Audit a URL →

Sign in Sign up free

Loading…

Weekly · Sunday Morning

Five longevity claims.
Worth your time.
Every Sunday.

Last Sunday

Rapamycin extends mouse lifespan 9–14%
NAD+ precursors reverse aging in humans
Blue-light glasses improve sleep quality
Walking 10 min after meals blunts glucose
Verdict change — caffeine half-life downgraded

5 audits·1 verdict change·0 affiliate links·Every Sunday

Joining 1,247 readers — founders, MDs, and longevity-obsessed people who fact-check their own health decisions.

Browse

Decisions Claims Content Creators

Product

Audit a URL Sunday roundup API (soon)Pricing

About

FAQ Methodology Editorial Standards Corrections Press & brand RSS feed

Legal

Terms of Service Privacy Policy DMCA

Finally, something serious in this space.
Because we actually read the papers.

© 2026 Whalespan. Independent, evidence-graded longevity.

Avoid These Ingredients in Sunscreen — Whalespan

Content›Video›Avoid These Ingredients in S…

Avoid These Ingredients in Sunscreen

Paul Saladino6m · 2025-07-07

Claims Made

18

Claims Supported

15

Support Rate

83%

Support rate

15 of 18 claims supported

15 supported3 partial / not

Claims from this content

16

✓Well SupportedSunlight exposure is essential for optimal vitamin D production, circadian rhythm entrainment, and nitric oxide production in the skin.✓Well SupportedEndorphins are produced when humans are exposed to sunlight, suggesting an evolutionary mechanism for sun-seeking behavior.✓Well SupportedExposure to UVA light increases nitric oxide production in skin cells for up to 48 hours, benefiting blood vessel health.◐Partially SupportedSunlight entering the eyes is necessary for entraining circadian rhythms by stimulating photoreceptors.Partially Supported

Discussion

Native comments, Twitter mentions, and Reddit threads about this content — surfaced together so the conversation isn't fragmented across platforms.

M

Share your read of this content…

Posting publicly as you · linked to your social profiles

Sort by:

AV

A. Volkovreader

4h

Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

NP

N. Park

2d

Would love a "what would change this verdict" RSS feed. Sign me up if it exists.

◐

Vitamin D is a hormone with significant roles in gene expression and overall human health.

◐Partially SupportedHumans generally possess an intrinsic sense of when they have had sufficient sun exposure.

◐Partially SupportedVitamin D levels can be used as a metric to determine appropriate sun exposure, especially if not supplementing with vitamin D.

✕Not SupportedAvoiding the sun entirely is a disconnect from human physiological needs.

◐Partially SupportedNon-nano zinc oxide mineral sunscreens are the best option for most people seeking sun protection.

✕Not SupportedMainstream chemical sunscreens containing octabenzone, oxybenzone, avobenzone, ecamsule, and octocrylene are likely endocrine disruptors and should be used with caution.

◐Partially SupportedVitamin D is critically important for human health.

◐Partially SupportedMorning sunlight is preferable for pale individuals as it contains fewer UVA and UVB rays and helps program the circadian rhythm.

◐Partially SupportedHumans require direct sunlight for a significant portion of the day for overall wellness.

◐Partially SupportedThe amount of sunlight needed for vitamin D production varies by skin tone, latitude, and time of year, and can be estimated using apps like D Minder.

◐Partially SupportedIt takes a significant amount of time in sunlight for most people to produce 2,000-5,000 IUs of vitamin D.

?Limited ResearchThere are lingering questions about whether supplementing with vitamin D is equivalent to obtaining it from sun exposure.