Health Experts Warn of Rising Safety Risks in ‘Once-Daily’ Sunscreen Formulas
The Truth About ‘Once-a-Day’ Sunscreens: Do They Really Last All Day?
Reapplying sunscreen is a hassle many vacationers dread, leading some to opt for “once-a-day” formulas. But do these products truly offer lasting protection? Experts from consumer group Which? say no—and their investigation reveals crucial caveats hidden in the fine print.
Key Problems with ‘All-Day’ Claims
Which? tested four popular once-a-day sunscreens, finding that most require reapplication after swimming, sweating, or towel-drying. Dermatologists stress that no sunscreen is foolproof for hours, as imperfect application and environmental factors reduce effectiveness.
Even “once-a-day” sunscreens need reapplication in real-world conditions.
1. Boots Soltan Once Advanced 8 Hour Protect (£13 for 200ml)
The lotion and spray promise “8 hours of protection,” but small print advises reapplying after swimming, towel-drying, or contact with abrasive surfaces. Priced at £13, it’s double the cost of Boots’ standard range.
Small Print Alert: Apply 15 minutes before sun exposure and reapply after activities.
2. Boots Soltan Kids Once Protect & Play/Swim (£13 for 200ml)
Marketed for children, these claim eight-hour protection but carry similar disclaimers. Boots clarified that abrasive surfaces include towels or sand, meaning post-swim or playtime reapplication is essential.
Parents should reapply even with “long-lasting” claims.
3. Calypso Once a Day (£10.99 for 200ml)
Calypso’s “all day long” slogan conflicts with website guidance: reapply after 40 minutes in water or skin-rubbing activities.
Takeaway: Don’t trust the bottle’s front label—check online for updates.
4. Calypso All School Day Long (£9.99 for 150ml)
This eight-hour formula warns it can wash off during swimming or towel use. Instructions stress applying to clean, dry skin 15 minutes before sun exposure.
Expert Advice: Reapply, Reapply, Reapply
Professor Brian Diffey of the British Association of Dermatologists warns against relying on all-day claims:
- Missed spots: No one applies sunscreen perfectly.
- Under-application: Use a teaspoon per body part.
- Activity risks: Water, sweat, and friction degrade protection.
Sun Safety Checklist
To stay safe:
✔️ Reapply every 2 hours or post-swim/sweat.
✔️ Seek shade between 11am–3pm.
✔️ Use SPF 30+, protective clothing, and hats.
✔️ Check moles/skin changes regularly.
Bottom line: No sunscreen lasts all day. Reapplication is non-negotiable for true protection.
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