One Advisor. U.S. complementary and alternative medicine market size to hit USD 229.12 billion by 2033. Published 2024. <a href="https://www.novaoneadvisor.com/report/us-complementary-and-alternative-medicine-market" rel="noopener noreferrer" target="_blank">https://www.novaoneadvisor.com/report/us-complementary-and-alternative-medicine-market</a></li></ol>

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Dry Throat: Causes, Symptoms, and Remedies

Macrocytic Anemia vs Megaloblastic Anemia: Differences, Symptoms, and What Is It

The Secret Link Between Autoimmune Disease and Diet

MS Symptoms in Women: Early Signs of Multiple Sclerosis and What to Watch For

Thyroiditis 101: A Patient’s Guide To Causes, Symptoms, Treatments

Early Signs of Diabetes in Women and Prevention Tips

Crohn's Disease Symptoms in Females: What You Need to Know

Can You Slow Down Aging? Science Says Yes

High Testosterone In Women: How To Lower Testosterone Naturally & Medically

Everything You Need To Know About Chronic Rhinitis

How the Autoimmune Paleo Diet Heals the Immune System

Acupuncture for Hormones: Does It Boost Fertility & Fix Imbalances?

Can Birth Control Cause Inflammation and Other Side Effects?

Hormonal Misfiring: 10 Signs You Have a Hormonal Imbalance

Lectins, Phytates, and Oxalates: What Are Antinutrients?

Can Stress Make You Sick? The Impact of Chronic Stress on Health

What Is a Functional Medicine Doctor?

What Causes Night Sweats in Women? 7 Causes of Nighttime Sweating | Parsley Health

How To Relieve Fibroid Pain Naturally Without Surgery

Why Am I Still Tired After 8 Hours of Sleep? Common Causes & Remedies

6 Reasons You Feel Bloated All the Time—and What to Do About It

Can Omega 3 Cause Acne? Fish Oil For Breakouts and Skin Health

How Does Exercise Affect Female Hormones? 

High Estrogen: Here’s How to Treat Estrogen Dominance

How To Stop Sugar Cravings For Good: 5 Effective Ways

Adrenal Fatigue Treatment: Regaining Your Energy

Does Inflammation Cause Weight Gain?

The Ultimate Post-Workout Recovery Guide

How to Regulate Your Period Naturally: Causes of Irregularity & Home Remedies

CYP1A2 Caffeine Gene: Are You a CYP1A2 Ultrarapid Metabolizer?

Can Allergies Cause Fatigue? What To Know and How To Cope

Best Vitamins and Supplements for Thyroid Health

Gut Health and Acne: Things To Know and What To Do

Diverticulitis Diet: Foods to Eat & Foods to Avoid During A Diverticulitis Flare-Up

Top 20 Anti-Inflammatory Foods: The Best Anti-Inflammatory Diet Foods List

SIBO Symptoms: Signs of Small Intestinal Bacterial Overgrowth 

Basic Fatigue Management: How to Get Your Energy Back

Hypothyroidism vs Hyperthyroidism: Symptoms and Differences

The Ultimate Chronic Fatigue Explainer—and How to Cure It

How to Lower Cortisol Naturally: 11 Evidence-Based Strategies

Autoimmune Rash: Types, Causes, and Treatment Options

Cortisol Belly: What It Is and How To Get Rid of It

How To Increase Male Fertility and Sperm Count

Why Am I Tired All the Time? How Women Can Fight Fatigue

Fertility Diet Meal Plan: The Best Foods To Eat and What To Avoid

Omega-3 vs Omega-6 Fatty Acids: A Complete Comparison

How To Recover from Burnout: 6 Ways To Fight Stress

Biohacking for Women 101: 7 Ways To Get Started

Genetics and Health: What Percentage of Diseases Are Genetic?

What Happens To Your Body and Hormones After Miscarriage?

How To Prepare Your Body for Pregnancy: A 2-Year Guide

Weak Immune System Symptoms: 12 Signs Your Immune System Is Struggling

Can Low Iron Cause Anxiety and Depression? What Experts Say

Signs of Hormone Imbalance After Pregnancy—and How to Fix It

Does Magnesium Help With Bloating?

What Are Sleep Chronotypes? The 4 Sleep Types Explained

Think You Have A Food Allergy? It Could Be Histamine Intolerance

Eat to Beat Brain Fog: Foods to Try (and Avoid) to Support Cognitive Health

Your Painful Periods Aren't Normal: What to Know About Endometriosis

4 Quick, Delicious, and Health-Coach Approved Holiday Recipes

How to Find the Best (And Worst) Foods, Activities, and Sleep Habits for Sugar Control

The Healing Power of Root-Cause Resolution Medicine and the Tools Parsley Uses to Optimize Health

Parsley Health’s Root-Cause Care Is Now In-Network for 10M+ Patients in New York & California

Why Parsley Health's Root-Cause Approach to Long COVID Treatment Works

Your Guide to Addressing Chronic Winter Skin Conditions

What to Expect During Your Year-Long Parsley Membership

Purchasing Prenatal Vitamins? Maximize the Benefits By Looking for These Key Ingredients

What Exactly Are Hormones? Here’s What You Need to Know About Their Critical Roles

The Diagnostic Tests Your Doctor Probably Isn’t Running But Should Be

What Causes Dry Skin? 6 Medical Conditions You Need To Know

Why Your Sleep Routine Needs A Power Hour (And How to Make It Happen)

8 Healthy Sleep Habits You Need to Adopt For Better Overall Wellness

3 Reasons Why Naps Deserve a Spot in Your Self-Care Routine

Why Healthy Blood Sugar Levels Matter, Even if You Don’t Have Diabetes

Want Feel-Good Vibes? Here’s How to Increase Your Happy Hormones

Is It Perimenopause or Menopause? Here’s How to Know

Why SIBO Comes Back, Plus 7 Ways You Can Prevent SIBO Recurrence

Does Your Body Need A Detox? The Answer Is Complicated.

These Are The Effects Stress May Have On Your Period

The Best Sleeping Positions, Based on Your Health Concerns

What are NPs and PAs? Here’s What You Need to Know

Getting Tested for Vitamin Deficiencies Could Be A Gamechanger for Your Health

What Is Holistic Medicine? How Our Holistic Approach Helps You Heal

Here’s Why You Might Be Having Frequent UTIs—And How to Prevent Them From Recurring

Postpartum Anxiety Is The Mental Health Issue No One Is Talking About

Lying Awake? 13 Reasons You Can’t Fall Asleep And What to Do

The Most Common Hormone Imbalances, Explained

The Physical Symptoms of Anxiety You Shouldn’t Ignore

7 Reasons Your Sex Drive is Low And What It Could Signal About Your Health

Your Top Pregnancy Questions—Answered By Parsley Providers

Why Your Diet Might Be The Key to Managing Your Autoimmune Disease

How You Can Use Self-care to Fight Stress, Anxiety, and Social Injustice

Food Sensitivities Are More Common Than You Think. Do You Have One?

Concerned About Inflammation? Here Are 5 Key Supplements That Can Help

Your Period Is Essentially The Fifth Vital Sign. Here’s What It Says About Your Health

10 Signs You May Have A Thyroid Problem, Plus the Most Common Conditions

Here’s Why You May Have an Autoimmune Disorder and Have No Idea

4 Breathing Exercises To Calm Your Anxious Thoughts

The Link Between Autoimmunity and Gut Health

How to Optimize Your Workout Routine for Better Mental Health

Expert insights from Parsley Health clinicians on functional medicine, lab testing, nutrition, lifestyle, and personalized root-cause care for whole-body health.

Parsley Health Blog | Functional Medicine, Labs & Whole-Body Care

Parsley Health Blog

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Parsley Health Becomes the First Functional Medicine Provider to Accept Insurance Nationwide

Latest Articles

Can Functional Medicine Help With Anxiety?

Functional Medicine vs Longevity Medicine: What’s the Difference?

Is a Hair Mineral Analysis Test Worth It? What It Can Actually Reveal About Your Health

Care & Clinical Expertise

Functional Medicine vs Longevity Medicine: What’s the Difference?

Best Holistic Doctors: Top Platforms for Personalized, Whole-Body Care

5 Early Warning Signs of Autoimmune Disease

Member Stories & Updates

Parsley Health Becomes the First Functional Medicine Provider to Accept Insurance Nationwide

How We Discovered Jenn's Mold Toxicity

How Melissa Realized Her IBS Was Actually SIBO

Labs & Biomarkers

How To Read Your Bloodwork Like a Longevity Doctor

Vitamin B12 Deficiency: Causes, Symptoms, and Treatment

Why Are My Ferritin Levels Low? Low Ferritin Causes

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