The Vitruvian Protocol

System I of XI

Integumentary

Skin, hair & nails

Why it matters

Skin cancer is the most common cancer, and ultraviolet radiation drives most of it. UV also causes most visible skin aging, known as photoaging. Unlike many risks, this one can be blocked almost completely with habits that cost very little.

The protocol

Protocol 1

Wear broad-spectrum SPF 30+ sunscreen every day on exposed skin

Grade A · Strong evidence
How to do it
  • Apply each morning to face, ears, neck, arms and hands. Make it as routine as brushing your teeth, not just a beach habit.
  • Use enough: roughly half a teaspoon for the face and neck. Most people apply a third to half of the tested amount.
  • Reapply every two hours outdoors, and after swimming or heavy sweating.
  • When the UV index is 3 or higher, add shade, a hat and clothing. Sunscreen is the last layer of protection, not the only one.
Why it works
UV filters absorb or scatter UVB and UVA before they can damage DNA in skin cells and break down the collagen that keeps skin firm.
The evidence
In the Nambour randomized trial, adults given sunscreen for daily use developed about half as many new melanomas over 10+ years of follow-up (HR 0.50), with a larger reduction in invasive melanoma (HR 0.27)1. The same trial found 24% less measurable skin aging with daily use compared with occasional use2. The trial used SPF 16. Current dermatology guidance recommends SPF 30 or higher3.

What to measure

  • Sunburns per year0Each blistering sunburn, especially in childhood, adds lasting melanoma risk.
  • Monthly skin self-checkABCDELook for Asymmetry, uneven Borders, mixed Color, Diameter over 6 mm, or any mole that is Evolving. Show anything new or changing to a dermatologist.

Avoid

  • Tanning beds. UV-emitting tanning devices are classified as Group 1 carcinogens, the same category as tobacco4.
  • Smoking. It speeds up wrinkling and slows wound healing.
  • Relying on a "base tan". A tan is itself a sign of UV damage to skin cells and offers little real protection.

Sources

  1. Green AC, Williams GM, Logan V, Strutton GM. Reduced melanoma after regular sunscreen use: randomized trial follow-up. J Clin Oncol. 2011;29(3):257–263. doi.org/10.1200/JCO.2010.28.7078
  2. Hughes MCB, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Ann Intern Med. 2013;158(11):781–790. doi.org/10.7326/0003-4819-158-11-201306040-00002
  3. American Academy of Dermatology. Sunscreen FAQs. www.aad.org/media/stats-sunscreen
  4. El Ghissassi F, Baan R, Straif K, et al. A review of human carcinogens—part D: radiation. Lancet Oncol. 2009;10(8):751–752. doi.org/10.1016/S1470-2045(09)70213-X

Educational content, not medical advice. These protocols summarize published evidence for healthy adults; they are not a substitute for care from a clinician who knows your history. Check with one before starting a new exercise program, changing medication, or if you are pregnant or managing a medical condition.