How deep is the trial record for sunscreen, and what do FDA and CDC say
PubMed holds 321 randomized-trial papers on sunscreen, and FDA and CDC agree on the basics: broad spectrum, SPF 15 or higher, and one step among several.
On 30 October 2026, PubMed held 321 randomized-trial papers on sunscreen. FDA, on a page current as of 16 October 2026, says no sunscreen is waterproof and to reapply at least every two hours. These counts show depth of record, not protection for you.
PubMed counts read 30 October 2026 and ClinicalTrials.gov 2 November 2026; FDA and CDC statements from pages read 2 November 2026.
131KEnglish Wikipedia views a yearattention, beside a deep record
Sunscreen: claims against the recordwhat gets said, and what the record shows, read 30 October 2026
They sayMy sunscreen is waterproof, so I can skip reapplying.
Not that simple
FDA says there is no such thing as waterproof sunscreen, and to reapply at least every two hours, and more often if sweating or swimming. See the receipt
They sayAny sunscreen protects against skin cancer.
Not that simple
FDA says products that are not broad spectrum or lack SPF 15 must say they have been shown only to help prevent sunburn, not skin cancer or early skin aging. See the receipt
They saySunscreen alone is enough.
Not that simple
FDA says to use sunscreen in combination with other sun protective measures, and CDC says it works best combined with options like clothing and hats. See the receipt
What do FDA and CDC say sunscreen is for?
FDA says broad spectrum sunscreens help protect against both forms of UV radiation, UVA and UVB.[1]CDC says to use a broad-spectrum sunscreen with SPF of 15 or higher.[2]
On the evidence ladder, sunscreen ranks fourth of nine topics for trial depth, and the Copium Meter's hype-versus-trials view is on the sunscreen page.
Papers typed as randomized controlled trials, and as systematic reviews or meta-analyses, for the evidence ladder's sunscreen query, read 30 October 2026. Counts of tagged papers, not effect or quality.
The tag is PubMed's own publication type.[4] Compare that with BPC-157, which has none typed as such, and see the evidence ladder for the full comparison, though a count says nothing about who was studied or how large any effect was.
Every PubMed paper matching the query, whatever its type, beside the trial-typed slice: about 4 percent.
What else is registered?
ClinicalTrials.gov lists 361 interventional studies matching sunscreen.[5] A registration is a plan on file, and we have not assessed any of them.
Interventional studies matching sunscreen, read 2 November 2026. A registration is a plan on file, not a finished or positive result, and we have not assessed any of them.
What does FDA say about labels and reapplying?
FDA says products that are not broad spectrum, or lack an SPF of at least 15, must carry a warning that they have been shown only to help prevent sunburn, not skin cancer or early skin aging.[1] It says there is no such thing as waterproof sunscreen.
How to read a sunscreen claim
1. Is it broad spectrum, and is the SPF 15 or higher? FDA's label rule turns on both.
2. "Waterproof" is not a thing. FDA says so.
3. Sunscreen is one step of several, per FDA and CDC.
4. Check the label for the sunburn-only warning.
5. Skin cancer worries: a dermatologist decides.
It also says to reapply at least every two hours, and more often if you are sweating or swimming, and that sunscreen is not recommended for infants under six months old.
What else does CDC say to do?
CDC lists staying in the shade, wearing long sleeves and long pants or skirts when possible, a hat with a brim all the way around, and sunglasses that protect your eyes and the skin around them.[2]
The steps as CDC lists them. Sunscreen is the last box, and both FDA and CDC say it works best combined with the others.
FDA says Americans should use sunscreen in combination with other sun protective measures.[1] Whether any of this changes for your own skin is a question for a dermatologist.
This page measures only the first box and quotes the second. The last two are where a clinician or dermatologist earns the fee.
How should you use this page?
If you are weighing a sunscreen claimDepth of record: deepSunscreen has a real trial record, and FDA and CDC agree on the basics. A count cannot tell you what it will do for your skin. Whether it suits you is a question for a clinician.
If you are reading a product labelLabel: check broad spectrum and SPF 15Products that are not broad spectrum or lack SPF 15 carry a sunburn-only warning. Read it before the marketing.
If you plan to be outside a long timePlan: layers, not one stepFDA and CDC both say sunscreen works with shade, clothing, hats and sunglasses, not instead of them.
How this page was built
Method
PubMed counts are the evidence ladder's own for sunscreen use, read 30 October 2026, and ClinicalTrials.gov interventional studies matching the stated terms, read 2 November 2026. FDA statements are quoted or closely paraphrased from its page (current as of 16 October 2026) and CDC statements from its page (dated 17 June 2026), both read in full on 2 November 2026. FDA's page states the sunburn-only warning for products that are not broad spectrum or lack SPF 15, and we report that rather than a broader claim it does not make.
Queries are broad and will include off-topic papers, and publication-type tags can be loose, so treat the counts as depth of record (our grading rules are on the methodology page, and every comparison lives on the ladder hub). Nothing here measures effect size or study quality, covers product amounts or brands, or is medical advice.
The exact query
PubMed: (sunscreen[tiab] OR sunscreens[tiab])
ClinicalTrials.gov: sunscreen OR sunscreens, interventional studies
References
abc FDA. Sunscreen: how to help protect your skin from the sun (content current as of 16 October 2026). fda.gov, read 2 November 2026.
ab CDC. Sun safety facts (page dated 17 June 2026). cdc.gov, read 2 November 2026.
↑ PubMed search on sunscreen with publication-type filters (the evidence ladder's query, printed in the method section). pubmed.ncbi.nlm.nih.gov, read 30 October 2026.
↑ National Library of Medicine. MeSH publication type: Randomized Controlled Trial. ncbi.nlm.nih.gov.
↑ ClinicalTrials.gov interventional studies matching sunscreen, read 2 November 2026. clinicaltrials.gov, read 2 November 2026.
FAQ
How many randomized trials are there on sunscreen?
PubMed held 321 papers typed as randomized controlled trials and 98 systematic reviews or meta-analyses for the evidence ladder's sunscreen query on 30 October 2026.
Is any sunscreen waterproof?
FDA says there is no such thing as waterproof sunscreen, and to reapply at least every two hours, and more often if you are sweating or swimming.
What SPF does CDC recommend?
CDC says to use a broad-spectrum sunscreen with SPF of 15 or higher, as one step alongside shade, clothing, a hat and sunglasses.
Does a high trial count mean it protects me?
No. It means the record is deep. Effect size, study quality and your own skin and sun exposure are separate questions for a clinician.
Bottom line
Sunscreen has a deep trial record, and FDA and CDC agree it is one step among several, with no such thing as waterproof. Use the count to see that the record exists, then ask a dermatologist about your skin.