Health Hub: Complete Evidence-Based Protocol Library

This hub organizes every evidence-based health article on The Private Practice by topic. Each post is written by Dr. Tom Biernacki, DPM — a surgeon with a functional medicine focus on root-cause health optimization. Find your topic, follow the internal links, and build a protocol from the evidence.

Lab Testing & Biomarkers

Understanding your labs is the foundation of personalized medicine. These posts decode the tests that actually matter — and the optimal ranges that standard lab reports ignore.

Essential Nutrients

Over half the US population is deficient in at least one of these nutrients — and standard testing misses most of them.

Hormones & Metabolism

Hormonal health underpins energy, body composition, mood, and longevity. These posts cover the reversible drivers of hormonal dysfunction.

Longevity & Performance

The science of extending healthspan — not just lifespan. Zone 2 exercise, muscle preservation, VO2 max, and the supplement stack with genuine human trial evidence.

Gut Health & Inflammation

The gut microbiome regulates systemic inflammatory tone, immune function, and neurological health. These posts cover the root-cause approach to chronic inflammation and gut dysfunction.

  • The Gut Microbiome: A Complete Evidence-Based Guide — Dysbiosis, the gut-brain axis, leaky gut, and dietary interventions.
  • Leaky Gut (Intestinal Permeability): The 4R Repair Protocol — Measurable via zonulin and lactulose/mannitol testing. L-glutamine, zinc, butyrate in 4-8 weeks.
  • Methylation and MTHFR Protocol — Complete guide to MTHFR variants, SAMe cycle optimization, homocysteine reduction, and personalized methylfolate, methylcobalamin, and TMG protocols for cardiovascular, neurological, and hormonal health.
  • Omega-3 Fish Oil Protocol — EPA vs. DHA functions, omega-3 index testing (target above 8%), REDUCE-IT trial cardiovascular evidence, therapeutic dosing by indication, and formulation selection guide.
  • Seed Oils and Inflammation — Evidence-based review of linoleic acid, omega-6:omega-3 ratio dysregulation, 4-HNE heat oxidation products, and the practical cooking oil hierarchy for anti-inflammatory eating.
  • Low Testosterone in Men — Natural optimization protocol including zinc, vitamin D, ashwagandha KSM-66 (15% RCT increase), sleep repair, body composition, and full TRT evaluation guide with TRAVERSE trial safety data.
  • Blood Sugar and Insulin Resistance Diet — Testing with fasting insulin and HOMA-IR, carbohydrate reduction, food sequencing (29-37% glucose reduction), early time-restricted eating, Zone 2 exercise, and berberine protocol for full metabolic reversal.
  • Carnivore Diet Evidence Review — Balanced analysis of the anti-nutrient hypothesis (lectins, oxalates, FODMAPs), Harvard survey outcomes (78% IBD remission), nutritional considerations, and clinical application for autoimmune and gut conditions unresponsive to AIP.
  • Mitochondrial Dysfunction Protocol — Root causes, organic acid testing, and the restoration protocol using Zone 2 training, CoQ10 ubiquinol, NMN/NR, PQQ, R-ALA, and ALCAR for 20-40% mitochondrial density increase in 8-12 weeks.
  • Sleep Optimization: Deep Sleep Protocol — Science of SWS, glymphatic brain clearance, and evidence-based deep sleep enhancement using morning light, temperature management, magnesium glycinate, glycine 3g, and ashwagandha KSM-66.
  • Circadian Rhythm Optimization — Complete clock reset protocol using morning bright light (10,000 lux), early time-restricted eating, evening blue light blocking, melatonin 1mg, and magnesium glycinate to normalize cortisol and melatonin in 2-4 weeks.
  • Serotonin and the Gut-Brain Connection — 90% of serotonin is made in the gut, regulated by the microbiome. Dysbiosis activates IDO1 to divert tryptophan toward neurotoxic kynurenine, linking leaky gut to depression and anxiety.
  • Postmenopause Hormone Therapy — Evidence-based bioidentical HRT: transdermal estradiol plus micronized progesterone initiated within 10 years of menopause reduces mortality 30%, cardiovascular disease 40-50%, and dementia risk. WHI timing hypothesis explained.
  • Metabolic Flexibility Training — Restoring the ability to efficiently switch between fat and glucose burning. Zone 2 training and carbohydrate periodization normalize fasting insulin, TG:HDL, and fat oxidation capacity in 4-8 weeks.
  • Collagen Peptides Benefits — 15g hydrolyzed collagen + 50mg vitamin C before exercise doubles tendon collagen synthesis (Shaw 2017). Evidence for joint pain, skin elasticity, bone density, and tendon healing with protocol, timing, and sourcing guidance.
  • Continuous Glucose Monitoring (CGM) — Time in range, glucose variability, and postprandial glucose targets for non-diabetic metabolic optimization. CGM-guided dietary modification reduces peak glucose 30-50% in 2-4 weeks.
  • Intermittent Fasting and Hormones — Complete hormonal response to fasting: insulin reduction 20-31%, growth hormone up to 5-fold increase, norepinephrine 3.6-fold increase, leptin sensitivity normalization. Protocol selection guide for insulin resistance, metabolic flexibility, and longevity.
  • Cortisol Awakening Response — The most sensitive objective HPA axis biomarker. Blunted CAR predicts burnout, chronic fatigue, and immune dysfunction. Testing protocol, 24-hour cortisol pattern interpretation, and evidence-based CAR restoration with morning light and consistent wake time.
  • Autophagy: Fasting and Cellular Recycling — Nobel Prize-winning science on the cellular self-cleaning process. AMPK activation, mTORC1 inhibition, and 12-16 hour fasting trigger mitophagy and protein aggregate clearance — the mechanism behind fasting’s longevity effects. Rapamycin, berberine, and spermidine as autophagy inducers.
  • Vitamin D Deficiency Protocol — 42% of Americans are deficient. Optimal functional levels 50-80 ng/mL. Protocol: 5,000-10,000 IU D3 + vitamin K2 MK-7 + magnesium glycinate. Complete testing guide with latitude, skin tone, and obesity dosing adjustments.
  • Inflammation Biomarkers Testing Guide — hsCRP, LPS-binding protein, homocysteine, GlycA, ferritin, and uric acid: the complete functional panel for measuring systemic inflammation and guiding evidence-based anti-inflammatory protocols.
  • Food Sensitivity vs Allergy vs Intolerance: Testing and Elimination Protocol — IgG tests are unreliable. Gold standard: 3-6 week elimination diet + reintroduction. Celiac, NCGS, histamine intolerance, and leaky gut connections.
  • SIBO: Symptoms, Testing and Complete Treatment Protocol — Three subtypes: hydrogen (rifaximin), methane/IMO (rifaximin+neomycin), hydrogen sulfide (bismuth). MMC restoration and prokinetics for relapse prevention.
  • Gut Health Restoration: The 4R Protocol for Leaky Gut & IBS — Remove pathogens and inflammatory foods, Replace digestive enzymes, Reinoculate with probiotics, Repair the gut lining — the complete 4R framework that resolves IBS in 72% of patients.
  • Liver Detoxification: Phase 1, Phase 2 & Evidence-Based Support Protocol — CYP450 creates reactive intermediates that Phase 2 must neutralize. Glutathione, methylation, glucuronidation. NAC, DIM, milk thistle, calcium-D-glucarate protocol.
  • Progesterone Deficiency Symptoms — Signs, testing, and evidence-based protocol including vitex, nutritional cofactors, and bioidentical progesterone for luteal phase deficiency and estrogen dominance.
  • Adrenal Fatigue and HPA Axis Dysregulation — Evidence-based protocol for cortisol dysregulation including 4-point salivary testing, ashwagandha KSM-66, phosphatidylserine, rhodiola, and Zone 2 exercise prescription.
  • Longevity Biomarkers Testing Panel — The 15 biomarkers that actually predict lifespan including VO2max, ApoB, fasting insulin, grip strength, HOMA-IR, and epigenetic age — with functional reference ranges most labs do not use.
  • Mold Toxicity and Mycotoxin Protocol — CIRS diagnosis and treatment including GPL MycoTOX testing, ERMI environmental assessment, cholestyramine binder protocol, glutathione support, and mast cell stabilization.
  • Heavy Metal Detox Protocol — Testing body burden with DMSA provoked urine challenge, biological chelation with modified citrus pectin (560% increased lead excretion), chlorella, NAC, and pharmaceutical chelation when indicated.
  • BPC-157 and TB-500 Peptides — Research evidence for tissue healing peptides including 120+ BPC-157 studies on tendon repair, gut healing, and neuroprotection, TB-500 mechanisms, regulatory status, and safety considerations.
  • Gut Microbiome: Diversity, Testing & Restoration Complete Guide — 30-plant rule, daily fermented foods, prebiotic fiber, GI-MAP testing. How dysbiosis drives immune, metabolic, and mental health dysfunction.
  • The Gut-Brain Axis: How Your Microbiome Controls Mood, Cognition, and Mental Health — 90% of serotonin and 80% of dopamine produced in the gut. LPS neuroinflammation, tryptophan diversion, and alpha-synuclein pathways. The 4-step restoration protocol.
  • Probiotics: The Strain-Specific Guide to What Actually Works — LGG for antibiotic diarrhea (52% risk reduction), Akkermansia for metabolic syndrome, B. longum 1714 for stress/cortisol. Match strain to indication.
  • Histamine Intolerance: The 4 Root Causes, How to Test, and the Resolution Protocol — DAO enzyme deficiency causes load-dependent headaches, flushing, and GI symptoms. Gut repair, DAO supplements, and histamine-neutral probiotics resolve in 8-12 weeks.
  • Adrenal Fatigue and HPA Axis Protocol — DUTCH Complete cortisol profiling, blunted CAR diagnosis, and recovery protocol: ashwagandha KSM-66 (27% cortisol reduction), rhodiola, phosphatidylserine, and circadian rhythm restoration for the three stages of HPA dysregulation.
  • Sauna Health Benefits — The science of heat stress: 40% all-cause mortality reduction at 4-7x/week (Laukkanen 2015), HSP70 activation, 16x growth hormone release, BDNF neurogenesis, 66% lower Alzheimer’s risk, and Finnish vs. infrared comparison.
  • Cold Therapy and Cold Water Immersion — RBM3 neuroprotection, 200-300% norepinephrine surge, brown fat BAT activation, 35-40% DOMS reduction, and the Søberg 11 minutes/week threshold for metabolic and cognitive benefits.
  • Red Light Therapy and Photobiomodulation — CcO mitochondrial activation at 630-850 nm, 9 systematic reviews for pain, 47% Hashimoto’s medication discontinuation at 2 years (Höfling), FDA-cleared hair loss, and transcranial protocols for brain optimization.
  • Senescent Cells & Senolytics — Dasatinib + quercetin and fisetin eliminate senescent SASP-secreting cells; the first human RCT (Kirkland 2019) documented improved physical function. Senostatics include rapamycin, NMN, and apigenin.
  • Hyperbaric Oxygen Therapy (HBOT) — 60 sessions at 2.0 ATA produced 20–38% telomere lengthening and 37% senescent T-cell reduction (Hachmo 2020); FDA-approved for 13 indications including diabetic foot ulcers and radiation injury.
  • Biological Age Testing & Epigenetic Clocks — GrimAge and DunedinPACE measure your DNA methylation aging rate; controlled trials demonstrate 1.5–3.2 year reductions from Mediterranean diet, Zone 2, and caloric restriction. TruDiagnostic TruAge provides comprehensive panels.
  • Fasting Mimicking Diet (FMD) — Valter Longo’s 5-day, very-low-protein protocol suppresses IGF-1 by 30–40%, induces autophagy, and triggers stem cell regeneration; the 2016 RCT (n=100) demonstrated reductions in glucose, blood pressure, cholesterol, and CRP.
  • Vagus Nerve & HRV — The cholinergic anti-inflammatory reflex suppresses TNF-α via α7nAChR; rMSSD (HRV) tracks vagal tone. Evidence-based activation: resonance breathing, cold exposure, auricular taVNS. FDA-approved implantable VNS for RA, depression, and stroke rehab.
  • IV Nutrient Therapy & Myers Cocktail — IV vitamin C at 25–75g achieves plasma levels 20–60x higher than oral, generating selective anti-tumor H2O2; Myers Cocktail has strong evidence for fibromyalgia, migraine, asthma, and infection. IV NAD+ restores mitochondrial function acutely.
  • Environmental Toxins & Microplastics — Microplastics in arterial plaques correlate with 4.53x higher cardiovascular events (Marfella 2023); PFAS contaminate 45% of U.S. tap water. BPA, phthalates, heavy metals, and pesticides disrupt hormones and mitochondria. Reverse osmosis, organic produce, sulforaphane, and sauna are evidence-based reduction strategies.
  • VO2max & Cardiorespiratory Fitness — Low VO2max carries 5x higher all-cause mortality risk vs. elite fitness (Mandsager 2018, n=122,007); every 1 MET improvement reduces mortality 10–17%. Norwegian 4×4 HIIT produces 7.2% VO2max gain in 8 weeks. Zone 2 drives mitochondrial density.
  • Muscle, Myokines & Sarcopenia — Muscle releases 600+ myokines (irisin, IL-15, FSTL-1) driving BDNF neurogenesis, NK cell senolysis, and cardiac protection. Grip strength predicts mortality better than blood pressure (Lancet 2015). Sarcopenia affects 50% over age 80; resistance training 2x/week reduces all-cause mortality 10–17%.
  • Lyme Disease & Tick-Borne Co-Infections — 476,000 estimated U.S. cases annually; standard serology misses 30–50% of early cases. Bartonella, Babesia, and Anaplasma co-infections require separate testing and treatment. Michigan emerging endemic state with western Lower Peninsula highest risk.
  • Glymphatic System & Brain Detox During Sleep — How AQP4 water channels, slow-wave sleep, and sleep position drive amyloid clearance, and what you can do to optimize nocturnal brain detoxification.
  • Ozone Therapy: Medical O₃ Treatments, Evidence & Protocols — How ozone activates Nrf2 antioxidant defenses, upregulates SOD and catalase, delivers antimicrobial effects, and supports chronic pain, wound healing, and longevity — with clinical RCT evidence and safety protocols.
  • PEMF Therapy: Pulsed Electromagnetic Field Science & Protocols — How PEMF activates voltage-gated calcium channels, upregulates nitric oxide synthase, accelerates bone healing, reduces osteoarthritis inflammation, and supports longevity through mitochondrial optimization.
  • Telomere Health & Telomerase Activation — How telomeres protect chromosomes, what accelerates their shortening (stress, inflammation, toxins, poor sleep), and evidence-based interventions including TA-65, omega-3 DHA/EPA, NAD+ precursors, and exercise to protect and lengthen your chromosomal clock.
  • Peptide Therapy: BPC-157, TB-500, GHK-Cu & Growth Hormone Secretagogues — How therapeutic peptides accelerate tendon and tissue repair, restore physiological GH pulsatility, activate anti-aging gene expression, and address sexual health — with mechanisms, dosing, and regulatory guidance.
  • Bioidentical Hormone Replacement Therapy (BHRT): Evidence-Based Guide — Estradiol, progesterone, testosterone, DHEA, and thyroid optimization with WHI controversy clarified, E3N safety data, DUTCH test interpretation, delivery method comparison, and longevity applications.
  • Gut Microbiome & Dysbiosis: Testing, Diet, and Treatment Guide — Key species (Faecalibacterium, Akkermansia), short-chain fatty acids, gut-brain axis, FMT for C. diff, evidence-based probiotics, dietary interventions, and comprehensive microbiome testing options.
  • Intermittent Fasting & Time-Restricted Eating: Circadian Biology & Evidence — How circadian clock mechanisms, autophagy induction, and AMPK/mTOR balance make when you eat as important as what you eat — with RCT evidence for diabetes reversal, blood pressure reduction, cancer prevention, and longevity.
  • Cold Therapy & Ice Bath Science: CWI, Cryotherapy Evidence — How cold water immersion activates brown adipose tissue, produces 200-300% norepinephrine surge, induces RBM3 neuroprotection, reduces DOMS, and supports longevity — with practical protocols and the critical hypertrophy timing caveat.
  • Infrared Sauna Therapy: Heat Stress, Longevity & Detox — KUOPIO study evidence: 40% all-cause mortality reduction, 50% fatal CVD reduction, HSP70, heavy metal elimination, and endurance enhancement protocols.
  • Functional IBD: Crohn’s & Ulcerative Colitis Root Causes — Microbiome dysbiosis, curcumin 50% remission (Hanai 2006), FMT 32% remission (Paramsothy 2017), LDN 88% response, exclusion diets, mucosal barrier restoration.
  • Functional Dermatology: Acne, Psoriasis, Eczema & Rosacea Root Causes — Gut-skin axis, SIBO 10x in rosacea (Parodi 2008), dairy-IGF-1 acne mechanism, eczema probiotics 22% reduction (Wickens 2008), zinc RCTs.
  • Functional Pediatrics: ADHD, Autism & Recurrent Infections Root Causes — Iron deficiency in 40% of ADHD children, omega-3 comparable to methylphenidate (Bloch 2011), FMT improves ASD (Kang 2017), few foods diet 64% ADHD response, probiotics reduce infections 68%.
  • Functional Hematology: Iron Deficiency, B12 & Anemia Root Causes — Ferritin <30 in 40% of premenopausal women, B12 deficiency from metformin (de Jager 2010), anemia of inflammation hepcidin mechanism, MTHFR methylation, alternate-day iron dosing.
  • Functional ADHD & Autism: Pediatric Neurology Root Causes — Iron deficiency comparable to methylphenidate (Konofal RCT), omega-3 meta-analysis, organophosphate ADHD risk, McCann food dyes Lancet RCT, ASD gut microbiome probiotic trial.
  • Functional Urology: IC, Recurrent UTI, BPH & Pelvic Floor — D-mannose 2.3× better than antibiotics (Kranjčec 2014), mast cell IC/BPS, saw palmetto BPH (18 RCTs), urinary microbiome Lactobacillus crispatus, pelvic floor dysfunction in 85% of IC patients.
  • Functional Allergy & Asthma: Gut-Lung Axis & Food Allergy Root Causes — LEAP trial 81% peanut allergy prevention, hygiene hypothesis, vitamin D Treg induction, omega-3 64% asthma reduction, oral immunotherapy, and eczema Lactobacillus GG 50% prevention.
  • Functional Dermatology: Acne, Psoriasis, Rosacea & Hair Loss Root Causes — gut-skin axis SIBO-rosacea (71% clearance), dairy/glycemic acne drivers (Cordain 2002), psoriasis Mediterranean diet PASI reduction, collagen peptide RCTs, hair loss iron/thyroid protocols.
  • Functional Ophthalmology: AMD, Dry Eye & Glaucoma Root Causes — AREDS2 26% AMD reduction, omega-3 meibomian gland function, nicotinamide RGC neuroprotection, benfotiamine diabetic retinopathy, astaxanthin blood-retinal barrier.
  • Functional Sports Medicine: VO2max, Zone 2 & Athletic Performance Science — 5× mortality reduction from elite fitness, Zone 2 PGC-1α mitochondrial biogenesis, creatine 1000+ studies, 1.62g/kg protein threshold, Veillonella 13% endurance improvement, HRV-guided training.
  • Functional ENT: Tinnitus, Menière’s, BPPV & Sinusitis Root Causes — tinnitus insulin resistance (84% prevalence), vitamin D 76% BPPV recurrence prevention (Jeong 2013), Menière’s food allergy 61% reduction, Mayo Clinic 96% fungal sinusitis, cochlear antioxidant protocols.
  • Functional Immune Optimization: Vitamin D, Gut-Immune Axis & Sleep Science — vitamin D 2,000 immune genes, gut-immune axis 70-80% of immunity, NK cell 70% sleep reduction, zinc acetate 33% cold reduction, fermented foods 19 inflammatory markers, elderberry RCTs.
  • Functional Weight Loss & Obesity Medicine — Leptin resistance, insulin signaling, GLP-1 mechanisms, gut microbiome, metabolic flexibility, CGM-guided nutrition, and Virta Health 12% weight loss protocol.
  • Pre-Diabetes Reversal — DPP trial 58% reversal, CGM-guided personalized nutrition, berberine vs metformin, gut microbiome, sleep apnea, HOMA-IR, and comprehensive 6-12 month reversal protocol.
  • Functional Hepatology: NAFLD & NASH Reversal — Fructose as hepatotoxin, gut-liver LPS axis, choline deficiency, environmental toxins, vitamin E PIVENS trial, berberine, omega-3s for liver fat reversal.
  • Functional Thyroid Medicine: Hashimoto’s & Hypothyroidism — Complete thyroid panel beyond TSH, selenium 49% TPO reduction, Hashimoto’s autoimmune reversal, T3 conversion, DIO2 polymorphism, thyroid disruptors.
  • Functional Pulmonology: COPD & Asthma Root Causes — Gut-lung axis SCFAs, vitamin D 45% exacerbation reduction, omega-3 64% bronchoconstriction reduction, NAC, NRF2/sulforaphane, pulmonary rehabilitation Cochrane evidence.
  • HPA Axis Dysregulation & Adrenal Fatigue — Salivary cortisol testing, cortisol:DHEA ratio, ashwagandha KSM-66 28% cortisol reduction, rhodiola, blood sugar HPA rehabilitation, gut-HPA cortisol axis, DUTCH adrenal evaluation.
  • Functional Migraine Medicine: Magnesium, Riboflavin, CoQ10 & Root Causes — AHS Level B magnesium 400 mg, riboflavin 50% frequency reduction (Schoenen 1998), CoQ10 47.6% reduction (Sándor 2005), gut-brain axis, hormonal triggers.
  • Chronic Inflammation: Causes, Biomarkers, and Solutions — hs-CRP interpretation and the diet and lifestyle protocol.
  • Anti-Inflammatory Diet: Lower CRP 30-40% in 8 Weeks — Mediterranean evidence, 8 most potent anti-inflammatory foods, and the 30-day protocol.
  • The Autoimmune Protocol (AIP) Diet: Evidence and Implementation Guide — 73% IBD remission and 29% TPO antibody reduction in clinical trials. Targets gut permeability and molecular mimicry antigens driving autoimmune disease.
  • Chronic Pain and Inflammation: The Root Cause Protocol Without NSAIDs — Central sensitization is driven by systemic inflammation, gut dysbiosis, and sleep deprivation. The functional medicine protocol: omega-3 + curcumin + gut repair + sleep optimization produces 20-40% pain reduction in 8-12 weeks.
  • Gut Microbiome and Longevity — How microbiome composition correlates with lifespan and the interventions to optimize it.
  • GERD & Acid Reflux: A Functional Medicine Approach — root-cause approach to acid reflux beyond PPIs.
  • Autoimmune Disease: Leaky Gut & Molecular Mimicry — leaky gut, molecular mimicry, and the 5R protocol.

Sleep & Recovery

Sleep is the highest-leverage health intervention available with no pharmaceutical equivalent.

Cardiovascular Health

Cardiovascular disease is largely preventable with the right biomarker framework and lifestyle protocol.

Brain Health & Cognition

Cognitive function is modifiable. These posts cover the evidence-based approaches to protecting and enhancing brain health across the lifespan.

Start Here: The Foundation Protocol

New to evidence-based health optimization? Start with these four in order: (1) 5 Lab Tests Over 35 to establish your baseline; (2) Vitamin D and Magnesium to correct the most common deficiencies; (3) Zone 2 Training to build the longevity exercise foundation; and (4) the Longevity Stack for the supplement tier once lifestyle is in place.

For a personalized protocol built around your specific labs, symptoms, and goals, call our office at (810) 206-1402 to schedule a functional medicine consultation with Dr. Tom.