Why Vitamin D Matters for Concussion Recovery Vitamin D deficiency is widespread and worsens after concussion. Up to 70% of PCS patients show vitamin D insufficiency, often worse than pre-injury due to reduced sun exposure during recovery. The reduced activity and indoor time during recovery accelerates vitamin D depletion. The deficiency contributes to slower healing, worse mood symptoms, and impaired neurological function (Patricios et al., 2023). Vitamin D supports brain function directly. Vitamin D receptors are present throughout the brain. The vitamin supports neurotransmitter synthesis, neural inflammation regulation, and cognitive function. Adequate levels support the brain recovery PCS requires; deficient levels limit recovery potential. Vitamin D supports mood regulation. Deficiency correlates with depression and anxiety in research. PCS patients face elevated depression risk; vitamin D adequacy supports mood during the difficult recovery period. K2 (MK-7) should accompany D3. Vitamin D increases calcium absorption. K2 directs the absorbed calcium to bones rather than soft tissues. The combined supplementation supports bone health (important during reduced activity) and prevents arterial calcification that high-dose D alone may promote. Best Overall: Pure Encapsulations Vitamin D3/K2 5000 IU Website: pureencapsulations.com Price: ~$30-38 for 120 capsules Pure Encapsulations combines 5000 IU vitamin D3 with 180 mcg K2 (MK-7) in their characteristic hypoallergenic formulation. The clinical-dose K2 (at the upper research range) provides robust calcium handling support. The clean formulation suits chemically sensitive patients (common after concussion). Pure Encapsulations is practitioner-grade with 3rd party testing. What makes it stand out: 5000 IU D3 with 180 mcg K2 (clinical research dose) Hypoallergenic formulation Free from common allergens and artificial additives Practitioner-grade brand 3rd party tested 120 capsule bottle (4 month supply) Limitations: Premium pricing. Higher D3 dose may exceed some patients' needs (test 25(OH)D first). Less retail availability. Capsule form (not appropriate for patients who cannot swallow capsules). Best for: Patients with confirmed vitamin D deficiency who need clinical-dose supplementation with clean formulation. Particularly appropriate for chemically sensitive patients. Best Tested: Thorne Vitamin D + K2 Liquid Website: thorne.com Price: ~$22-28 for 1 oz dropper Thorne provides D3 (1000 IU per drop) plus K2 (MK-4 type) in an MCT oil liquid formulation. The liquid format allows precise dose titration and faster absorption than capsules. The NSF Certified for Sport testing verifies purity. The dropper format works for patients who cannot swallow capsules. What makes it stand out: Liquid format (precise dose titration) 1000 IU D3 per drop (easy to adjust) K2 MK-4 form included MCT oil base supports absorption NSF Certified for Sport No artificial additives 1 oz bottle provides 600+ drops Limitations: MK-4 (rather than MK-7) form has shorter half-life. Requires daily dosing rather than less frequent. Liquid format requires refrigeration after opening. The dropper format is less convenient for travel. Less concentrated K2 than some competitors. Best for: Patients who need precise dose titration, cannot swallow capsules, or want NSF certification for verified purity. Best K2 Form: Designs for Health Vitamin D Supreme Website: designsforhealth.com Price: ~$50-65 for 120 capsules Designs for Health combines 5000 IU D3 with 600 mcg K2 (MK-7 plus K1). The high K2 content (above standard formulations) provides robust calcium handling and bone support. The K1 addition supports vascular health. The premium formulation targets patients with significant deficiency or complex supplementation needs. What makes it stand out: 5000 IU D3 with 600 mcg K2 (high-dose K2) Includes K1 in addition to K2 MK-7 Practitioner-grade brand 120 capsule bottle Comprehensive vitamin K complex 3rd party tested Limitations: Highest price in this category. The high K2 dose exceeds most patients' needs. Limited retail availability. The capsule contains the high dose without titration options. Premium pricing for comprehensive formulation that may exceed individual needs. Best for: Patients with documented vitamin D and K deficiency, or those with bone health concerns alongside concussion recovery. The premium formulation suits complex supplementation needs. Best Clinical Brand: Metagenics D3 5000 + K Website: metagenics.com Price: ~$28-35 for 120 softgels Metagenics combines 5000 IU D3 with 90 mcg K2 (MK-7) in a softgel format with olive oil base. The clinical positioning targets healthcare providers and integrative medicine practices. The softgel format provides good absorption with simple administration. The brand is widely used in integrative medicine clinics. What makes it stand out: 5000 IU D3 with 90 mcg K2 MK-7 Softgel format with olive oil base Widely used in integrative medicine cGMP manufactured 3rd party tested 120 softgel bottle Limitations: Softgel may contain gelatin (not vegetarian). Lower K2 dose than Pure Encapsulations or Designs for Health. Less premium positioning than Thorne or Pure Encapsulations. Less retail availability. Best for: Patients working with integrative medicine providers who use Metagenics, or those wanting solid clinical-grade D3/K2 without paying premium pricing. Best Budget: Nordic Naturals Vitamin D3 5000 Website: nordicnaturals.com Price: ~$15-22 for 120 softgels Nordic Naturals provides D3 5000 IU in softgel format with olive oil base. Note: this formulation does not include K2 (separate purchase needed if K2 supplementation desired). The straightforward D3-only formulation works for patients who don't need combined K2 or who already get K2 from other sources. What makes it stand out: 5000 IU D3 in softgel format Olive oil base for absorption Established brand (Nordic Naturals known for fish oil quality) Affordable pricing Non-GMO 3rd party tested Wide retail availability Limitations: Does not include K2 (need separate K2 supplement). Softgel contains gelatin. Single-dose strength (no titration). Less premium positioning than practitioner brands. Best for: Budget-conscious patients who get adequate K2 from diet (leafy greens, fermented foods) or who want to add K2 separately. Also useful as basic D3 baseline before combining with separate K2. How to Choose the Right Vitamin D Supplement Your choice depends on whether you need combined K2, dose preference, and budget. Confirmed D deficiency (25(OH)D under 30 ng/mL): Pure Encapsulations D3/K2 5000 ($30-38) for clinical-dose with K2 Designs for Health Vitamin D Supreme ($50-65) for high K2 Maintenance after deficiency correction: Metagenics D3 5000 + K ($28-35) for clinical maintenance Reduce to 2000-3000 IU based on follow-up testing Want precise dose titration: Thorne Vitamin D + K2 Liquid ($22-28) Already get K2 from diet: Nordic Naturals Vitamin D3 5000 ($15-22) for D-only Budget priority: Nordic Naturals Vitamin D3 5000 ($15-22) Add separate K2 if needed ($15-25 for 6 months) How to Use Vitamin D for PCS Recovery Test 25(OH)D before starting. Baseline testing identifies whether you need correction (under 30 ng/mL) or maintenance (30-50 ng/mL) or no supplementation. Most patients need testing; some are deficient without obvious symptoms. Take with fatty food. Vitamin D is fat-soluble. Absorption increases 30-50% when taken with meals containing fat. Skip empty-stomach dosing. Daily dosing more effective than weekly. Some clinicians prescribe 50,000 IU weekly. Research supports daily 2000-5000 IU as more effective for blood level maintenance. Daily is the better protocol. Retest after 8-12 weeks. Adjust dose based on retesting. Target 40-60 ng/mL for most patients during recovery. Higher levels may benefit specific patients but require provider guidance. Continue indefinitely if at risk. Vitamin D deficiency is endemic in most populations. Continued supplementation maintains adequate levels. Discontinuation typically returns to deficient state. Supporting Mobility Routine Vitamin D supports cellular function. These exercises support the cervical and autonomic function that affect recovery. JME 155 Diaphragmatic breathing supports autonomic regulation. 10 breaths every 60-90 minutes. JME 14 Chin tucks address cervical contribution to PCS. 10 repetitions with 5-second holds. JME 1 Cervical rotation maintains cervical function. 10 repetitions each direction. JME 150 Thoracic rotation supports breathing. 8 repetitions per direction. Start your 3-day free trial for mobility programs supporting concussion recovery. Common Mistakes With Vitamin D Supplementing without testing. Most patients need testing to guide dosing. Some need correction doses; others maintenance; some may have adequate levels. Test first, then dose. Skipping K2. High-dose D without K2 can promote arterial calcification over time. Combine D with K2 (MK-7 preferred) for most patients. Taking without fat. Empty-stomach D absorption is poor. Always take with meals containing fat. Mega-dosing. Doses above 10,000 IU daily produce diminishing returns and potential toxicity. Stay in 2000-5000 IU range unless provider directs higher under monitoring. Stopping when feeling better. Vitamin D need persists. Stopping returns levels to deficient state within months. Continue maintenance dosing. How much vitamin D should I take after concussion? Depends on baseline level. 2000-5000 IU daily covers most patients with mild-to-moderate deficiency. Severe deficiency may need higher correction doses (10,000 IU under provider guidance). Test guides individual dose. Can I get enough vitamin D from sunlight during recovery? Generally no. PCS recovery typically reduces outdoor time. Even with normal sun exposure, geographic location, season, and skin tone affect vitamin D synthesis substantially. Supplementation is appropriate for most PCS patients. Will vitamin D help my concussion symptoms specifically? If deficient: yes, by supporting brain function and mood. If adequate: limited additional benefit. The test result determines whether supplementation is supporting recovery or just maintaining status. References Patricios, J. S., et al. (2023). Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. British Journal of Sports Medicine, 57(11), 695-711. PubMed Silverberg, N. D., et al. (2020). Management of concussion and mild traumatic brain injury: a synthesis of practice guidelines. Archives of Physical Medicine and Rehabilitation, 101(2), 382-393. PubMed