{
  "id": "spf",
  "idVersion": 1,
  "ingredient": "Sunscreen / SPF",
  "route": "topical",
  "grade": "strong",
  "gradeLabel": "Strong",
  "claim": "One of the best-studied things you can do in relation to keeping skin looking younger over time. The prevention step that’s hard to beat.",
  "caveat": null,
  "published": "2026-09-19",
  "sources": [
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/23732711/",
      "journal": "Annals of Internal Medicine",
      "year": 2013,
      "n": null,
      "design": "Randomized controlled trial",
      "duration": "4.5 years",
      "percentages": [
        "24%",
        "95% CI 0.59–0.98"
      ],
      "outcome": "skin aging",
      "finding": "RCT, 4.5 years: daily-sunscreen group showed 24% less skin aging than discretionary use (OR 0.76, 95% CI 0.59–0.98).",
      "formulation": "broad-spectrum SPF 15+, daily"
    }
  ],
  "peopleReport": null
}