Natural Ways To Combat Vitamin D Deficiency
Inspired by the Townsend Letter article by Jonathan V. Wright, MD
Vitamin D, once thought to be easily sourced through diet and sunlight, is now facing a modern-day deficiency crisis. As Dr. Jonathan Wright explains in his original piece published in Nutrition & Healing via Townsend Letter, decades of sunscreen overuse, reduced sun exposure, and fear of supplementation have led to the return of vitamin D-related illnesses — including osteoporosis, cancer, and autoimmune conditions.
Sunlight, not just supplements, is nature’s preferred way to restore Vitamin D.
But today’s habits have made even that hard to access.
How We Got Here: From Fortified Foods to SPF Overload
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For years, milk and other foods were fortified with vitamin D to combat rickets. But concerns about overdose led manufacturers to reduce or remove it. At the same time, the rise of sunscreen use (even at SPF 8) blocks 88% of UVB rays — the exact wavelength your skin needs to produce vitamin D naturally.
Add urban living, indoor jobs, and long winters, and it’s no surprise deficiency has surged.
The Health Conditions Linked to Low Vitamin D
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- Bone Health & Osteoporosis Vitamin D is essential for calcium absorption and bone strength. Older adults are most at risk of deficiency, and supplementing is often necessary during winter months or for those over age 35.
- Cancer Studies show that vitamin D may reduce the risk of colon, breast, prostate, and skin cancers by limiting abnormal cell growth. A serum level above 20 ng/mL of 25-hydroxyvitamin D was associated with a 50% reduced risk of colon cancer in one study.
- Autoimmune Diseases & Type 1 Diabetes Higher sunlight exposure and early vitamin D supplementation have been shown to reduce the risk of multiple sclerosis, rheumatoid arthritis, and Type 1 diabetes. One study even found that children given 2,000 IU daily from infancy had an 80% lower risk of developing Type 1 diabetes.
- Psoriasis Relief Vitamin D’s role in skin repair explains its success in psoriasis treatment — whether through UVB exposure or topical vitamin creams (as long as they contain the real compound, not synthetic versions).
How Much Is Enough?
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- Mild sunburn and skin tanning serve as natural signals to limit vitamin D production.
- For those in northern latitudes (above 35°), sunlight exposure may not trigger vitamin D synthesis in winter.
Supplementation Guidelines
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- Adults: 2,000–4,000 IU daily is often safe and effective.
- Children: At least 400 IU daily, though 1,000 IU may be more protective.
- Blood testing (25-hydroxyvitamin D) can confirm your levels and help guide dosage.
Final Thoughts
Vitamin D isn’t just a nutrient — it’s a key to immunity, hormone balance, and cellular health. And it’s one of the few nutrients the body can make itself — if given the right environment.
Take Charge of Your Health
Meridian Valley Lab offers vitamin D blood spot testing as part of several comprehensive hormone and nutrient panels. Whether you’re concerned about bone health, fatigue, or immune support, our tests can help you get the answers you need.
