Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
The Connection Between Vitamin D and Foot Health
Vitamin D is far more than just a “bone vitamin.” It plays critical roles in muscle function, tendon health, immune regulation, and the prevention of stress fractures — all of which directly impact foot and ankle health. Research published in the past decade has identified vitamin D deficiency as a contributing factor in conditions ranging from plantar fasciitis to chronic Achilles tendinopathy to stress fractures.
At Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, we increasingly incorporate vitamin D assessment into our evaluation of patients with recurrent foot problems — because deficiency may be silently undermining their recovery.
How Common Is Vitamin D Deficiency?
Vitamin D deficiency (serum 25-hydroxyvitamin D below 20 ng/mL) affects an estimated 35–42% of American adults. In Michigan and other northern states, deficiency is even more prevalent — particularly between October and April when sunlight is insufficient for skin-based vitamin D synthesis. Risk factors include: dark skin pigmentation, indoor lifestyle, obesity (vitamin D is fat-soluble and sequestered in adipose tissue), older age, malabsorption conditions, and chronic kidney disease.
Vitamin D and Plantar Fasciitis
Multiple studies have found significantly lower vitamin D levels in patients with plantar fasciitis compared to healthy controls. The proposed mechanisms include:
- Vitamin D receptors are expressed in tendon and fascia — deficiency impairs collagen synthesis and repair
- Vitamin D modulates inflammatory cytokines — deficiency promotes a pro-inflammatory environment that sustains fascia inflammation
- Muscle weakness from vitamin D deficiency alters gait mechanics and increases fascial load
A 2017 study in the Journal of Research in Medical Sciences found that vitamin D supplementation significantly improved plantar fasciitis outcomes when combined with standard care. While not a standalone treatment, correcting deficiency may accelerate recovery and reduce recurrence rates.
Vitamin D and Stress Fractures
Vitamin D is essential for calcium absorption and bone remodeling. Deficiency results in lower bone mineral density (BMD), impaired periosteal bone deposition, and reduced ability to repair stress-related microdamage. Athletes and military recruits with vitamin D deficiency have 2–4x higher stress fracture rates compared to vitamin D-sufficient peers. For runners with recurrent metatarsal stress fractures, vitamin D testing should be part of the evaluation.
Vitamin D and Muscle Function
Vitamin D deficiency causes proximal muscle weakness, fatigue, and myalgia (muscle aching). In the lower extremity, this can manifest as leg fatigue with walking, calf cramps, and reduced proprioception — all of which affect gait mechanics and increase foot and ankle injury risk. Aggressive athletes may experience a plateau in performance that doesn’t respond to training — vitamin D deficiency can be a contributing factor.
Vitamin D and Achilles Tendinopathy
Emerging research suggests vitamin D plays a role in tendon collagen quality and repair. Patients with chronic Achilles tendinopathy have been found to have lower vitamin D levels than matched controls. Whether correction of deficiency accelerates tendon healing remains an active research question, but given the low risk of supplementation, optimizing levels in patients with stubborn tendinopathy is reasonable practice.
Testing and Optimal Levels
Vitamin D status is assessed by measuring serum 25-hydroxyvitamin D (25-OHD):
- Below 20 ng/mL: Deficient
- 20–29 ng/mL: Insufficient
- 30–50 ng/mL: Sufficient for most adults
- 50–80 ng/mL: Optimal range suggested for musculoskeletal health in many studies
- Above 100 ng/mL: Potentially toxic (though true toxicity requires sustained very high supplementation)
Ask your primary care physician for a 25-OHD level at your next visit, especially if you have recurrent foot problems, live in Michigan, or have risk factors for deficiency.
Vitamin D Supplementation Guidelines
For deficient adults, therapeutic dosing typically begins at 2,000–5,000 IU daily of vitamin D3 (cholecalciferol — the most bioavailable form). Re-check levels in 3 months. Maintenance dosing for most adults in northern states: 1,500–2,000 IU daily. Take with the fattiest meal of the day for optimal absorption (vitamin D is fat-soluble). Vitamin K2 (MK-7 form) is often co-administered to direct calcium to bones rather than soft tissue.
Food Sources of Vitamin D
Diet provides limited vitamin D for most people, but helpful sources include: fatty fish (salmon, mackerel, sardines), egg yolks, beef liver, and fortified foods (milk, orange juice, certain cereals). Sunlight exposure (15–20 minutes of midday summer sun on face and arms) produces 10,000+ IU — but Michigan winters make sunlight-dependent vitamin D production unreliable for 6 months per year, making supplementation practical.
What to Do If You Suspect Deficiency
If you have recurrent plantar fasciitis, stress fractures, or chronic foot problems that aren’t responding to standard care, ask your podiatrist or primary care physician to check your 25-OHD level. At Balance Foot & Ankle, we discuss nutritional factors in the context of your foot health and can coordinate with your primary care physician for comprehensive management.
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When to See a Podiatrist for Bone Health
Vitamin D deficiency is widespread in Michigan due to limited sun exposure and directly impacts bone strength in the feet. Dr. Tom Biernacki at Balance Foot & Ankle evaluates patients with stress fractures and chronic foot pain for nutritional factors that may be contributing to their condition.
Learn About Our Fracture Treatment Options | Book Your Appointment | Call (810) 206-1402
Clinical References
- Holick MF. “Vitamin D deficiency.” New England Journal of Medicine. 2007;357(3):266-281.
- Lappe J, et al. “Calcium and vitamin D supplementation decreases incidence of stress fractures in female Navy recruits.” Journal of Bone and Mineral Research. 2008;23(5):741-749.
- Angeline ME, et al. “The effects of vitamin D deficiency in athletes.” American Journal of Sports Medicine. 2013;41(2):461-464.
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Howell, MI 48843
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Hoka Clifton 10
Max-cushion everyday shoe — podiatrist favorite for walking and running.
OOFOS Recovery Slide
Impact-absorbing recovery sandal — wear after long days on your feet.
As an Amazon Associate, Balance Foot & Ankle earns from qualifying purchases. Product recommendations are based on clinical experience; prices and availability shown above update live from Amazon.
When to See a Podiatrist
If foot or ankle pain has been bothering you for more than a few weeks, home care alone may not be enough. Balance Foot & Ankle offers same-week appointments at our Howell and Bloomfield Hills clinics — no referral needed in most cases. Bring your current shoes and a short list of symptoms and we’ll build you a treatment plan in one visit.
Call Balance Foot & Ankle: (810) 206-1402 · Book online · Offices in Howell & Bloomfield Hills
Dr. Hoy’s Complete Pain Relief Line — Dr. Tom’s Picks (2026)
Dr. Hoy’s Natural Pain Relief is Dr. Tom Biernacki, DPM’s #1 prescription topical pain relief for plantar fasciitis, Achilles tendonitis, foot pain, knee pain, and back pain. Cleaner formula than Voltaren or Biofreeze — safe for diabetics + daily long-term use without 30-day limits. Below is the complete Dr. Hoy’s product line, organized by use case.
Dr. Hoy’s Natural Pain Relief Gel (4oz Tube)Dr. Tom’s #1 Brand
The flagship Dr. Hoy’s — menthol-based natural pain relief gel. The bottle Dr. Tom hands every plantar fasciitis patient on visit one. Cleaner formula than Voltaren or Biofreeze.
- Menthol-based natural formula
- No greasy residue
- Safe for diabetics
- Fast cooling relief 5-10 min
- Daily long-term use safe
- Pricier than Biofreeze
- Strong menthol scent at first
Dr. Hoy’s Natural Pain Relief Gel (8oz Pump Bottle)Dr. Tom’s #1 Brand
8oz pump bottle — same formula as the 4oz tube but 2x the value. Best for athletes, families, or chronic pain patients who use it daily.
- 8oz pump bottle
- 2x value of 4oz
- Same clean formula
- Easy pump dispensing
- Larger size
- Pricier upfront
Dr. Hoy’s Arnica Boost Pain ReliefDr. Tom’s #1 Brand
Dr. Hoy’s + arnica boost — for bruising, swelling, post-injury inflammation. Adds arnica’s anti-inflammatory power to the standard menthol formula.
- Added arnica for bruising
- Reduces post-injury swelling
- Fast topical relief
- Safe for athletes
- Specialty use
- Pricier than standard
Dr. Hoy’s Natural Pain Relief Roll-OnDr. Tom’s #1 Brand
Same Dr. Hoy’s formula in a roll-on stick — no greasy hands, no mess, perfect for gym bags and travel. TSA-friendly.
- No greasy hands
- TSA-friendly
- Travel-sized
- Same Dr. Hoy’s formula
- Less product per use
- Pricier per oz
Dr. Hoy’s Pain Relief Gel — 3-Pack BundleDr. Tom’s #1 Brand
3-pack of Dr. Hoy’s 4oz tubes — best per-tube price for chronic pain patients, families, or anyone who uses it daily.
- 3-pack bulk pricing
- Same flagship formula
- Stockpile value
- Family-sized
- Larger upfront cost
- Need storage space
Top 10 Premade Orthotics — Dr. Tom’s Picks (2026)
Dr. Tom Biernacki, DPM has tested 60+ over-the-counter orthotic insoles in his Michigan podiatry practice over the past 15 years. Below are the top 10 he prescribes most often — ranked by clinical results, build quality, and patient feedback. PowerStep + CURREX brands are Dr. Tom’s #1 prescription brands — built by podiatrists, with biomechanical features (lateral wedge, deep heel cradle, dual-density EVA) that 90% of OTC insoles lack.
Dr. Tom Biernacki, DPM is a board-certified podiatrist + Amazon Associate. Picks shown are products he prescribes to patients at Balance Foot & Ankle Specialists. We earn a commission on qualifying purchases at no extra cost to you. All products independently tested + reviewed. Last verified: April 28, 2026.
PowerStep Pinnacle MaxxDr. Tom’s #1 Brand
The most prescribed OTC orthotic in podiatry. Lateral wedge corrects overpronation that causes 90% of plantar fasciitis. Deep heel cradle stabilizes the ankle.
- Lateral wedge corrects pronation
- Deep heel cradle
- Dual-density EVA
- Trim-to-fit
- Used by 10,000+ podiatrists
- Trim required
- 5-7 day break-in
PowerStep Original Full LengthDr. Tom’s #1 Brand
The original PowerStep — flexible semi-rigid arch with deep heel cradle. The right choice for neutral feet that need everyday support without the lateral wedge.
- Flexible semi-rigid arch
- Deep heel cradle
- Fits dress shoes
- 30-day guarantee
- APMA-accepted
- Less aggressive than Pinnacle
- No lateral wedge for overpronation
PowerStep Pulse MaxxDr. Tom’s #1 Brand
Built for runners + athletes who need maximum support during high-impact activity. Engineered for forefoot strike + lateral motion.
- Sport-specific cushioning
- Lateral wedge for runners
- Antimicrobial top cover
- Shock-absorbing forefoot
- Pricier than Pinnacle
- Best for athletes only
CURREX RunProDr. Tom’s #1 Brand
German-engineered insole with 3 arch heights (Low, Med, High) for custom fit. Carbon-reinforced heel + dynamic forefoot.
- 3 arch heights for custom fit
- Carbon-reinforced heel
- Sport-specific zones
- Premium materials
- Pricier than PowerStep
- 7-10 day break-in
CURREX EdgeProDr. Tom’s #1 Brand
For hikers, skiers, and high-impact athletes — reinforced shank prevents foot fatigue on steep descents + uneven terrain.
- Reinforced shank
- 3 arch heights
- Cold-weather friendly
- Carbon plate
- Stiff feel — not for casual
- Pricier
CURREX SupportSTPDr. Tom’s #1 Brand
For nurses, retail, and standing professions — the most supportive CURREX with deep heel cup + maximum medial support.
- Maximum medial support
- Deep heel cup
- 12-hour shift tested
- Slip-proof
- Stiffest CURREX option
- Pricier
PowerStep Pinnacle
Firm, structured arch support — the right choice ONLY for high-arched (cavus) feet. Wrong choice for flat feet.
- Strong structured arch
- Deep heel cup
- Long-lasting (5+ years)
- Firm — not for flat feet
- No lateral wedge
Vionic OrthoHeel Active Insole
APMA-accepted, podiatrist-designed casual insole. Best for adding mild arch support to dress shoes + walking shoes.
- APMA-accepted
- Slim profile
- Antimicrobial top
- Less support than PowerStep
- No lateral wedge
Sof Sole Athlete
Budget athletic insole with neutral arch + gel forefoot. Decent value if you need a quick replacement.
- Affordable
- Gel forefoot
- Antimicrobial
- Wears out in 6 months
- No structured arch
Spenco Polysorb Total Support
Mid-range insole with 5-zone polysorb cushioning. Decent support for standing professions.
- 5-zone cushioning
- Trim-to-fit
- Mid-price point
- Less stable than PowerStep
- No lateral wedge
Dr. Tom’s Top 3 — The Premium Foot Pain Stack (2026)
If you only buy three things for foot pain, get these. PowerStep + CURREX orthotics correct the underlying foot mechanics, and Dr. Hoy’s pain gel delivers fast topical relief. This is the exact stack Dr. Tom Biernacki, DPM gives his Michigan podiatry patients on visit one — over 10,000 patients have used this exact combination.
Dr. Tom Biernacki, DPM is a board-certified podiatrist + Amazon Associate. Picks shown are products he prescribes to patients at Balance Foot & Ankle Specialists. We earn a commission on qualifying purchases at no extra cost to you. All products independently tested + reviewed for 30+ days minimum. Last verified: April 28, 2026.
PowerStep Pinnacle MaxxDr. Tom’s #1 Brand
Dr. Tom’s most-prescribed OTC orthotic. Lateral wedge corrects overpronation that causes 90% of foot pain. Deep heel cradle stabilizes the ankle. Built by podiatrists, used by patients worldwide.
- Lateral wedge corrects pronation
- Deep heel cradle stabilizes ankle
- Dual-density EVA — comfort + support
- Trim-to-fit any shoe
- Used by 10,000+ podiatrists
- Trim-to-size required
- 5-7 day break-in for some
CURREX RunProDr. Tom’s #1 Brand
3 arch heights for custom fit (Low/Med/High). Carbon-reinforced heel + dynamic forefoot — the closest OTC orthotic to a $500 custom orthotic. Engineered in Germany.
- 3 arch heights for custom fit
- Carbon-reinforced heel cup
- Dynamic forefoot zone
- Premium German engineering
- Sport-specific support
- Pricier than PowerStep
- 7-10 day break-in
Dr. Hoy’s Natural Pain Relief GelDr. Tom’s #1 Brand
Menthol-based natural pain relief — Dr. Tom’s #1 brand for fast relief without greasy residue. Safe for diabetics + daily use. Cleaner formula than Voltaren or Biofreeze.
- Menthol-based natural formula
- No greasy residue
- Safe for diabetics
- Fast cooling relief — 5-10 minutes
- Cleaner ingredient list than Biofreeze
- Pricier than Biofreeze
- Strong menthol scent at first
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Plantar Fasciitis: Diagnosis and Conservative Management (PubMed)
- Plantar Fasciitis (APMA)
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)