Dr. Josh Shields

Dr. Josh Shields Integrative Wellness Centers, located at 38777 Six Mile Road Suite 401, is Michigan's premier functional and naturopathic health destination.
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TRANSFORMATION → through Better Thoughts | Better Behaviors | Better Biology
Helping you heal from the inside out by addressing the root cause through a systems-based approach. Our expert team of holistic health professionals offers personalized care to help you achieve optimal wellness by addressing the root causes of your health concerns. As a leading wellness center near you, we specialize in

integrative approaches that blend the best of conventional and natural medicine. Discover how our holistic health center can support your journey towards renewed vitality and well-being. Experience the difference with Michigan's best in functional medicine and start your path to healthier living today.

Most people think of vitamin D as a bone nutrient. A few know it supports immunity. Almost nobody knows this:Vitamin D r...
04/29/2026

Most people think of vitamin D as a bone nutrient. A few know it supports immunity. Almost nobody knows this:

Vitamin D regulates glucocorticoid receptor sensitivity.

Here's why that matters. When cortisol is released, it travels to cells throughout your body and brain and binds to glucocorticoid receptors. Those receptors determine HOW your body responds — and critically, how quickly the stress response gets turned OFF.

When vitamin D is deficient, glucocorticoid receptor function is impaired. Your stress response becomes louder, longer, and harder to shut down. Minor stressors feel disproportionately overwhelming. Recovery from stress takes longer. The HPA axis stays activated when it should be resetting.

Beyond receptor sensitivity, vitamin D also:
- Regulates inflammatory cytokine production (which amplifies the stress response)
- Supports serotonin synthesis (reduced D = reduced serotonin precursor activity)
- Modulates the immune-brain axis — critical for emotional regulation

Standard lab ranges mark deficiency at under 20 ng/mL. Functional medicine targets are 60-80 ng/mL. Most of my patients come in below 40.

This is not a minor gap. It is a foundational deficiency that makes everything else harder to fix.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Bhatt DL, et al. "Vitamin D and glucocorticoid receptor interactions." J Steroid Biochem Mol Biol. 2020;199:105589. https://doi.org/10.1016/j.jsbmb.2020.105589

Have you heard of the pregnenolone steal?Pregnenolone is the master precursor hormone — the raw material your body uses ...
04/29/2026

Have you heard of the pregnenolone steal?

Pregnenolone is the master precursor hormone — the raw material your body uses to manufacture cortisol, DHEA, progesterone, testosterone, and several neurosteroids critical for brain function.

Under normal conditions, pregnenolone gets distributed across all these pathways. Under chronic stress, the body prioritizes survival. The cortisol pathway gets the lion's share. Everything else gets starved.

This is why chronically stressed patients often show up with:
- Low progesterone (anxious, sleep-disrupted, PMS-heavy)
- Low DHEA (depleted, flat mood, poor stress recovery)
- Low testosterone (low drive, muscle loss, fatigue)
- Cognitive decline (pregnenolone itself is a neurosteroid that supports memory and mood)

Conventional medicine never checks pregnenolone. They check cortisol in isolation, maybe DHEA, and call it a day.

A complete picture requires understanding the entire steroid hormone cascade — and identifying where the bottleneck is.

Note: pregnenolone supplementation should be guided by proper testing, not self-prescribed. The cascade is sensitive and dosing without data creates new imbalances.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Hampl R, Starka L. "Pregnenolone and its role in the nervous system." Physiol Res. 2021;70(S4):S379-S395. https://doi.org/10.33549/physiolres.934822

I want to change the way you think about creatine.Most people associate it with muscle mass and gym performance. That's ...
04/28/2026

I want to change the way you think about creatine.

Most people associate it with muscle mass and gym performance. That's the surface story. The deeper story is about your brain.

Your neurons are among the most metabolically demanding cells in your body. Under stress — cognitive load, sleep deprivation, emotional strain — your brain burns through ATP faster than it can regenerate it. The result is mental fatigue, brain fog, slowed processing, and reduced stress tolerance.

Creatine's job is to regenerate ATP through the phosphocreatine system. In the brain, this means faster recovery between demanding cognitive or emotional events. More buffer capacity. Less crash.

Research has shown creatine supplementation can:
- Reduce mental fatigue under sleep deprivation
- Improve working memory and processing speed under stress
- Decrease markers of oxidative stress in neural tissue
- Support mood stability by maintaining neuronal energy reserves

Your brain can synthesize some creatine, but dietary intake (primarily from red meat) and supplementation significantly expand this buffer.

For anyone under chronic stress — which is most of my patients — creatine monohydrate at 5-10g daily is one of the most underutilized tools I recommend.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Rae C, et al. "Oral creatine monohydrate supplementation improves brain performance." Proc Biol Sci. 2003;270(1529):2147-2150. https://doi.org/10.1098/rspb.2003.2492

Let's talk about the system nobody explains properly.Your HPA axis — hypothalamic-pituitary-adrenal — is the master regu...
04/28/2026

Let's talk about the system nobody explains properly.

Your HPA axis — hypothalamic-pituitary-adrenal — is the master regulator of your stress response. When your brain perceives threat (real or perceived, physical or psychological), the hypothalamus fires. The pituitary responds. The adrenals release cortisol.

That's the design. Short burst. Threat passes. System resets.

But under chronic stress, the reset never comes. The axis stays activated. Cortisol output becomes dysregulated — sometimes too high, sometimes too low, often both at different points in the day.

What breaks downstream when the HPA goes haywire:
- Thyroid conversion (T4 → T3) gets suppressed
- Progesterone gets stolen to make more cortisol (pregnenolone steal)
- Immune surveillance drops — you get sick more, heal slower
- Blood sugar regulation destabilizes — insulin resistance climbs
- Sleep architecture collapses — you can't get into deep restorative stages
- Neurotransmitter production suffers — serotonin, dopamine, GABA all take hits

This is why "adrenal fatigue" as a concept was on the right track even if the terminology was imprecise. The dysfunction is real. The HPA axis is genuinely dysregulated in a large percentage of chronically stressed adults.

We start with a single morning cortisol blood draw — but that's just the beginning. A complete workup includes DHEA, pregnenolone, testosterone, SHBG, and a full thyroid panel (TSH, Free T3, Free T4, antibodies). We also run hs-CRP and homocysteine to quantify inflammatory and methylation burden, alongside a comprehensive metabolic panel. That is what a real workup looks like.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Tsigos C, Chrousos GP. "Hypothalamic-pituitary-adrenal axis, neuroendocrine factors and stress." J Psychosom Res. 2002;53(4):865-871. https://doi.org/10.1016/s0022-3999(02)00429-4

We have a cultural obsession with the idea that resilience is a character trait. You either have grit or you don't. You'...
04/27/2026

We have a cultural obsession with the idea that resilience is a character trait. You either have grit or you don't. You're either tough or you're not.

That framing is doing a lot of damage.

Because here's what the research actually shows: your capacity to withstand stress, recover from it, and adapt to future challenges is a physiological reality. It can be measured. It can be depleted. And it can be restored.

It shows up in your HRV score. Your cortisol awakening response. Your DHEA and pregnenolone levels. Your vagal tone.Your mitochondrial function.

When patients come to me exhausted, anxious, and "not responding to anything they try" — they haven't failed at resilience. Their biology has been depleted to the point where resilience is physiologically impossible.

You cannot willpower your way out of a depleted HPA axis. You cannot meditate your way back from a pregnenolone deficiency. You cannot positive-think your way through neuroinflammation.

But you CAN identify the depletions, address them systematically, and rebuild the biological foundation that makes resilience possible.

That's the work. And it's what this series is about.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Feder A, et al. "Psychobiology and molecular genetics of resilience." Nat Rev Neurosci. 2009;10(6):446-457. https://doi.org/10.1038/nrn2649

Here's something most practitioners won't tell you: if your nervous system is stuck in sympathetic overdrive, supplement...
04/27/2026

Here's something most practitioners won't tell you: if your nervous system is stuck in sympathetic overdrive, supplements underperform, hormones don't balance, and gut healing stalls.

The vagus nerve is the longest cranial nerve in your body — running from your brainstem through your heart, lungs, and gut. It's the primary driver of parasympathetic ("rest and digest") tone. And for a massive percentage of chronically stressed patients, it is functionally impaired.

Low vagal tone means:
- Your gut motility slows (hello, constipation and bloating)
- Your immune system loses regulatory control (inflammation rises)
- Your heart rate variability drops (a direct marker of nervous system flexibility)
- Your HPA axis stays activated (cortisol keeps climbing)
- Nutrient absorption decreases (so those supplements you're taking? Less effective)

This is why nervous system regulation isn't a "nice add-on" to a functional medicine protocol. It IS the protocol. Everything else layers on top of it.

How we measure it: Heart Rate Variability (HRV). How we train it: resonance frequency breathing, cold exposure, specific vagal stimulation techniques. More on all of this in upcoming posts.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Bonaz B, et al. "The vagus nerve at the interface of the microbiota-gut-brain axis." Front Neurosci. 2018;12:49. https://doi.org/10.3389/fnins.2018.00049

Every wellness app, every meditation retreat, every "set better boundaries" article is selling you stress management.And...
04/27/2026

Every wellness app, every meditation retreat, every "set better boundaries" article is selling you stress management.

And it's not wrong. Reducing stress input matters. But here's the part nobody talks about: if your biological stress-response system is already broken, reducing input barely moves the needle.

Think of it this way. You can turn down the volume on a blown speaker. But the speaker is still blown.

Stress resilience is about repairing the speaker — rebuilding the biological architecture that determines HOW your nervous system responds to challenge. That includes:

HPA axis function — your brain's command center for the stress response. When it's dysregulated, even minor stressors trigger outsized cortisol output.

Vagal tone — the parasympathetic brake on your stress response. Low vagal tone means your nervous system can't downshift. It stays revved.

Neurosteroid reserve — compounds like pregnenolone and DHEA that buffer the brain against stress. Chronic pressure depletes both.

Mitochondrial capacity — your cells need ATP to recover from stress. Depleted mitochondria = depleted resilience.

This is what functional medicine actually addresses. Not just "do less." Fix the system doing the responding.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: Chrousos GP. "Stress and disorders of the stress system." Nat Rev Endocrinol. 2009;5(7):374-381. https://doi.org/10.1038/nrendo.2009.106

You're not weak. You're overdrawn.There's a concept in health care called allostatic load — the cumulative biological co...
04/26/2026

You're not weak. You're overdrawn.

There's a concept in health care called allostatic load — the cumulative biological cost of chronic stress on your body. Every stressor you face, whether it's a bad night of sleep, an argument, blood sugar swings, a hidden infection, or a demanding job, withdraws from the same account.

The problem isn't any one stressor. It's that most people never stop making withdrawals. The nervous system stays in low-grade activation. Cortisol stays elevated. Inflammation climbs. And the body starts rationing — downregulating thyroid, s*x hormones, digestion, and immune surveillance to keep you alive in "survival mode."

This is why you can eat well, exercise, and still feel terrible. The account is already overdrawn before you get credit for anything you're doing right.

What actually rebuilds the account:
- Nervous system regulation (not just "less stress")
- Targeted nutrients that support HPA axis recovery
- Identifying hidden stressors — gut infections, toxins, hormonal dysfunction
- Sleep quality, not just sleep duration

This series is going to walk you through the biology of stress resilience — not stress management. There's a difference, and it matters.

Struggling with fatigue, brain fog, or mood swings? Get my Free Balance Toolkit — comment BALANCE.

Research: McEwen BS. "Stress, adaptation, and disease. Allostasis and allostatic load." Ann N Y Acad Sci. 1998;840:33-44. https://doi.org/10.1111/j.1749-6632.1998.tb09546.x

This is the gap that functional medicine was built to fill.Conventional psychiatry and psychology treat the mind. That m...
04/25/2026

This is the gap that functional medicine was built to fill.

Conventional psychiatry and psychology treat the mind. That matters.

But the mind runs on biology. And if that biology is dysregulated, no amount of cognitive restructuring, behavioral activation, or medication will fully restore function.

Here's what a complete functional medicine workup actually investigates:

- Full inflammatory panel (CRP, hsCRP, homocysteine, cytokines)
- Comprehensive hormone assessment (DUTCH test, thyroid panel including T3/rT3, s*x hormones)
- Nutrient status (B vitamins, D, magnesium, zinc, iron, ferritin)
- Gut microbiome analysis (GI-MAP — dysbiosis, permeability, pathogens)
- HPA axis function (4-point salivary cortisol curve)
- Methylation and genetic variants affecting neurotransmitter processing

When we find and address what's actually driving the biology, patients who felt stuck for years start to move.

Not because we gave them something new to think about.
Because we fixed the machine that does the thinking.

Ready to look at the full picture? Get my Free Balance Toolkit — comment BALANCE.

Research: Cryan JF, et al. "The microbiota-gut-brain axis." Physiol Rev. 2019;99(4):1877-2013. https://doi.org/10.1152/physrev.00018.2018

The most overlooked piece of health transformation isn't the protocol. It's the identity.Habits aren't primarily about w...
04/25/2026

The most overlooked piece of health transformation isn't the protocol. It's the identity.

Habits aren't primarily about willpower. They're about who you believe you are.

The person who says "I'm someone who moves every day" doesn't argue with themselves about whether to work out. The person who says "I'm trying to eat better" negotiates every single meal.

This matters biologically too: your beliefs about yourself directly influence your nervous system, your stress response, and your compliance with behaviors that require consistency.

If at your core you believe you're broken, that healing isn't possible for you, that you've tried everything and you're just different — your biology responds to that belief. Cortisol stays elevated. Dopamine stays low. Motivation circuits don't fire.

The first shift I try to create in patients isn't a dietary change or a supplement protocol. It's a question:

"What would it mean about you if you actually got better?"

For some people, that question reveals an identity that's been quietly sabotaging every effort.

You are not your diagnosis. You are not your symptoms. You are not your history.

In 2008, researchers from Harvard's Benson-Henry Institute published a landmark study in PLOS ONE.They measured gene exp...
04/24/2026

In 2008, researchers from Harvard's Benson-Henry Institute published a landmark study in PLOS ONE.

They measured gene expression in long-term practitioners of the Relaxation Response versus beginners and controls.

What they found was stunning:

- Over 2,000 genes showed different expression patterns in practiced meditators
- Genes involved in inflammation, oxidative stress, and cellular aging were DOWNREGULATED
- Genes linked to energy metabolism and mitochondrial function were UPREGULATED

Even short-term training produced meaningful shifts.

This is why "just meditating" isn't a soft recommendation — it's a biological intervention with genomic evidence behind it.

When I tell patients to build a daily mind-body practice, I'm not telling them to relax. I'm telling them to change how their DNA is expressed.

That's functional medicine. Root causes, not symptom management.

Research: Dusek JA, et al. "Genomic counter-stress changes induced by the relaxation response." PLoS ONE. 2008;3(7):e2576. https://doi.org/10.1371/journal.pone.0002576

We live in a culture that optimizes for comfort.Convenient food. Entertainment on demand. Every discomfort medicated awa...
04/24/2026

We live in a culture that optimizes for comfort.

Convenient food. Entertainment on demand. Every discomfort medicated away. Every difficult emotion numbed.

And we wonder why chronic illness rates are at historic highs.

The human body wasn't designed for constant comfort. It was designed for challenge, recovery, and adaptation. Movement stress makes muscles grow. Dietary variety builds microbiome resilience. Managed emotional stress builds nervous system capacity.

When we remove all friction — when we make everything frictionless and comfortable — we remove the signals that keep the body sharp.

The most resilient patients I've worked with all have something in common: they've learned to be comfortable being uncomfortable. Not in a punishing way. In a disciplined, intentional way.

They do the hard thing early so they don't have to do the harder thing later.

Your future self is watching what you choose today. Make the choice they'll thank you for.

Dealing with chronic fatigue, brain fog, or health that keeps declining? Get my Free Balance Toolkit — comment BALANCE.

Address

38777 Six Mile Road, Suite 401
Livonia, MI
48152

Opening Hours

Monday 9am - 12pm
2pm - 6pm
Tuesday 2pm - 6pm
Wednesday 9am - 12pm
2pm - 6pm
Thursday 9am - 12pm
2pm - 6pm

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Welcome To Integrative Wellness Centers

We believe your body is an interconnected system that works in harmony to create health. Therefore, we don’t treat your individual symptoms or use medications to cover up your symptoms. Instead, we use a patient-centered Whole Systems Approach, called Functional Medicine, that uncovers and treats the root cause of your symptoms to restore harmony and balance to your health.

Whether you want to live your life to the highest potential or need to take back control over your health, we are here to help. If traditional medicine has let you down and you’re frustrated, you have found your answer. We have helped over a thousand patients get well. Are you going to be the next one?

Click the following link to request an appointment or to learn more: https://www.iwcenters.com/request-for-a-consultation/