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.
(1)

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.

"I'm stressed" is not a diagnosis. And treating all stress patterns the same way is why most protocols fail.In clinical ...
05/07/2026

"I'm stressed" is not a diagnosis. And treating all stress patterns the same way is why most protocols fail.

In clinical practice I see five distinct HPA dysfunction patterns — and each one requires a different approach.

1. WIRED & TIRED: High cortisol output, elevated evening cortisol, anxiety, insomnia, irritability. Body is in sympathetic overdrive. Priority: downregulation — PS, magnesium, L-theanine, breathwork.

2. FLAT & DEPLETED: Cortisol is low across the curve. Morning feels impossible. Zero motivation. Complete emotional flatness. Priority: HPA support and rebuild — pregnenolone (with testing), DHEA, adaptogens, sleep architecture.

3. MORNING CRASH: Blunted cortisol awakening response. The normal cortisol spike that should get you going doesn't happen. Mornings are brutal. Priority: supporting CAR — light exposure, specific adaptogen timing, thyroid evaluation.

4. NIGHT OWL CORTISOL: Cortisol that should be near-zero at 10pm is still elevated. Racing mind, second wind, can't fall asleep despite exhaustion. Priority: blue light hygiene, evening cortisol modulators, gut dysbiosis evaluation (a common driver).

5. REACTIVE PATTERN: Normal baseline, but stress events trigger disproportionate cortisol spikes with slow recovery. HPA "hair trigger." Priority: vagal tone training, phosphatidylserine, HRV biofeedback.

Which one sounds like you? Drop your number in the comments.

Research: Fries E, et al. "The cortisol awakening response (CAR): facts and future directions." Int J Psychophysiol. 2009;72(1):67-73. https://doi.org/10.1016/j.ijpsycho.2008.03.014

Hormesis is the principle that controlled, brief doses of stress make biological systems more resilient to larger stress...
05/07/2026

Hormesis is the principle that controlled, brief doses of stress make biological systems more resilient to larger stressors. Cold exposure is one of the most well-documented examples.

Here's what brief cold exposure actually does to your stress biology:

Norepinephrine: A single cold water immersion (14°C/57°F for one hour) increased plasma norepinephrine by up to 300% in research. Norepinephrine is a neurotransmitter and hormone that drives alertness, focus, mood elevation, and — critically — anti-inflammatory signaling. Chronic low norepinephrine is implicated in depression and fatigue.

Vagal tone: The initial cold shock activates the sympathetic system. But the body's adaptation to sustained cold involves activating the parasympathetic brake — training the nervous system to recover from acute stress activation more efficiently. This is vagal tone training through challenge.

Brown adipose tissue: Cold activates BAT — a metabolically active fat that generates heat through mitochondrial uncoupling. BAT activation improves insulin sensitivity and mitochondrial density — both critical for energy resilience.

Inflammation: Cold exposure reduces inflammatory cytokine production — interrupting the chronic low-grade inflammation that perpetuates HPA dysregulation.

You don't need an ice bath. End your daily shower with 30-60 seconds of cold water, focused breathing, and deliberate composure. That's the starter protocol. Build from there.

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

Research: Shevchuk NA. "Adapted cold shower as a potential treatment for depression." Med Hypotheses. 2008;70(5):995-1001. https://doi.org/10.1016/j.mehy.2007.04.052

Here's the one stress resilience tool that costs nothing, requires no prescription, and has more clinical research behin...
05/07/2026

Here's the one stress resilience tool that costs nothing, requires no prescription, and has more clinical research behind it than most pharmaceuticals for anxiety.

Resonance frequency breathing — approximately 5-6 breath cycles per minute — synchronizes your breathing rhythm with the natural oscillation frequency of your cardiovascular system. This produces maximum heart rate variability (HRV) amplitude, which is a direct measure of vagal tone — your parasympathetic nervous system's capacity to regulate the stress response.

The science is not subtle. This breathing pattern has been shown to:
- Measurably increase vagal tone (HRV) in a single session
- Reduce salivary cortisol after 8 weeks of consistent practice
- Improve emotional regulation and stress reactivity
- Support blood pressure normalization
- Improve sleep onset and quality
- Reduce symptoms of anxiety, depression, and PTSD

The protocol is simple. Inhale 4 seconds. Exhale 6 seconds. No breath-holding. Smooth and continuous. 10-20 minutes 2 times daily. Track with an HRV app (HRV4Training or Elite HRV work well).

Within 4-8 weeks of consistent practice, most patients see measurable improvements in resting HRV. That number is a direct readout of your nervous system's resilience capacity.

This is where every stress protocol should begin. Before supplements. Before anything else.

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

Research: Lehrer PM, Gevirtz R. "Heart rate variability biofeedback." Front Psychol. 2014;5:756. https://doi.org/10.3389/fpsyg.2014.00756

Heart Rate Variability. If you're serious about understanding your stress resilience, this is the number you should be t...
05/06/2026

Heart Rate Variability. If you're serious about understanding your stress resilience, this is the number you should be tracking.

HRV measures the variation in time between consecutive heartbeats. A higher HRV means your nervous system is flexible — able to upshift when challenged and downshift when the threat passes. A lower HRV means your system is rigid, locked in a low-grade stress state, with limited capacity to adapt.

HRV is the single best non-invasive measure of:
- Vagal tone (parasympathetic nervous system activity)
- HPA axis regulation quality
- Physiological recovery from stress
- Cardiovascular health
- Emotional regulation capacity

Low HRV predicts cardiovascular events, all-cause mortality, depression, anxiety, and poor recovery from illness — better than most standard biomarkers.

What drives HRV down: chronic stress, poor sleep, alcohol, processed food, inflammation, infections, and sedentary behavior.

What drives HRV up: resonance breathing, consistent aerobic exercise, quality sleep, cold exposure, key nutrients (magnesium, omega-3s), and addressing root cause dysfunction.

You can track HRV with a chest strap (most accurate) or with wrist devices like Garmin or Apple Watch (decent trending data). Apps like HRV4Training or Whoop provide context and trend analysis.

If your HRV is trending down over weeks, your biology is under stress it cannot absorb. That's the signal to act — before symptoms become diagnoses.

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

Research: Thayer JF, et al. "The relationship of autonomic imbalance, heart rate variability and cardiovascular disease risk factors." Int J Cardiol. 2010;141(2):122-131. https://doi.org/10.1016/j.ijcard.2009.09.543

Your stress biology runs on a circadian rhythm. Cortisol peaks in the morning (cortisol awakening response), declines th...
05/05/2026

Your stress biology runs on a circadian rhythm. Cortisol peaks in the morning (cortisol awakening response), declines through the day, and should be near baseline by evening. Supplement timing should work with that rhythm — not against it.

MORNING compounds (support the active, responsive phase):
Ashwagandha — cortisol modulation is most relevant during peak HPA activity
Methylated B vitamins — fuel methylation and neurotransmitter synthesis when you need them
Omega-3s — taken with food for absorption; sets inflammatory tone for the day
Creatine — brain energy buffer most relevant during cognitive demand periods

EVENING compounds (support recovery, downregulation, and repair):
Magnesium glycinate — supports GABA, NMDA regulation, and deep sleep architecture
L-theanine — promotes alpha wave relaxation and sleep onset without sedation
Phosphatidylserine — some research suggests evening dosing supports cortisol decline
EGCG (decaf) — tissue-level cortisol metabolism and anti-inflammatory without sleep disruption
Glycine — 3g before bed supports glymphatic clearance and restorative sleep stages

This isn't a rigid prescription — it's a physiological logic framework. Your specific protocol depends on your labs, your lifestyle, and what your HPA axis is actually doing at different points in the day.

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

Research: Bhattacharya SK, Muruganandam AV. "Adaptogenic activity of Withania somnifera." Pharmacol Biochem Behav. 2003;75(3):547-555. https://doi.org/10.1016/s0091-3057(03)00110-2

Methylation is one of the most important and least discussed processes in stress biology.Every time your body makes dopa...
05/05/2026

Methylation is one of the most important and least discussed processes in stress biology.

Every time your body makes dopamine, serotonin, norepinephrine, or metabolizes cortisol — methylation is involved. And methylation runs on B vitamins. Specifically: B12 (methylcobalamin), B6 (pyridoxal-5-phosphate), folate (methylfolate), and B2 (riboflavin).

Here's the problem: a significant percentage of the population carries MTHFR or related genetic variants that impair their ability to convert standard (synthetic) B vitamins into their active methylated forms. When you're under chronic stress and burning through neurotransmitters at an accelerated rate, an already-impaired methylation cycle becomes a critical bottleneck.

The downstream consequences include:
- Elevated homocysteine (a vascular and neurological toxin)
- Impaired SAMe production (your body's primary methyl donor — critical for mood)
- Reduced serotonin and dopamine synthesis
- Impaired cortisol clearance (stress hormones accumulate longer)
- Increased neuroinflammation

Standard B-complex products use cyanocobalamin and folic acid — the synthetic precursors that require conversion. For anyone with methylation challenges — or simply under high stress load — pre-methylated forms (methylcobalamin, methylfolate, P5P) bypass the bottleneck entirely.

This is one of the most clinically impactful swaps I make with patients. Same nutrient. Different form. Meaningfully different results.

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

Research: Bottiglieri T. "Folate, vitamin B12, and neuropsychiatric disorders." Nutr Rev. 1996;54(12):382-390. https://doi.org/10.1111/j.1753-4887.1996.tb03851.x

Chronic stress physically shrinks your brain. That's not a metaphor.Research consistently shows that chronic HPA axis ac...
05/04/2026

Chronic stress physically shrinks your brain. That's not a metaphor.

Research consistently shows that chronic HPA axis activation reduces gray matter volume in the prefrontal cortex and hippocampus — the regions responsible for decision-making, emotional regulation, and memory consolidation. This is mediated largely by suppressed BDNF (brain-derived neurotrophic factor) and NGF (nerve growth factor) — the proteins that maintain and grow neural connections.

Lion's Mane mushroom (Hericium erinaceus) contains two unique compounds — hericenones and erinacines — that cross the blood-brain barrier and stimulate NGF synthesis. No other food or supplement has been shown to do this as reliably.

What NGF restoration supports in the context of chronic stress:
- Neuroplasticity — the brain's ability to form new connections and adapt
- Hippocampal regeneration — partially reversing the structural damage from elevated cortisol
- Improved cognitive function and memory
- Reduced anxiety behaviors in animal models (with emerging human data)
- Myelin repair — supporting the white matter that chronic neuroinflammation damages

This is not a "brain booster" in the nootropic-marketing sense. This is targeted support for a specific biological mechanism — neurotrophic repair — that chronic stress actively impairs.

For patients recovering from burnout, long-term stress, or cognitive decline: this is foundational, not optional.

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

Research: Mori K, et al. "Nerve growth factor-inducing activity of Hericium erinaceus." Biol Pharm Bull. 2008;31(9):1727-1732. https://doi.org/10.1248/bpb.31.1727

EGCG — epigallocatechin gallate — is the primary catechin in green tea, and it operates through mechanisms that make it ...
05/04/2026

EGCG — epigallocatechin gallate — is the primary catechin in green tea, and it operates through mechanisms that make it genuinely relevant to stress biology, not just antioxidant marketing.
N
Here's what the research shows:

EGCG inhibits the enzyme 11β-HSD1, which converts inactive cortisone into active cortisol in tissues — particularly in fat cells and the brain. This means EGCG effectively reduces local cortisol production at the tissue level, even when systemic cortisol output from the adrenals is elevated. This is a meaningful and underappreciated mechanism for blunting the tissue-level damage of chronic stress.

EGCG also:
- Crosses the blood-brain barrier and demonstrates direct neuroprotective effects against oxidative stress
- Supports BDNF expression — the neuroplasticity factor that chronic stress suppresses
- Modulates GABA-A receptors (similar mechanism to L-theanine) — contributing to anxiolytic effects
- Reduces pro-inflammatory cytokine production — interrupting the stress-inflammation feedback loop

The L-theanine + EGCG combination in green tea is not coincidental. They work synergistically — theanine dampening acute stress reactivity, EGCG managing the cortisol tissue burden and neuroinflammation downstream.

For patients who don't tolerate caffeine well, decaffeinated green tea extract or isolated EGCG (200-400mg) captures these benefits without the stimulant load.

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

Research: Maron DJ, et al. "Cholesterol-lowering effect of a theaflavin-enriched green tea extract." Arch Intern Med. 2003;163(12):1448-1453. Plus: Yin Z, et al. "EGCG inhibits 11β-HSD1." Mol Nutr Food Res. 2011;55(8):1200-1209. https://doi.org/10.1002/mnfr.201000609

If cortisol is the gas pedal of your stress response, DHEA is the brake.DHEA (dehydroepiandrosterone) is produced by you...
05/03/2026

If cortisol is the gas pedal of your stress response, DHEA is the brake.

DHEA (dehydroepiandrosterone) is produced by your adrenal glands and serves as a counter-regulatory hormone to cortisol — buffering its catabolic, inflammatory, and immunosuppressive effects. It's also the precursor to testosterone and estrogen.

Under chronic stress, the same HPA activation that keeps cortisol elevated simultaneously suppresses DHEA production. The cortisol-to-DHEA ratio shifts dramatically — and that ratio is now recognized as one of the most meaningful biomarkers of physiological stress burden, biological aging, and resilience capacity.

A high cortisol-to-DHEA ratio is associated with:
- Accelerated cellular aging and telomere shortening
- Impaired immune function
- Increased depression and anxiety risk
- Reduced cognitive performance and memory
- Decreased muscle mass and increased abdominal fat
- Osteoporosis risk

Your conventional doctor almost certainly never tested your DHEA-S or your cortisol - which tells you almost nothing about dynamic HPA axis function.

A morning cortisol blood draw is the starting point. Alongside that, serum DHEA-S, pregnenolone, testosterone, and SHBG complete the picture of where the steroid cascade is breaking down. For patients where we want to see how hormones are being metabolized and cleared, we add the DUTCH. That's the data that matters.That's the data that matters.

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

Research: Hechter O, et al. "DHEA and aging." Ann N Y Acad Sci. 1997;828:1-16. https://doi.org/10.1111/j.1749-6632.1997.tb48518.x

Not all adaptogens are created equal for all situations. Where rhodiola stands apart is a very specific use case: mainta...
05/03/2026

Not all adaptogens are created equal for all situations. Where rhodiola stands apart is a very specific use case: maintaining cognitive and physical performance when you're already depleted.

The research on rhodiola — particularly the standardized SHR-5 extract — is more relevant to the modern chronically stressed patient than almost any other adaptogen I use.

Here's the clinical picture:

A landmark double-blind trial in stressed-out physicians during night shifts showed rhodiola significantly improved mental performance, concentration, and reduced fatigue compared to placebo — after just two weeks.

The primary active compounds are rosavins and salidroside, which appear to modulate stress-protein expression and reduce the depletion of stress hormones under prolonged demand.

Mechanistically, rhodiola works through several pathways:
- Inhibits MAO-A and MAO-B enzymes — supporting dopamine and serotonin availability
- Modulates the stress-activated kinase JNK — which drives cellular fatigue and aging under chronic stress
- Supports cortisol normalization in a bidirectional manner (brings elevated cortisol down, supports depleted cortisol up)
- Protects mitochondrial function under stress-induced oxidative damage

For anyone carrying a heavy cognitive and emotional load — which describes most of my patients — rhodiola is one of the first adaptogens I consider.

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

Research: Darbinyan V, et al. "Rhodiola rosea in stress induced fatigue." Phytomedicine. 2000;7(5):365-371. https://doi.org/10.1016/S0944-7113(00)80055-0

I want to talk about one of the most underutilized compounds in stress medicine.Phosphatidylserine (PS) is a phospholipi...
05/02/2026

I want to talk about one of the most underutilized compounds in stress medicine.

Phosphatidylserine (PS) is a phospholipid — a fat molecule — that makes up approximately 15% of your brain's total fat content. It's a structural component of neural cell membranes, concentrated heavily in the regions most affected by chronic stress.

Under chronic HPA activation, PS gets depleted. And here's where it gets interesting: supplementing PS has been shown in multiple human clinical trials to blunt the cortisol AND ACTH response to physical and psychological stress. The FDA has granted it a qualified health claim specifically for this mechanism.

This is not an adaptogen that modulates stress signals upstream. PS works at the receptor level — it appears to enhance glucocorticoid receptor sensitivity and support the negative feedback loop that tells the HPA axis to stand down after a stressor has passed.

Clinically this translates to:
- Faster cortisol recovery after stress events
- Improved memory under stress (PS supports hippocampal function)
- Reduced subjective stress perception
- Better mood stability in chronically stressed adults

The therapeutic dose used in research is typically 300-400mg daily of soy or sunflower-derived PS. This is a compound worth knowing about.

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

Research: Hellhammer J, et al. "Effects of soy lecithin phosphatidic acid and phosphatidylserine complex on stress." Stress. 2004;7(2):119-126. https://doi.org/10.1080/10253890410001728379

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

Website

Alerts

Be the first to know and let us send you an email when Dr. Josh Shields posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Practice

Send a message to Dr. Josh Shields:

Shortcuts

Share

Category