Episode #13 of 12: Know This Number — Low Vitamin D Causes Fatigue & Inflammation (Ep. 12)

In this finale, Dr. Don Colbert joins Mary and Kyle to spotlight the most impactful, low-cost lever for immune strength and vitality: Vitamin D. From preventing winter slumps to dialing down inflammation, optimizing your 25-OH Vitamin D is one of the smartest moves you can make for year-round health.

Shop Vitamin D3 in Immune Support
Shop Vitamin K2🔑 What You’ll LearnWhy Vitamin D is a master regulator of the immune system and inflammation.How optimized levels help reduce fatigue, protect brain function, and support bones, teeth, and muscle.Real-world dosing nuances: age, latitude/season, body fat, and skin tone.Food sources vs sunlight vs supplementation (and why D3 outperforms D2).Safety guardrails: when “too much” becomes a problem and how to monitor.🧪 The Number to Know (Labs & Targets)25-OH Vitamin D (ng/mL) — most accurate routine test.
• Dr. Colbert’s optimized range: 50–80.Why it matters — Optimized D helps lower inflammatory cytokines (e.g., TNF-α, IL-6), boosts anti-inflammatory IL-10, and down-regulates NF-κB signaling.Pairs well with — Vitamin K2 (guides calcium to bones/teeth), DIM (breast/prostate support), and adequate calcium intake.

Ask for a 25-OH Vitamin D blood test, then supplement to reach 50–80 and re-test in ~8–12 weeks.

🧠 Brain, Bones, & ImmunityBrain health: receptors in the hippocampus and prefrontal cortex; supports neurogenesis, synapse formation, and lowers oxidative stress.Bones/teeth/muscle: improves calcium & phosphorus absorption; prevents osteomalacia; supports growth in children and maintenance in older adults.Immune defense: helps reduce severity of viral illnesses; particularly important for elderly and those with low baseline levels.💊 D3 vs D2 & DosingChoose D3: more effective than D2 for raising 25-OH D.Typical intakes: many do well at 2,000 IU/day; some require 5,000 IU/day; individuals with obesity may need 10,000 IU/day (monitor with labs).Sunlight: synthesis declines with age (~50% lower by ~70 years), higher latitudes, winter, darker skin tones, and covered clothing.Food: wild salmon (~1,400 IU in 4 oz) ≫ farmed (~15% of that); many foods are only lightly fortified.⚠️ Safety NotesRe-check after dose changes; watch calcium. Vitamin D > 100 ng/mL is generally excessive; >150 = hypervitaminosis D risk.If calcium runs high (>10.5–11 mg/dL), consider parathyroid evaluation (PTH) with your clinician.✅ Quick Action PlanOrder a 25-OH Vitamin D test.Supplement with D3 (consider D3 + K2), adjust dose to hit 50–80 ng/mL.Prioritize outdoor time when possible; maintain protein/mineral intake (calcium, magnesium, phosphorus).Re-test in 8–12 weeks and adjust.✝ Faith & Health

Steward the body God gave you. Small daily habits—testing, supplementing wisely, getting sunlight—compound into resilience for decades.

📚 Helpful LinksShop Vitamin D3 in Immune Support
Shop Vitamin K2
Shop DIM in Hormone Zone

Medical disclaimer: Educational content only. Not a substitute for personalized medical advice. Consult your healthcare professional before making changes to medications or supplements.

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